ALERT
EXPORT CONTROLLED COMMERCIAL ENGINE
BULLETIN
ENGINE, GEARBOX ASSEMBLY -- INSPECTION AND REWORK OF
GEARBOX HOUSINGS
1. PLANNING INFORMATION
A. Effectivity
(1) Engines
All Rolls--Royce Model 250--C30, --C40 and C47 Series engines listed below are affected
by this bulletin.
GEARBOX HOUSING P/N GEARBOX HOUSING S/N ENGINE S/N
23064603 HL16529 896004
23064603 HL16532 895985
23064603 HL16537 895987
23064603 HL16545 895986
23064603 HL16546 895984
23064603 HL16552 895992
23064603 HL16554 895990
23064603 HL16555 895988
23064603 HL16560 895989
23064603 HL16563 895991
23064603 HL16565 895993
23064603 HL16566 895995
23064603 HL16570 895994
23064603 HL16574 895996
23064603 HL16578 895997
23064603 HL16584 895999
23064603 HL16585 896000
23064603 HL16595 896002
23064603 HL16597 896001
23064603 HL16600 896005
23064603 HL16602 896003
23064640 HL16536 410936
23064640 HL16538 410935
23064640 HL16543 410937
23064640 HL16544 410940
23064640 HL16550 410938
23064640 HL16557 410939
June 30, 2005 250--C30 Series CEB--A--72--3274
250--C40 Series CEB--A--72--5050
250--C47 Series CEB--A--72--6056
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COMMERCIAL ENGINE BULLETIN
23064640 HL16564 410942
23064640 HL16568 410941
23064640 HL16618 410943
23064640 HL16585 410944
23074603 HL16573 895998
23076082 HL16513 847707
23076082 HL16519 847690
23076082 HL16530 847691
23076082 HL16531 847687
23076082 HL16534 847676
23076082 HL16535 847677
23076082 HL16539 847674
23076082 HL16540 847685
23076082 HL16542 847675
23076082 HL16547 847680
23076082 HL16551 847688
23076082 HL16553 847678
23076082 HL16556 847686
23076082 HL16558 847891
23076082 HL16559 847892
23076082 HL16561 847679
23076082 HL16562 847684
23076082 HL16567 847683
23076082 HL16569 847681
23076082 HL16571 847682
23076082 HL16572 847689
23076082 HL16575 847694
23076082 HL16576 847692
23076082 HL16577 847695
23076082 HL16579 847693
23076082 HL16580 847696
23076082 HL16582 847697
23076082 HL16583 847699
23076082 HL16586 847702
23076082 HL16587 847698
23076082 HL16594 847700
23076082 HL16596 847708
23076082 HL16599 847704
June 30, 2005 250--C30 Series CEB--A--72--3274
250--C40 Series CEB--A--72--5050
250--C47 Series CEB--A--72--6056
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EXPORT CONTROLLED Rolls--Royce
COMMERCIAL ENGINE BULLETIN
23076082 HL16601 847701
23076082 HL16604 847706
23076082 HL16605 847716
23076082 HL16608 847703
23076082 HL16609 847705
23076082 HL16611 847710
23076082 HL16612 847714
23076082 HL16613 847711
23076082 HL16614 847712
23076082 HL16615 847713
23076082 HL16617 847717
23076082 HL16621 847715
N/A N/A 844249
(2) Spares -- Not affected
B. Reason
Rolls--Royce has found that some Rolls--Royce Model 250--C30 and --C47 Series gearbox
housings were manufactured with an incompletely drilled and cleaned #6, #7 and #8 bearing oil
passage. The incompletely drilled oil passage can cause a restriction in oil flow and potentially
damage the #8 bearing.
One --C40B turbine was run on a --C47B engine while at Rolls--Royce, so that turbine should be
subjected to Accomplishment Instructions 2.C.(4) -- 2.C.(8).
C. Description
This bulletin contains the procedure to inspect the engines listed above and the action to take
following the inspection.
D. Approval
Technical aspects are FAA approved.
E. Compliance
Compliance Code 2. To be complied with within the next five hours or no later than July 31,
2005, whichever comes first.
F. Interchangeability -- Not affected
G. Material Availability
Non--FADEC
P/N NAME QTY/ENG
23064603 Housing, Gearbox 1
23058131 #8 Bearing 1
FADEC
P/N NAME QTY/ENG
23076082 Housing, Gearbox 1
23058131 #8 Bearing 1
June 30, 2005 250--C30 Series CEB--A--72--3274
250--C40 Series CEB--A--72--5050
250--C47 Series CEB--A--72--6056
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EXPORT CONTROLLED Rolls--Royce
COMMERCIAL ENGINE BULLETIN
H. Tooling -- Not applicable
I. Weight and Balance -- Not affected
J. Electrical Load Data -- Not affected
K. References
(1) 14W2 Operation and Maintenance Manual, Turboshaft Models 250--C30, --C30S, --C30G,
--C30G/2, --C30P, --C30M (OMM).
(2) 14W3 Overhaul Manual, Turboshaft Models 250--C30, --C30S, --C30M, --C30P, --C30G,
--C30G/2, --C30R, --C30U (O/H).
(3) 14W4 Illustrated Parts Catalog, Turboshaft Models 250--C30, --C30P, --C30M, --C30S,
--C30G, --C30G/2 (IPC).
(4) CSP 21003 Operation and Maintenance Manual, Turboshaft Model 250--C30R/3 (OMM).
(5) CSP 23003 Illustrated Parts Catalog, Turboshaft Model 250--C30R/3, --C30R/3M (IPC).
(6) CSP 21006 Operation and Maintenance Manual, Turboshaft Model 250--C30R/3M (OMM).
(7) CSP 21000 Operation and Maintenance Manual, Turboshaft Model 250--C40B (OMM).
