ALERT

EXPORT CONTROLLED COMMERCIAL ENGINE

BULLETIN

ENGINE, FUEL AND CONTROL – HONEYWELL FUEL CONTROL UNIT

AND POWER TURBINE GOVERNOR – INTERNAL SPRING
REPLACEMENT
1. PLANNING INFORMATION:

A. Effectivity
All Rolls-Royce Model 250–C18, –C20, –C28, –C30 (including –C30R and –C30R/1), –C20R ,
–B15, –B17 and –B17F Series engines are affected by this Bulletin.
B. Reason
Some Honeywell Fuel Control Unit (FCU)/Main Fuel Control (MFC) and Power Turbine
Governor (PTG) Assemblies, new or overhauled since June or September 1996 (see
Compliance section for details), may contain springs that have manufacturing damage that
will, if spring failure occurs, result in an immediate engine deceleration.
C. Description
This Bulletin transmits Honeywell Service Bulletin No. GT–298 and replaces the Fuel Control
Assembly and Power Turbine Governor Assembly with modified assemblies identified with an
“H” in the LI block on the data tag or an “H” after the serial number for U.S. Military units.
D. Approval
Technical aspects are FAA approved.

E. Compliance
Compliance Code 1: All Honeywell Fuel Control Units (FCU) and Power Turbine
Governors (PTG) for the 250–C18 and –B15 (Series I) or 250–C20,
–C20R, –B17 and –B17F (Series II), new, repaired or overhauled
since June 1,1996, and 250–C28 (Series III) or 250–C30 (including
–C30R and –C30R/1) (Series IV), new, repaired or overhauled since
September 1, 1996 and not installed, must be complied with before
further flight.
Compliance Code 2: 250 Series I and II FCUs, overhauled, repaired or new since June 1,
1996 and installed on single engine applications, must be complied
with within the next 150 operating hours following receipt of this
bulletin, but in no case later than October 31, 1999.

Compliance Code 2: 250 Series III and IV (including 250–C30R and –C30R/1) FCUs
overhauled, repaired or new since September 1, 1996 and installed or
single engine applications, must be complied with within the next 300
operating hours following receipt of this bulletin, but in no case later
than October 31, 1999.

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 1 of 10

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COMMERCIAL ENGINE BULLETIN
Compliance Code 3: 250 Series Honeywell FCUs, new, repaired or overhauled since June
1, 1996 for 250 Series I and II engines or since September 1, 1996 for
250 Series III and IV engines and installed on multi–engine
applications, must be complied with the next time the component is
sent to an authorized fuel system repair/overhaul facility for any
reason.
Compliance Code 3: 250 Series Honeywell PTGs, new, repaired or overhauled since June
1, 1996 and installed on any 250 Series engine, must be complied with
the next time the component is sent to an authorized fuel system
repair/overhaul facility for any reason.
NOTE: The fuel control system component manufacturer, Honeywell, determined the
above stated compliance schedule. Inquiries as to the administration, support
or compliance with this Bulletin must be directed to Honeywell Customer
Support, South Bend, Indiana; Phone: (219) 231–4067; FAX: (219) 231–4016
or (219) 231–4072.
NOTE: To make sure of minimal adverse affect on scheduled operation, operators should
coordinate with an authorized Honeywell facility (see the list of designated facilities
on pages 6 and 7), or an otherwise approved facility, to coincide with the next
scheduled maintenance interval.
NOTE: Any FCU or PTG returned to a facility for compliance with this CEB must note any
operational deficiencies to the facility when scheduling, and boldly note the operating
problem on documents provided with the unit sent for bulletin compliance. A full
evaluation of the subject unit will not be made as part of this campaign unless
operational problems are stated by the operator.
F. Interchangeability – Not affected.

G. Material Availability
All 250 Series FCUs and PTGs manufactured by Honeywell of any part numbered
configuration which were new, repaired or overhauled in the time frame stated in the
Compliance Section (paragraph 1.E.) of this CEB are affected.
H. Tooling – Not applicable.

I. Weight and Balance – Not affected.

J. Electrical Load Data – Not affected.

K. References
(1) 5W2 Operation and Maintenance Manual, Turboshaft Models 250–C18A, –C18B, –C18C
(OMM).
(2) 5W4 Illustrated Parts Catalog, Turboshaft Models 250–C18A, –C18B, –C18C (IPC).
(3) 10W2 Operation and Maintenance Manual, Turboshaft Models 250–C20, –C20B, –C20F,
–C20J (OMM).
(4) 10W2S Operation and Maintenance Manual, Turboshaft Model 250–C20S (OMM).
(5) 10W4 Illustrated Parts Catalog, Turboshaft Models 250–C20, –C20B, –C20F, –C20J
(IPC).

