COMMERCIAL ENGINE
BULLETIN
EXPORT CONTROLLED
GEARBOX -- SPARE ACCESSORY DRIVE GEAR
(VACUUM/HYDRAULIC PUMP) REMOVE
1.
PLANNING INFORMATION
A.
Effectivity
(1) Engines
(a) All Rolls-Royce M2509 --C20R that were modified to add the spare drive gear per
IB--4006.
(b) All Rolls-Royce M250--C20 and --C20B series engines and power and accessory
gearboxes prior to:
Model No.
Engine S/N
Gearbox S/N
M250--C20
CAE 823568
CAG 34583
M250--C20B
CAE 832105
CAG 35239
NOTE:
The engine serial numbers above are based on current production records.
(2) Spares -- Not affected
B.
Reason
The Spare Accessory Drive (Vacuum/Hydraulic Pump) is considered redundant if the drive is
not used on the Power and Accessory Gearboxes (6894171, 6886442, 6898571, 6877180 and
6875492).
C.
Description
The Spare Accessory Drive Gearshaft Assembly (6854852), its associated idler gear and
bearings, shaft seal, bearing cage and retaining pin and other detail parts of the installation, can
be removed from the gearbox cover assembly at customer option.
D.
Approval
Technical aspects are FAA approved.
E.
Compliance
Compliance Code 7: To be complied with per customer option.
F.
Interchangeability
Not affected, except where the users special application requires installation of the spare
accessory drive gear.
NOTE:
Installation of parts to activate the spare accessory drive is defined in M250--C20
Series Installation Bulletin 1012.
G. Material Availability -- Not applicable
February 1, 1980
Revision 5
November 21, 2011
M250--C20 Series
CEB --1165
.2011 Rolls--Royce Corporation
Rolls-Royce Proprietary Data Uncontrolled Printed Copy
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EXPORT CONTROLLED
COMMERCIAL ENGINE BULLETIN
H.
Tooling -- Not applicable
I.
Weight and Balance
Engine weight will decrease by 0.679 lbs. (X.XX Kgs) at engine station X.XX in. (XXX mm)
when you incorporate this bulletin.
J.
Electrical Load Data -- Not affected
K.
References
(1) Advance Engineering Memorandum (AEM), CW 2558
(2) Advance Engineering Memorandum (AEM), CW 5429
(3) Advance Engineering Memorandum (AEM), CW 5452
NOTE:
The document above is referenced for the internal use of Rolls-Royce only.
(4) Installation Bulletin 1012.
L.
Other Publications Affected -- None
M. Prerequisites -- None
2.
ACCOMPLISHMENT INSTRUCTIONS
A.
Remove the Spare accessory Drive Gear.
NOTE:
During disassembly comply with appropriate removal, disassembly, cleaning,
inspection, removal of coating, plating, assembly and installation procedures (Ref
O/H).
REF. FIG. 1
REF. FIG. 2
REF. FIG. 3
(1) Separate the engine compressor, gearbox and turbine modules.
(2) Disassemble the gearbox (Ref. O/H, OMM).
(3) Delete Spare Accessory Drive Gear (Vacuum/Hydraulic Pump) from Power and Accessory
Gearbox (6894171, 6886442, 6898571, 6877180 or 6875492) (Ref. Fig. 1 and 2).
(4) Do not install the following parts comprising the spare accessory drive gear installation
during assembly at overhaul or in the field when access to the interior of power and
accessory gearbox has been achieved.
Part No.
Nomenclature
Qty
AN104620
Bolt, No. 10--32 x 1.250 lg.
MS16625--4112
Ring, Retaining Internal
6810421
Washer, Key
6820291
Ring, Retaining, Internal
6820586
Shaft, Support Idler Gear
6820588
Washer, Keyway Brg. Retaining
6824964
Spacer, Sleeve Gearshaft Brg.
February 1, 1980
Revision 5
November 21, 2011
M250--C20 Series
CEB --1165
.2011 Rolls--Royce Corporation
Rolls-Royce Proprietary Data Uncontrolled Printed Copy
Page 2 of 7
Rolls-Royce
EXPORT CONTROLLED
COMMERCIAL ENGINE BULLETIN
6824977
Gear, Spur
6840109
Retainer, Bearing
6840380--98
Ring, Retaining
6854424
Seal, Plain Encased
6854852
Gearshaft Assy.
6823977
Plug
6859431
Bearing, Ball Annular
6859432
Bearing, Ball Annular
CAUTION:
B.
BECAUSE OF THE COMPLEX MACHINING NECESSARY TO REMOVE THE
RETAINING PIN AND BEARING CAGE, THE STEPS THAT FOLLOW MUST BE
DONE AT A ROLLS-ROYCE AUTHORIZED OVERHAUL/REPAIR FACILITY.
DAMAGE TO THE PART CAN OCCUR.
Remove bearing cage, its retaining pin and the spring pin (MS9047--065) at the gearbox cover
assembly spare accessory drive pad. (Ref. Fig. 3).
(1) Do step 2. B. at the same time with step 2. A. If an older version of CEB 1165 was
completed and the bearing cage and its associated parts was not removed, then do step
2.B. at the next time the gearbox is opened.