(8) CSP 21001 Operation and Maintenance Manual, Turboshaft Model 250--C47B (OMM).
(9) CSP 23001 Illustrated Parts Catalog, Turboshaft Models 250--C40B, --C47B and C47M
(IPC).
(10) CSP 21004 Operation and Maintenance Manual, Turboshaft Model 250--C47M (OMM).
(11) CSP 22001 Overhaul Manual, Turboshaft Models 250--C40B, --C47, --C30R/3 (O/H).
L. Other Publications Affected -- None
M. Prerequisites -- None
2. ACCOMPLISHMENT INSTRUCTIONS
NOTE: When performing the following procedures obey the warnings and cautions to make
sure best practices for personnel safety and health are followed and to prevent
damage (OMM).
A. Inspection of the #6, #7 and #8 bearing oil passage.
(1) Use a borescope (4mm) to inspect for an incompletely drilled oil passage or hanging burrs
left from the drilling process.
(a) The borescope is to be inserted into the gearbox housing at the A/C oil pressure gage
port, marked PRESS, on the right hand side of the engine. The borescope should
then be moved up and to the left (gearbox forward looking aft) (REF. Fig. 1).
(b) With the borescope positioned in the #6, #7 and #8 bearing oil supply passage, the
drill hole should be visible in the aft region of the oil passage.
(c) Determine if the drill hole is not completely drilled through and free of any machining
debris or burrs.
! If the drill hole is not completely drilled through, or if any debris is noted around the
drill hole, then the engine should be removed and sent to a FIRST Network Facility
for repair. The FIRST Network Facility is to follow the instructions in 2.C.
! If the oil supply hole is completely drilled through the housing and properly deburred
then the proceed to 2.B.
June 30, 2005 250--C30 Series CEB--A--72--3274
250--C40 Series CEB--A--72--5050
250--C47 Series CEB--A--72--6056
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EXPORT CONTROLLED Rolls--Royce
COMMERCIAL ENGINE BULLETIN
B. For all gearbox housings that were found to have a clean drill hole, properly drilled and
deburred , do the following:
(1) Inspect all oil delivery lines to the #6, #7 and #8 bearing, the check valve, and the #6 and
#7 bearing oil screen.
(2) Do the procedure for Cleaning of Power Turbine Support Scavenge and Pressure Oil
System Components (REF. OMM).
(3) If all lines are found to be free of debris , the engine may be returned to service.
(4) If debris is found in the oil system, the engine should be removed and sent to a FIRST
Network Facility for repair. The FIRST Network Facility is to follow the instructions in 2.C.
C. For all gearbox housings that were found to have an incompletely drilled hole or with
burrs/debris noted around the hole, in oil delivery lines, in the check valve or in the screen, do
the following:
(1) Disassemble the gearbox (REF. OMM).
(2) Do the Rolls--Royce approved gearbox repair procedure for the #6, #7 and #8 bearing oil
passage.
(3) Assemble the gearbox (REF. OMM).
(4) Disassemble the turbine to the #8 bearing (REF. O/H).
(5) Replace the #8 bearing (REF. OMM).
(6) Do an inspection of the #8 bearing bore (REF. OMM).
(7) Clean and flush all oil lines, check valve, #6, #7 oil jet, and #8 oil jet (REF. O/H).
(8) Assemble the turbine (REF O/H).
June 30, 2005 250--C30 Series CEB--A--72--3274
250--C40 Series CEB--A--72--5050
250--C47 Series CEB--A--72--6056
Page 5 of 8
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EXPORT CONTROLLED Rolls--Royce
COMMERCIAL ENGINE BULLETIN
Gearbox Housing Borescope Access
FIG. 1
June 30, 2005 250--C30 Series CEB--A--72--3274
250--C40 Series CEB--A--72--5050
250--C47 Series CEB--A--72--6056
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EXPORT CONTROLLED Rolls--Royce
COMMERCIAL ENGINE BULLETIN
D. Record compliance with this bulletin in the applicable section of the engine logbook, Engine
Assembly (white pages), AD Note Compliance and CEB Modification Record, Part III, as well as
Gearbox Assembly (yellow pages), AD Note Compliance and CEB Modification Record, Part III,
as applicable with the following:
250--C30 Series CEB--A--72--3274
250--C40 Series CEB--A--72--5050
250--C47 Series CEB--A--72--6056
3. MATERIAL INFORMATION
A. Configuration Chart
QTY/ QTY/ INSTRUCTIONS/
NEW P/N ENG NAME OLD P/N ENG DISPOSITION
23064603 1 Housing, Gearbox 23064603 1 2
23076082 1 Housing, Gearbox 23076082 1 2
23058131 1 #8 Bearing 23058131 1 1
INSTRUCTIONS/DISPOSITION NOTES
1. New item, if required.
2. Rework at a FIRST Network Facility, if required.
CUSTOMER SUPPORT
ROLLS-ROYCE
June 30, 2005 250--C30 Series CEB--A--72--3274
250--C40 Series CEB--A--72--5050
250--C47 Series CEB--A--72--6056
Page 7 of 8
ALERT
EXPORT CONTROLLED Rolls--Royce
COMMERCIAL ENGINE BULLETIN
CEB--A--72--3274
CEB--A--72--5050
CEB--A--72--6056
Please email the following to Rolls--Royce at: model250custsupp@rolls--royce.com
Operator: ___________________________________
Engine S/N: __________________________________
G/B S/N: ____________________________________
Borescope Results: Pass/Fail
If engine is to be removed please indicate FIRST Network Facility doing the work.
June 30, 2005 250--C30 Series CEB--A--72--3274
250--C40 Series CEB--A--72--5050
250--C47 Series CEB--A--72--6056
Page 8 of 8