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 2 of 10

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(6) 10W4S Illustrated Parts Catalog, Turboshaft Model 250–C20S (IPC).
(7) 16W2 Operation and Maintenance Manual, Turboshaft Models 250–C28B, –C28C
(OMM).
(8) 16W4 Illustrated Parts Catalog, Turboshaft Models 250–C28B, –C28C (IPC).
(9) 14W2 Operation and Maintenance Manual, Turboshaft Model 250–C30, –C30S, –C30G,
–C30G/2, –C30P, –C30M (OMM).
(10) 14W2L, R, U Operation and Maintenance Manual, Turboshaft Models 250–C30L, –C30R,
–C30R/1, –C30U (OMM).
(11) 14W4 Illustrated Parts Catalog, Turboshaft Models 250–C30, C30P, C30M, –C30S,
–C30G, –C30G/2 (IPC).
(12) 14W4R,U Illustrated Parts Catalog, Turboshaft Models 250–C30R, –C30R/1, –C30U
(IPC).
(13) CSP 21003 Operation and Maintenance Manual, Turboshaft 250–C30R/3 (OMM).
(14) CSP 23003 Illustrated Parts Catalog, Turboshaft Model 250–C30R/3 (IPC).
(15) GTP 5232–2 Operation and Maintenance Manual, Turboshaft Models 250–C20R,
C20R/1, C20R/2 and C20R/4 (OMM).
(16) GTP 5232–4 Illustrated Parts Catalog, Turboshaft Models 250–C20R, –C20R/1,
–C20R/2, –C20R/4 (IPC).
(17) 6W2 Operation and Maintenance Manual, Turboprop Model 250–B15G (OMM).
(18) 6W4 Illustrated Parts Catalog, Turboprop Model 250–B15G (IPC).
(19) 11W2 Operation and Maintenance Manual, Turboprop Models 250–B17, –B17B, –B17C,
–B17D, –B17E (OMM).
(20) 11W4 Illustrated Parts Catalog, Turboprop Models 250–B17, –B17B, –B17C, –B17D,
–B17E (IPC).
(21) GTP 5243–2 Operation and Maintenance Manual, Turboprop Models 250–B17F,
–B17F/1, –B17F/2 (OMM).
(22) GTP 5243–4 Illustrated Parts Catalog, Turboprop Models 250–B17F, –B17F/1, –B17F/2
(IPC).

L. Other Publications Affected – None.

M. Prerequisites – None.

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 3 of 10

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COMMERCIAL ENGINE BULLETIN
2. ACCOMPLISHMENT INSTRUCTIONS:
A. Replace the Fuel Control Assembly.
(1) Remove the fuel control assembly from the gearbox and send it to a Honeywell
authorized maintenance facility for replacement of governor and speed bias springs (Ref
OMM).
(2) Install a modified fuel control assembly (same part number as the one removed, but
identified with an “H” in the LI block on the data tag) on the gearbox (Ref. OMM) (REF:
Paragraph 1.H.)
NOTE: Install seals and caps before shipping (Ref. OMM, O/H).
NOTE: Refer to Figures 1 and 2 for fittings NOT to be removed. Some airframe
manufacturers utilize FCU lever arms of their own manufacture. Refer to airframe
manuals for these applications. Retain airframe unique items and advise the fuel
system facility not to supply replacement items.
NOTE: To make sure of speedy processing of affected units, include Time Since New/Time
Since Overhauled and other service history.
NOTE: Some fuel control assemblies and power turbine governor assemblies contain
springs inspected to the FAA approved criteria prior to the issuance of this CEB.
These units are identified with the letter “H” in the LI block of the fuel control
assembly or power turbine governor Assembly data tag and already meet the criteria
of this CEB, but will not show compliance with this CEB in the log cards. These
units identified with the letter “H” may continue in service. Make the proper log entry
per paragraph C below.
NOTE: FCUs will be returned with all field settings to nominal position (the same as a new
or overhauled unit). correct settings and adjustments (Ref. OMM, O/H).
B. Replace the Power Turbine Governor Assembly.
(1) Remove the power turbine governor assembly from the gearbox and send it to a
Rolls-Royce authorized maintenance facility for replacement of the governor springs (Ref.
OMM).
NOTE: Install seals and caps before shipping (Ref. OMM, O/H).
NOTE: Refer to Figures 1 and 2 for fittings NOT to be removed. Some airframe
manufacturers utilize FCU lever arms of their own manufacture. Refer to airframe
manuals for these applications. Retain airframe unique items and advise the fuel
system facility not to supply replacement items.
NOTE: To make sure of speedy processing of affected units, include Time Since New/Time
Since Overhauled and other service history.
(2) Install a modified power turbine governor assembly (same part number as the one
removed but identified with an “H” in the LI block on the data tag) on the gearbox (Ref.
OMM, O/H) (Ref. Paragraph 1.H.)