(2) Do a 200 hour inspection, on the engines with the bearing cage still installed, for a loose
bearing case or retaining pin. If the bearing cage or the retaining pin is loose than do step
2.B. immediately.
Part No.
Nomenclature
Qty.
6843363
Bearing Cage
MS9486--01
Pin
MS9047--065
Spring Pin
C.
Reidentify the part.
(1) Use the vibro--peen and method 2D1 or 2E (Ref. 70--01--05, EMM) to write the CEB
number (CEB 1165) directly below the Gearbox Cover Assembly Part No. Paint
vibro--peened area per AMS 2510 using AMS 2475 treatment.
(2) If service reidentifying the power and accessory gearbox cover assembly, use the
vibro--peen and method 2Dl or 2E (Ref. 70--01--85, EMM) to write a line through previous
part number, write the new part number adjacent to previous number, and write the CEB
number (CEB 1165) directly below the new Gearbox Cover Assembly Part Number. Paint
vibro--peened area per AMS 2510 using AMS 2475 treatment.
D.
Comply with power and accessory gearbox assembly and test procedures (Ref. OMM).
E.
Record compliance with this commercial engine bulletin in the applicable section of the engine
logbook, gearbox assembly, Part III, Modification Record as applicable with the following:
M250--C20, --C20B Series
F.
CEB 1165
Basis for quantities is per gearbox assembly.
February 1, 1980
Revision 5
November 21, 2011
M250--C20 Series
CEB --1165
.2011 Rolls--Royce Corporation
Rolls-Royce Proprietary Data Uncontrolled Printed Copy
Page 3 of 7
EXPORT CONTROLLED
Rolls-Royce
COMMERCIAL ENGINE BULLETIN
Gearbox, Spare Accessory Drive Gear (Vacuum/Hydraulic Pump) Remove
FIG. 1
February 1, 1980
Revision 5
November 21, 2011
M250--C20 Series
CEB --1165
.2011 Rolls--Royce Corporation
Rolls-Royce Proprietary Data Uncontrolled Printed Copy
Page 4 of 7
EXPORT CONTROLLED
Rolls-Royce
COMMERCIAL ENGINE BULLETIN
Gearbox, Spare Accessory Drive Gear (Vacuum/Hydraulic Pump) Remove
FIG. 2
February 1, 1980
Revision 5
November 21, 2011
M250--C20 Series
CEB --1165
.2011 Rolls--Royce Corporation
Rolls-Royce Proprietary Data Uncontrolled Printed Copy
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EXPORT CONTROLLED
Rolls-Royce
COMMERCIAL ENGINE BULLETIN
Must be Removed When Parts Listed in Fig. 2 are removed.
Gearbox, Spare Accessory Drive Gear Components
FIG. 3
February 1, 1980
Revision 5
November 21, 2011
M250--C20 Series
CEB --1165
.2011 Rolls--Royce Corporation
Rolls-Royce Proprietary Data Uncontrolled Printed Copy
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Rolls-Royce
EXPORT CONTROLLED
COMMERCIAL ENGINE BULLETIN
3.
MATERIAL INFORMATION
A.
Configuration Chart
6894171
QTY/
ENG
1
Gearbox Assy (--C20B)
6886442
Alt
6898571
6877180
6875492
NEW P/N
23057100
6894171
QTY/
ENG
1
INSTRUCTIONS/
DISPOSITION
1
Gearbox Assy (--C20B)
6886442
Alt
Gearbox Assy (--C20)
6898571
Alt
Gearbox Assy (--C20)
6877180
Alt
--
Gearbox Assy (--C20)
6875492
Alt
Alt
Cover Assy, Power &
23032286
Alt
NAME
OLD P/N
Accessory
--
--
E Bolt, No. 10--32 x 1.250 lg
AN104620
--
--
E Ring, Retaining, Internal
MS16625--4112
--
--
E Washer, Key
6810421
--
--
E Ring, Retaining, Internal
6820291
--
--
6820586
--
--
6820588
--
--
6824964
--
--
E Shaft, Support
Idler Gear
E Washer, Keyway Brg.
Retaining
E Spacer, Sleeve
Gearshaft Brg.
E Gear, Spur
6824977
--
--
E Retainer, Bearing
6840109
--
--
E Ring, Retaining
6840380--98
--
--
E Seal, Plain Encased
6854424
--
--
E Gearshaft Assy
6854852
--
--
E Plug
6823977
--
--
E Bearing, Ball Annular
6859431
--
--
E Bearing, Ball Annular
6859432
--
--
E Pin, Spring
MS9047--065
--
--
E Pin, Retaining
MS9486--01
--
--
E Cage, Bearing
6843363
INSTRUCTIONS/DISPOSITION NOTES
1. Modify at customers discretion.
2. Remove and if serviceable, return to stores for possible reuse in other location.
3. Scrap.
CUSTOMER SUPPORT
ROLLS-ROYCE
February 1, 1980
Revision 5
November 21, 2011
M250--C20 Series
CEB --1165
.2011 Rolls--Royce Corporation
Rolls-Royce Proprietary Data Uncontrolled Printed Copy
Page 7 of 7
