GE PROPRIETARY INFORMATION
The information contained in this document is GE proprietary information and is disclosed in confidence. It is the property of GE and shall not be used, disclosed to others or reproduced without the express written consent of GE, including, but without limitation, it is not to be used in the creation, manufacture, development, or derivation of any repairs, modifications, spare parts, designs, or configuration changes or to obtain FAA or any other government or regulatory approval to do so. If consent is given for reproduction in whole or in part, this notice and the notice set forth on each page of this document shall appear in any such reproduction in whole or in part.
This technical data is considered EAR controlled pursuant to 15 CFR Parts 730-774 respectively. Transfer of this data by any means to a Non-US Person, whether in the United States or abroad, without the proper U.S. Government authorization (e.g., License, exemption, NLR, etc.), is strictly prohibited.
Copyright (2013) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION
REVISION 2 TO SERVICE BULLETIN 79-0012
Revision 2 is issued to update paragraphs 1., PLANNING INFORMATION
, 3., ACCOMPLISHMENT INSTRUCTIONS, and 4., APPENDIX A.
Revision 1 was issued June 04, 2013. The original was issued June 18, 2012. Revision bars in the left margin identify changes.
1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B58, -1B64, -1B67, -1B70
This Service Bulletin is applicable to all GEnx-1B engines PRE Service Bulletin 72-0106.
B.Description
This Service Bulletin recommends an interval for oil filter element replacement.
C.Compliance
Category 2
 GE recommends that you do this Service Bulletin at first maintenance opportunity, not to interfere with revenue service. Replace the oil filter at each of the following engine times since new (ETSN) 200 hours, 500 hours, and 1,000 hours. After these three oil filter changes, it is recommended to replace the oil filter at a maximum interval of 1,000 flight hours since the installation of the new oil filter, refer to the table below.
Table 1
 
Filter Change
ETSN
 
1st
200 hours
 
2nd
500 hours
 
3rd
1,000 hours
 
4th and all subsequent filters
At a maximum interval of 1,000 hours
NOTE:
This Service Bulletin can be accomplished on wing.
  NOTE:
If the ETSN is greater than 200 hours, and the oil filter has not been changed since the engine entered service, it is recommended that the oil filter be changed at the next maintenance opportunity. The subsequent oil filter changes should then follow the above schedule (refer to Table 1) i.e. the first filter change should operate for a maximum of 300 hours, and the second oil filter change should operate for a maximum of 500 hours.
NOTE:
Compliance with Service Bulletin 72-0106, the new 4R rotor seal, is terminating action for the 4R seal control programme. After the incorporation of the new seal, the engine oil filter replacement will revert to "on condition", and replacement at the reduced oil filter delta pressure limit of 10 psid (69 kPa) will no longer apply. This Service Bulletin, 79-0012, remains applicable to all PRE Service Bulletin 72-0106 engines.
This Service Bulletin is offered to improve the reliability or performance of your GE product, or to help prevent the occurrence of the event or condition described in this Service Bulletin. If the operator elects not to participate in the bulletin, that decision will be taken into consideration by GE in evaluating future product performance issues that may arise in the operators fleet.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To improve reliability.
(2)Condition:
 Normal engine operation generates oil system debris that is captured by the oil filter. The total amount of particles filtered out increases with time, leading to an increase in oil filter delta pressure and a decrease in the filter capacity. The original (pre-GEnx-1B S/B 72-0106) design of 4R aft rotor seal (No. 4 roller bearing rotating air/oil seal) is susceptible to a transient thermal instability that can lead to a heavy seal rub. The fine abradable seal material from the stator seal enters the oil system which can cause a relatively quick blockage of the oil filter. The blockage can lead to a high oil filter delta pressure indication and potential for a flight deck oil filter bypass (EICAS) message, ENG OIL FILTER X, to occur (the X in the advisory denotes the engine position L for left and R for right).
(3)Cause:
Oil filters with more time have a decreased capacity to accommodate abradable seal material from a heavy seal rub. This is due to being partially full of system debris that has been captured by the oil filter from normal engine operation.
(4)Improvement:
 Periodic replacement of the oil filter at 200, 500, and 1,000 hours ETSN, and then at every 1,000 flight hours, will provide an improved capacity for the oil filter to handle a heavy seal rub and the associated quantity of fine abradable seal material that could enter the oil system. This will minimize the potential for a high oil filter delta pressure indication and an actionable flight deck advisory message to occur.
(5)Substantiation:
Substantiation is by test, analysis, and comparative analysis.
F.Approval
This Service Bulletin contains no modification information that revises the approved configuration and therefore does not require FAA approval.
G.Manpower
After you get access to the engine, you will need approximately 1 man-hour to replace the engine oil filter element, inspect the DMS sensor, and perform the idle leak test.
H.Weight and Balance
Weight and balance are not changed.
I.References
GEK 112851, GEnx-1B Engine Manual (EM)
GEnx-1B S/B 72-0106, ENGINE - Propulsor Module Assembly (72-00-00) - Introduction of New Seal P/N 2503M02P01
Boeing 787 Aircraft Maintenance Manual (AMM)
J.Publications Affected
None.
K.Interchangeability
Not applicable.
L.Software Accomplishment Summary
Not applicable.
2.MATERIAL INFORMATION
A.Material - Price and Availability
(1)Parts necessary to do this Service Bulletin:
 