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 4 of 10

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EXPORT CONTROLLED Rolls–Royce
COMMERCIAL ENGINE BULLETIN
NOTE: Some fuel control assemblies and power turbine governor assemblies contain
springs inspected to the FAA approved criteria prior to the issuance of this CEB.
These units are identified with the letter “H” in the LI block of the Fuel Control
Assembly or Power Turbine Governor Assembly data tag and already meet the
criteria of this CEB, but will not show compliance with this CEB in the log cards.
These units identified with the letter “H” may continue in service. Make the proper
log entry per paragraph C below.

C. Record compliance in the Engine Log Book, Engine Assembly (white pages) and Accessory
Assembly (Beige pages), Part III, Modification Record, as applicable with the following:

250–C18 Series CEB A–300

250–C20 Series CEB A–1361
250–C28 Series CEB A–73–2069
250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027.

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 5 of 10

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EXPORT CONTROLLED Rolls–Royce
COMMERCIAL ENGINE BULLETIN

AUTHORIZED HONEYWELL AND ROLLS–ROYCE FACILITIES

ACRO Aerospace Inc. Aeromaritime
4551 Agar Drive, 7 Industrial Estate,
Richmond, British Columbia, Canada V7B Hal Far BBG 06, Malta
1A4 Contact: Ing. Charles Xuereb
Contact: Rob Nichols Phone: 356–651–778
Phone: (604) 276–7684 E–mail: aeromar@keyworld.net
E–mail: rnichols@acro.ca
Agusta Dallas Airmotive, Inc.
03100 Frosinone (FR) 6114 Forest Park Road
VIA Giovanni Agusta 1, Italy Dallas, Texas 75235–6498
Contact: Giovanni Faia Contact: Edith Williams
Phone: 39–0775–205324 Phone: (214) 956–3015
E–mail: g.faia@agusta.it E–mail: dallasairmotive@worldnet.att.net
Goodrich Control Systems Australia Goodrich Control Systems GmbH – Germany
84–92 Epsom Road Bataverstr. 80,
Zetland NSW 2017, Australia D–41462 Neuss
Contact: Richard Baughan Neuss, Germany
Phone: 612–9315–3700 Contact: Ewald Schulz
E–mail: Phone: 49 (0) 2131 953 362
E–mail: ewald.schulz@goodrich.com
Honeywell (Prince Edward Island) H + S Aviation
P. O. Box 194 Airport Service Road
Slemon Park Portsmouth Hampshire
PE, Canada PO3 5PJ, England
Contact: Larry Wilson Contact: Lee Holloway
Phone: (902) 888–5158 Phone: 44(0)23–9230–4256
E–mail: lawrence.wilson@honeywell.com E–mail: lee_holloway@hsaviation.co.uk
Industria de Turbu Propulsores, S.A. Rolls–Royce Engine Services – Oakland Inc.
Travesia Costa Brava, 6 7200 Earhart Road
28034 Madrid, Spain Oakland, California 94621–4504
Contact: Ignacia De Pinedo Contact: Greg Tillson
Phone: 34–91–384–8008 Phone: (510) 613–1000 x1304
E–mail: ignacio.depinedo@itp.es E–mail: gtillson@rolls–royceeso.com

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 6 of 10

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AUTHORIZED HONEYWELL AND ROLLS–ROYCE FACILITIES
Rolls–Royce Brasil Standard Aero – Winnipeg
Rua Dr. Cincinato Brago 47 33 Allen Dyne Road
Sao Bernado do Campo Winnipeg, Manitoba, Canada R3H 1A1
Sao Paulo, Brasil CEP 09890–900 Contact: Rod S. Boresky
Contact: Aroldo Rovero Phone: (204) 775–9711
Phone: 5511–4390–4861 E–mail: rod_boresky@standardaero.ca
E–mail: arovero@rolls–royce.com.br
Standard Aero – Australia Standard Aero – Singapore
61A Marple Avenue 48A Loyang Way
Villawood NSW 2163, Australia Singapore 508741
Contact: Paul Gatt Contact: Raymond Ng C. H.
Phone: 612–9724–1883 Phone: 65–542–4711
E–mail: paul_gatt@standardaero.ca E–mail:

NOTE: There are additional Honeywell Authorized Warranty/Repair Stations who are not
Rolls–Royce Authorized Factilities and a list of these facilities can be obtained
directly from Honeywell.

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 7 of 10

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Typical Series II FCU and PTG Fittings NOT to be Removed (Indicated with an Arrow)
Figure 1

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 8 of 10

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Typical Series IV FCU and PTG Fittings NOT to be Removed (Indicated with an Arrow)
Figure 2

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 9 of 10

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3. MATERIAL INFORMATION:

All 250 Series FCUs and PTGs manufactured by Honeywell of any part numbered configuration
which were new, repaired or overhauled in the time frame stated in the Compliance Section
(paragraph 1.E.) of this CEB are affected.

CUSTOMER SERVICES
ROLLS–ROYCE

October 5, 1998 250–C18 Series CEB A–300

250–C20 Series CEB A–1361
Revision 3
250–C28 Series CEB A–73–2069
August 13, 2004 250–C30 Series CEB A–73–3102
250–C20R Series CEB A–73–4045
250–B15 Series TP CEB A–172
250–B17 Series TP CEB A–1312
250–B17F Series TP CEB A–73–2027 Page 10 of 10

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 Engines, Systems & Services
Service Bulletin
SUBJECT: THE REPLACEMENT OF GOVERNOR AND SPEED BIAS SPRINGS IN
HONEYWELL MAIN ENGINE FUEL CONTROL UNITS USED ON ALL
ROLLS-ROYCE 250 SERIES ENGINES. THE REPLACEMENT OF
GOVERNOR SPRINGS IN HONEYWELL POWER TURBINE
GOVERNORS USED ON ALL ROLLS-ROYCE 250 SERIES ENGINES.

1. Transmittal Section

% A. This section transmits Revision 3 to Service Bulletin GT-298 originally issued

% October 5, 1998, with Revision 1 dated March 15, 1999, and Revision 2 dated
% July 17, 2001.
%
% B. Revision 3 to Service Bulletin GT-298 revises the Interchangeability or
% Intermixability of Parts section, revising the disposition of old stock.

2. Planning Information

A. Effectivity

(1) Main Fuel Control (MFC) units manufactured between May 31, 1996 and
January 16, 1999, with the following BR serial numbers:

BR50879 BR55136 BR55753 BR57080

BR53187 BR55331 BR55756 thru BR55759 BR57230

BR53294 BR55587 BR55762 BR57255

BR53614 BR55673 BR55764 BR57320 thru BR57782

BR53625 BR55674 BR56172 BR57792 thru BR57795

BR53726 BR55678 BR56508 BR57836

BR54157 BR55680 BR56515 BR57816

BR54729 BR55681 BR56995 thru BR56997 BR57827

BR55110 BR55752 BR57013 BR57828

BR57830 BR57837 BR57838 BR57839

BR57844 BR57850 BR57852 BR57853

(2) All Main Fuel Controls for Series I or II that were overhauled or repaired
between May 31, 1996 and August 16, 1998, and had new springs installed
with packaging dates between May 31, 1996 and August 16, 1998.

Original Date: October 5, 1998 GT-298

Revision 3: August 13, 2004 Page 1 of 14
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Service Bulletin
2. Planning Information (Continued)

A. (3) All Main Fuel Controls for Series III or IV that were overhauled or repaired
between August 31, 1996 and August 16, 1998, and had new springs
installed with packaging dates between August 31, 1996 and
August 16, 1998.

(4) Power Turbine Governor (PTG) units manufactured between May 31, 1996
and August 16, 1998, with the following BR serial numbers:

BR14199 BR41435 BR41712 BR41794

BR33597 BR41523 BR41715 BR41841

BR40826 BR41661 BR41743 BR41865

BR40848 BR41701 BR41781 BR41869

BR41251 BR41711 BR41788 thru BR41790 BR41883 thru BR42387

(5) All Power Turbine Governors for Series I or II that were overhauled or
repaired between May 31, 1996 and August 16, 1998, and had new springs
installed with packaging dates between May 31, 1996 and August 16, 1998.