Part Number
Qty/ Eng
Part Name
Unit ($) Price
Pkg Qty
Lead Time Days
 
2313M35G01*
(1)
Element, Oil Filter
NP
(-)
--
*Part not supplied by GE Engine Service Distribution L.L.C., see vendor FSCM A3460.
NP = Not Provisioned
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
 
Part Number
Qty/ Eng
Part Name
Unit ($) Price
Pkg Qty
Lead Time Days
 
LR26393-153 *
(1)
Packing, Preformed
NP
(-)
--
 
J1438P153*
(ALT)
Packing, Preformed
40.50
(5)
10
 
LR26393-016*
(1)
Packing, Preformed
NP
(-)
--
 
J1438P016*
(ALT)
Packing, Preformed
17.75
(1)
30
*Part not supplied by GE Engine Service Distribution L.L.C., see vendor FSCM A3460.
NP = Not Provisioned
NOTE:
Prices are provided for planning purposes and are subject to change.
(3)Consumables:
None.
B.Industry Support Information
Contact your Customer Support Manager (CSM) for support details.
C.Configuration Chart
None.
D.Parts Disposition
Do not discard old parts immediately. If there are any unusual findings, please retain the removed oil filter, along with any debris findings, for a minimum of 30 days after sending in the report of the filter change to GE as GE may request the return of the filter, and/or any debris, on Service Request (SR) for review.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
(1)
 GE recommends that the oil filter be replaced at 200, 500, and 1,000 hours ETSN, and then at a maximum interval of 1,000 flight hours. Diagnostic trending of individual engines will also be used to determine if an oil filter change is warranted. A customer notification report (CNR) will be issued if the cruise oil filter delta pressure exceeds a threshold limit. The current CNR limit is set at 10 psid (68 kPa).
(a)Remove the oil filter element. Refer to Boeing 787 AMM, TASK B787-A-G79-21-07-00B-520A-A.
(b)Install the oil filter element. Refer to Boeing 787 AMM, TASK B787-A-G79-21-07-00B-720A-A.
(c)After completing the oil filter change and any applicable AMM tasks, please report the information requested in Appendix B to GE.
NOTE:
The GEnx-1B EM, TASK 05-22-00-200-801, recommends that the DMS sensor be inspected at oil filter replacement. The AMM oil filter element installation task also notes this requirement. The AMM provides the DMS clean, inspect, and DMS chip count reset procedures. Refer to Boeing 787 AMM, TASK B787-A-G79-00-00-03B-311A-A and Boeing 787 AMM, TASK B787-A-G71-00-00-44B-320A-A.
4.APPENDIX A
Although the lube pump scavenge screens are not inspected at a normal oil filter change, the following parts are suggested to have available at all maintenance bases (including outstation facilities) and in the fly away kit:
 
Description
Part Number
Fly Away Kit
QPE
Alt Part
Comments
 
Element, Oil Filter
2313M35G01
X
1
 
Packing, Preformed
LR26393-122
*
J1438P122
* This seal is supplied with the filter
 
Packing, Preformed
LR26393-153
X
1
ALT J1438P153
 
Packing, Preformed
LR26393-016
X
1
ALT J1438P016
 
Seal, Omni
230-016-0107
1
Do not remove - replacement is not normally required for this seal
 
Packing, Preformed
J1438P016
X
1
Reuse if serviceable - Refer to AMM
 
Packing, Preformed
LR26393-916
X
1
J1438P916
ALT in SB 79-0004
 
Packing, Preformed
LR26393-918
X
3
J1438P918
ALT in SB 79-0004
 
Packing, Preformed
LR26393-924
X
1
J1438P924
ALT in SB 79-0004
5.APPENDIX B
NOTE:
This information report is no longer required on a routine basis. But if there are any unusual results during the oil filter replacement and inspections, report these to GE with the information below.
After completing the oil filter change please report the following information to GE:
DATE FILTER REPLACED:
ESN:
TSN:
CSN:
FILTER TSN:
FILTER CSN:
OIL FILTER DELTA PRESSURE FOR FLIGHT PRIOR TO REPLACEMENT:
DMS FINDINGS:
*Please include pictures of any debris findings when sending in this report to GE.
Do not discard old parts immediately. If there are any unusual findings, please retain the removed oil filter, along with any debris findings, for a minimum of 30 days after sending in the report of the filter change to GE as GE may request the return of the filter, and / or any debris, on SR for review.
Submit this information to the FSE or directly to GE, referencing this SB number, to:
Aviation Operations Center
GE Aircraft Engines, M/D 285
One Neumann Way
Cincinnati, OH 45215
U.S.A
geae.aoc@ge.com
International phone (513) 552-3272
USA Phone (877) GEAE-CSC