(6) All Power Turbine Governors for Series III or IV that were overhauled or
repaired between August 31, 1996 and August 16, 1998, and had new
springs installed with packaging dates between August 31, 1996 and
August 16, 1998.

(7) Any commercial MFC or PTG identified with the letter H on the far right side
of the less issue (LI) pad of the identification plate, or any military MFC or
PTG identified with the letter H on the far right side of the serial number (SN)
pad are in compliance with this Service Bulletin.

B. Concurrent Requirements

All previously released mandatory Service Bulletins affecting Rolls-Royce 250

series MFC’s and PTG’s.

C. Reason

Some Honeywell (Bendix) Main Fuel Control (MFC) units and Power Turbine
Governor (PTG) assemblies, new, repaired, or overhauled since June or
September 1996 (refer to Compliance for details), may contain springs that have
manufacturing damage that will, if spring failure occurs, result in an immediate
engine deceleration.

Original Date: October 5, 1998 GT-298

Revision 3: August 13, 2004 Page 2 of 14
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 Engines, Systems & Services
Service Bulletin
2. Planning Information (Continued)

D. Description

This Service Bulletin provides instructions for replacement of all governor and
speed bias springs in affected units.

E. Compliance

Effected MFC’s and PTG’s must comply with the requirements of this Service
Bulletin, along with Rolls-Royce CEB compliance requirements, the next time the
affected unit is at a repair/overhaul facility for any reason.

F. Approval

Technical aspects are FAA approved.

G. Manpower

(1) No additional manhours required if performed at time of overhaul.

(2) Three additional manhours required for replacement of spring and

calibration of MFC if accomplished at time other than overhaul when
removed to comply with this Service Bulletin/CEB.

(3) One and one-half additional manhours required for replacement of spring
and calibration of PTG if accomplished at time other than overhaul when
removed to comply with this Service Bulletin/CEB.

H. Weight and Balance

Not affected.

I. Electrical Load Data

None.

J. References

(1) Model DP-D3 MFC Component Maintenance Manual (CMM)/IPL,

Engines & Systems Form No. 15-426D, ATA No. 73-20-01, issue date
September 17, 1999.

(2) Model DP-M1 MFC Overhaul/IPL, Engines & Systems Form No. 15-495A,
issue date July 30, 1973.

Original Date: October 5, 1998 GT-298

Revision 3: August 13, 2004 Page 3 of 14
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2. Planning Information (Continued)

J. (3) Model DP-N2 MFC CMM/IPL, Engines & Systems Form No. 15-870B,
ATA No. 73-20-10, issue date January 26, 2001.

(4) Model DP-N2 MFC CMM/IPL, Engines & Systems Form No. 15-602E,
ATA No. 73-20-21, issue date April 16, 2001.

(5) Model DP-P2 MFC CMM/IPL, Engines & Systems Form No. 15-848,
ATA No. 73-20-15, issue date March 17, 2000.

(6) Model DP-P2 MFC CMM/IPL, Engines & Systems Form No. 15-966,
ATA No. 73-20-02, issue date March 17, 2000.

(7) Model DP-V1 MFC CMM/IPL, Engines & Systems Form No. 15-673C,
ATA No. 73-20-02, issue date July 1, 1997.

(8) Model DP-T3 MFC CMM/IPL, Engines & Systems Form No. 15-661E,
ATA No. 73-20-11, issue date October 20, 2000.

(9) Model DP-V3 MFC CMM/IPL, Engines & Systems Form No. 15-805B,
ATA No. 73-20-03, issue date April 15, 1997.

(10) Model AL-AA1 PTG CMM/IPL, Engines & Systems Form No. 15-1095A,
ATA No. 73-20-25, issue date August 7, 2000.

(11) Model AL-AC1 PTG CMM/IPL, Engines & Systems Form No.15-662C,
ATA 73-20-07, issue date July 16, 2001.

(12) Model AL-AD1 PTG CMM/IPL, Engines & Systems Form No. 15-1001A,
ATA 73-20-09, issue date September 4, 2001.

(13) Model AL-L3 PTG CMM/IPL, Engines & Systems Form No. 15-1096,
ATA No. 73-20-01, issue date May 1, 1997.

K. Other Publications Affected

None.

L. Interchangeability or Intermixability of Parts

New springs will have a revision letter change to their part number on the
% packaging. Do not mix old and new stock. Refer to Tables 2 and 3 for new
% spring part number (PN) and revision letter. Any springs in stock with revision
% letters prior to the new spring PN and revision letter are not to be installed, but
% returned to your supplier for replacement. Suppliers shall return parts to
% Honeywell for replacement to the location listed in paragraph 3.A.(2) below.

Original Date: October 5, 1998 GT-298

Revision 3: August 13, 2004 Page 4 of 14
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Service Bulletin
3. Material Information

A. Material - Price and Availability

(1) Affected springs will be replaced under warranty under the conditions as
shown in Table 1.

Table 1
Warranty Conditions

Unit Condition Warranty Level

Unit in repair facility for overhaul. None. Springs are 100% replaceable.

Unit in for repair that had been overhauled or Spring provided at no cost.
manufactured from June, 1996 to August 15, 1998.

Series I and II units in for check and test that had Spring at no cost and labor provided per
been overhauled or manufactured as of June 1996, paragraphs 2.G.(2) and (3).
along with Rolls-Royce CEB time compliance.

Series III and IV units in for check and test that had Spring at no cost and labor provided per
been overhauled or manufactured as of September paragraphs 2.G.(2) and (3).
1996, along with Rolls-Royce CEB time compliance.

NOTE: This Service Bulletin, and the warranty cost connected with it, is
warranted by Honeywell and covers only the spring replacement and
calibration requirements per this Service Bulletin/CEB. Warranty work or
repairs performed in excess of the requirements of this Service
Bulletin/CEB is not covered under this warranty condition.

(2) Honeywell Authorized Warranty and Repair Stations (AWARS) will submit
claims for the customer. Repair stations should submit warranty claim with
% removed spring and tagged with information listed in steps (2)(a)1 through 6
below to:

Honeywell
Engines, Systems & Services
Warranty Administration
3475 N. Wesleyan Blvd.
Rocky Mount, NC 27804

NOTE: Refer all warranty questions to the Warranty Claims Administrator,

% telephone number (252) 985-7160, or fax number (252) 972-6660.

NOTE: Failure to comply with these requirements may delay warranty

adjustments.

Original Date: October 5, 1998 GT-298

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3. Material Information (Continued)

A. (2) (a) Tag returning spring with the following information:

1 Aircraft Type

2 Aircraft Serial Number

3 Engine Model and Serial Number

4 MFC or PTG Control Serial Number and Honeywell Part Number

5 Time Since New (TSN) and Time Since Overhaul (TSO)

6 Name and Address of Customer

(3) All warranty claims must be filed within thirty (30) days of the work.

(4) Table 2 lists affected MFC spring part numbers and their replacement part
numbers.

(5) Table 3 lists affected PTG spring part numbers and their replacement part
numbers.

Original Date: October 5, 1998 GT-298

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3. Material Information (Continued)

Table 2
Main Fuel Control Spring Identification

Old Spring
Model Type of Spring Part Number New Spring Part Number
Governor 2529454 or 2538427 2529454 Rev. F or 2538427 Rev. H
DP-D3
Speed Bias 2523824 2523824 Rev. K
Governor 2529454 2529454 Rev. F
DP-M1
Speed Bias 2523824 2523824 Rev. K
DP-N2 (C20) Governor 2538427 2538427 Rev. H
Speed Bias 2542244 or 2537669 2542244 Rev. D or 2537669 Rev. E
Governor 2538427 2538427 Rev. H
DP-N2 (C20R)
Speed Bias 2542553 2542553 Rev. C
DP-P1/P2 Governor 2538427 2538427 Rev. H
Speed Bias 2542244 or 2537669 2542244 Rev. D or 2537669 Rev. E
DP-P2 (B-17F) Governor 2538427 2538427 Rev. H
Speed Bias 2542553 2542553 Rev. C
DP-V1 Governor 2539641 2539641 Rev. F
Speed Bias 2542237 2542237 Rev. D
DP-T3 Governor 2539641 2539641 Rev. F
Speed Bias 2542244 OR 2537669 2542244 Rev. D or 2537669 Rev. E
DP-V3 Governor 2539641 2539641 Rev. F
Speed Bias None None

Table 3
Power Turbine Governor Spring Identification

Old Spring New Spring

Model Type of Spring Part Number Part Number

AL-AA1 Governor 2529242 2529242 Rev. H

AL-AA1 Governor 2529153 2529153 Rev. M

AL-AC1 Governor 2538849 or 2540601 2538849 Rev. G or 2540601 Rev. G

AL-AD1 Governor 2540601 2540601 Rev. G

AL-L3 Governor 2529242 2529242 Rev. H

Original Date: October 5, 1998 GT-298

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3. Material Information (Continued)

NOTE: All new springs identified in Tables 2 and 3 with new revision letters will
not require MPI prior to installation. Visual inspection must be completed
as any other part being installed into a serviceable unit.

B. Consumable parts required for MFC compliance with this Service Bulletin are
shown in Table 4 and PTG consumable parts are shown in Table 5.

Table 4
Main Fuel Control Consumables

Nomenclature Part Number Quantity

Cotter Pin MS24665-138 (901214K1) 1

Nut, Self-locking MS21083-N06 1

Packing, Preformed 953508-8 2

Seal, Aluminum 328617 1

Table 5
Power Turbine Governor Consumables

Nomenclature Part Number Quantity

Cotter Pin MS24665-138 1

Nut, Self-locking MS21083-N06 1

Packing, Preformed 2666850-11 1

Packing, Preformed 953508-8 1

Seal, Aluminum 328617 1

C. Reidentified Parts

All affected commercial units, MFC’s and PTG’s, are to be reidentified after
compliance with this Service Bulletin by adding the letter “H” to the far right side of
the “less issue” (LI) pad on the identification plate. All affected military units,
MFC’s and PTG’s, are to be reidentified after compliance with this Service Bulletin
by adding the letter “H” to the far right side of the serial number (SN) pad.

Original Date: October 5, 1998 GT-298

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3. Material Information (Continued)

D. Tooling - Pricing and Availability

No special tooling is required for replacement of the affected springs.

4. Accomplishment Instructions

A. Spring change instructions and test requirements for main fuel controls are as
follows:

(1) If component is at repair facility for spring change only, and no other repair
is being performed or received with a reported problem, replace spring as
directed below and perform final test specification points per Table 6 to
return unit to service.

(2) If component is at repair facility for repair (other than spring change) and/or
overhaul, replace spring as directed in the appropriate CMM and perform
complete final test specification as directed in the appropriate
manual/Service Bulletin.

B. Replacement of affected main fuel control governor and speed bias springs shall
be performed as follows:

(1) Using the appropriate CMM, disassemble the major components to gain
access to the springs.

(a) Protect the main flow body as directed in appropriate CMM.

(2) Remove governor spring by performing the following steps:

(a) Remove safety wire from threaded end of eccentric shaft. Remove nut
and washer from end of eccentric shaft using an Allen wrench.

(b) Note the position of the eccentric shaft and scribe a mark on the body
corresponding with the scribe on the eccentric shaft.

(c) Turn eccentric shaft out and remove it.

(d) Carefully lift cam follower lever up and forward. Remove governor
spring.

Original Date: October 5, 1998 GT-298

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4. Accomplishment Instructions (Continued)

B. (3) Remove speed bias spring by performing the following steps:

(a) Count number of threads visible through the self-locking nut on

adjusting screw for speed bias spring. Note the number.

(b) Remove self-locking nut from the adjusting screw in the speed bias
lever.

(c) Remove speed bias spring.

(4) Install new speed bias and governor springs as follows:

(a) Install new speed bias spring on lever assembly and adjusting screw.

NOTE: Identification of new springs from old springs is difficult. Do

NOT remove new spring from packaging until ready to install.

(b) Install new self-locking nut until the appropriate number of threads are
visible.

(c) Install new governor spring onto cam follower lever assembly.

NOTE: Be certain to replace governor spring with exact same dash

number as the one removed. For example, if removed spring
was -3 spring, replacement spring must also be -3.

NOTE: Identification of new springs from old springs is difficult. Do

NOT remove new spring from packaging until ready to install.

(d) Reinstall cam follower lever assembly into drive body.

(e) Reinstall eccentric shaft. Turn shaft in until it reaches its original
position and scribe mark on end of shaft matches up with the scribed
mark on the body.

(5) Remove cotter pin and vent screen (or plug, if appropriate) from main flow
body.

(6) Assemble main flow body to drive body. Before installing three screws to
secure main body to drive body, view cam of the cam follower to be certain it
is riding properly on the cam of the throttle shaft.

(7) Safety wire eccentric shaft as instructed in appropriate CMM.

Original Date: October 5, 1998 GT-298

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4. Accomplishment Instructions (Continued)

B. (8) Test unit according to criteria in paragraph 4.A. above.

(9) After testing is completed, reinstall screen (or plug, where appropriate) with
new cotter pin.

(10) Reidentify the MFC per paragraph 3.C. above.

C. Replace affected power turbine governor springs as follows:

(1) Using the appropriate CMM, disassemble the major components to gain
access to the spring. Protect the cover assembly as directed.

(2) Remove and replace the governor spring in the following manner:

(a) Note the position of the eccentric shaft and scribe a mark on the body
corresponding with the scribe on the eccentric shaft.

(b) Remove safety wire from threaded end of eccentric shaft.

(c) Turn eccentric shaft out using an Allen wrench and remove it.

(d) Lift cam follower lever assembly up and forward. Remove governor
spring from cam lever assembly and adjusting screw.

(e) Install new spring on adjusting screw and cam lever assembly.

NOTE: Be certain to replace governor spring with exact same spring

number as the one removed. For example, if removed spring
was a -3 spring, replacement spring must also be a -3.

NOTE: Identification of new springs from old springs is difficult. Do

NOT remove new spring from packaging until ready to install.

(f) Reinstall eccentric shaft to original position being certain to match

scribe mark on eccentric shaft with scribe mark on body.

(g) Check to be sure guide post on bearing assembly rides properly in the
slot of the governor lever assembly.

(3) Assemble cover assembly and drive body assembly. Safety wire eccentric
shaft as directed in appropriate CMM.

(4) Recalibrate the PTG as described in the appropriate CMM and/or Service
Bulletin.

Original Date: October 5, 1998 GT-298

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4. Accomplishment Instructions (Continued)

C. (5) Reidentify the PTG per paragraph 3.C. above.

% NOTE: For tracking purposes, Honeywell Fuel Control/Governor Facility

% Report (refer to Appendix A, paragraph 5. below) MUST be
% completed and submitted every 10 days to Honeywell Engines,
% Systems & Services, Attn: Customer and Product Support,
% Dept 4230, 717 N. Bendix Drive, South Bend, IN 46628.

Table 6
Test Points for Abbreviated Flow Sheets

Parts List Test Specification Test Point Paragraphs

Model Number Number To Be Performed

DP-D3 2524527-25 12532 Paragraphs 1, 3, 5, 6. 7, 9, 10, 11, 12, 13, 18

2524909-7 12533 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 13, 18

DP-M1 2524678-14 12530 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 15

DP-N2 2549032-9 12337 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 13, 14, 19

2549013-10 12537 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 13, 15, 20

2549065-5 12526 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 13, 15, 20

2524644-30 12670 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 13, 15, 20

2524911-7 12689 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 13, 15, 19

DP-P2 2524986-8 12525 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 13, 20

2524957-7 12691 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 13, 17

2524654-26 12764 Paragraphs 1, 3, 5, 6, 7, 9, 10, 11, 13, 16

DP-V1 2524944-10 12672 Paragraphs 3, 5, 6, 9, 10, 11, 13, 15, 16, 18, 23

2549092-5 12782 Paragraphs 3, 4, 5, 7, 9, 10, 11, 12, 14, 16, 17, 19,
20, 25

DP-V3 2549058-7 12784 Paragraphs 1, 5, 6, 8, 9, 10, 12, 13, 19

2524886-16 12784 Paragraphs 1, 5, 6, 8, 9, 10, 12, 13, 19

DP-T3 2524738-36 12651 Paragraphs 3, 5, 6, 8, 9, 10, 11, 13, 15, 16, 18, 23

2549093-5 12651 Paragraphs 3, 5, 6, 8, 9, 10, 11, 13, 15, 16, 18, 23

Original Date: October 5, 1998 GT-298

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5. Appendix A

Honeywell Fuel Control/Governor Facility Report

Work Accomplished
Results/Findings/
TSN/TSO
Hours
Number Removal Reason
Serial
Ship Date
Return
Model
Honeywell
PN Out
Honeywell
PN In

Original Date: October 5, 1998 GT-298

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LIMITED DISTRIBUTION TO AUTHORIZED PERSONS ONLY

The information and designs contained in this document are proprietary to Honeywell.

This document is protected under all pertinent domestic and international intellectual
property provisions. Copyright Honeywell U.S.A. 1999, 2001, 2004. All rights reserved.

This publication was prepared and

distributed by:

Honeywell
Engines, Systems & Services
717 N. Bendix Drive
South Bend, IN 46628
Fax: (574) 231-4072

Original Date: October 5, 1998 GT-298

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