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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 (2015) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION
REVISION 1 TO SERVICE BULLETIN 79-0017
Revision 1 is issued to update the title and paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS.
The original was issued June 23, 2014. Revision bars in the left margin identify changes.
1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B64, -1B64/P1, -1B64/P2, -1B67, -1B67/P1, -1B67/P2, -1B70, -1B70/75/P1, -1B70/75/P2, -1B70/P1, -1B70/P2, -1B74/75/P1, -1B74/75/P2
This Service Bulletin has been introduced in production to this GEnx-1B engine:
•
GEnx-1B engine, serial number 956-317.
This serial number is the best available data.
 The variable frequency starter generator (VFSG) oil tube P/N ER5738G01 and oil VFSG tube P/N ER5739G01 are affected by this Service Bulletin.
B.Description
 This Service Bulletin introduces new VFSG oil tube P/N ER8101G01 and oil VFSG tube P/N ER8102G01 with a new design, which improves a clearance between the B-nut and the main body heat shield.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience/option.
NOTE:
This Service Bulletin can be accomplished on wing or in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts and improve maintainability.
(2)Condition:
 The current VFSG oil tube and oil VFSG tube have a very close clearance to the main body heat shield, making assembly/maintainability difficult and time consuming.
(3)Cause:
 The current geometry of the VFSG oil tube and oil VFSG tube, together with the flexibility of the whole system, place the B-nut too close to the main body heat shield.
(4)Improvement:
 The proposed routing for the VFSG oil tube and oil VFSG tube results in an increase of the clearance between the B-nut and the main body heat shield and shows a positive impact on assembly and maintainability.
(5)Substantiation:
Substantiation is by analysis and comparative analysis.
F.Approval
This Service Bulletin has been reviewed by the FAA and the repair(s) and modification(s) herein comply with the applicable Federal Aviation Regulations and are FAA APPROVED for installation in the model(s) listed in this Service Bulletin.
G.Manpower
No additional man-hours are required to comply with this Service Bulletin.
H.Weight and Balance
Weight and balance are not changed.
I.References (Use the latest version of these documents)
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
CID: 573889
BPP: 12-72-00-03
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
 The old VFSG oil tube P/N ER5738G01 must be interchangeable with the new VFSG oil tube P/N ER8101G01 and the old oil VFSG tube P/N ER5739G01 must be interchangeable with the new oil VFSG tube P/N ER8102G01 as a complete set on an applicable GEnx-1B engine.
Mixing the details of the proposed and superseded hardware on the same engine is not permitted.
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
 
ER8101G01
(1)
Tube, Oil VFSG
639.00
(1)
30
 
ER8102G01
(1)
Tube, Oil VFSG
1,557.00
(1)
30
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
None.
(3)Consumables:
None.
B.Industry Support Information
None.
C.Configuration Chart
 
New Part Number
Qty/ Eng
Part Name
Old Part Number/ IPC Location
Qty/ Eng
Op Code
Chg/ Sprt Code
 
2376M20G05/ G06/G07/G08/ G09
(X)
Assembly, Propulsor Module
2376M20G05/ G06/G07/G08/ G09
(X)
RM
-/-
 
2447M20G01/ G02
(X)
Assembly, Propulsor Module
2447M20G01/ G02
(X)
RM
-/-
 
.ER8101G01
30-110B, 79-22-10
(1)
Tube Hose, VFSG Oil
(Old Name)
Tube, Oil VFSG
(New Name)
(SIN 5210U)
.ER5738G01
30-110A, 79-22-10
(1)
RE
5/B
 
.ER8102G01
30-310A, 79-22-10
(1)
Tube, Oil VFSG
(SIN 5210Y)
.ER5739G01
30-310, 79-22-10
(1)
RE
5/B
Operation Codes
RE=Replace
RM=Remains
Change Codes
5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Codes
B=Old parts will be supplied until all old parts are sold.
D.Parts Disposition
Old parts will be supplied until all parts are sold.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal
 (1)Drain the oil from the VFSG and remove the VFSG oil tube (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 001, Subtask 72-00-02-030-458.
(2)Disconnect the oil VFSG tube (2, Figure 1) from the upper VFSG oil manifold (30-030, 79-22-10). Refer to the GEnx-1B EM, 72-00-05, REMOVAL 001, Subtask 72-00-05-020-036, and do as follows:
(a)Loosen the B-nuts that attach the oil VFSG tube (2, Figure 1) to the upper VFSG oil manifold (30-030, 79-22-10).
(b)Disconnect the oil VFSG tube (2).
(3)Remove the oil VFSG tube (2) from the main body heat shield (40-010, 72-00-02). Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, Subtask 72-00-02-030-417, and do as follows:
(a)Remove the machine bolts (30-130, 79-22-10) and cushion loop clamps (30-140) that attach the oil VFSG tube (2, Figure 1) to the main body heat shield (40-010, 72-00-02). Remove the oil VFSG tube (2).
B.Assembly
 (1)Connect the oil VFSG tube (2, Figure 1) to the B-nuts on the VFSG oil tube (1). Refer to the GEnx-1B, 72-00-02, ASSEMBLY 005, CONFIGURATION 01, Subtask 72-00-02-440-446 or CONFIGURATION 02, Subtask 72-00-02-440-304.
(2)Torque the B-nut to 662-778 lb in. (74.8-87.9 Nm).
 (3)Install the VFSG oil tube (1, Figure 1) on the lower VFSG (C00A0) as follows:
 (a)Connect the VFSG oil tube (1) to the check valve (C00A2).
 (b)Use a backup wrench and crowfoot 90 degrees to torque the B-nut to 938-1102 lb in. (106.0-124.5 Nm).
(4)Attach the upper VFSG oil manifold (30-030, 79-22-10) to the B-nut on the oil VFSG tube (2, Figure 1). Refer to the GEnx-1B EM, 72-00-05, INSTALLATION 001, Subtask 72-00-05-420-009.
(5)Torque the B-nuts to 662-778 lb in. (74.8-87.9 Nm).
 (6)Install the oil VFSG tube (2, Figure 1) and VFSG oil tube (1). Refer to the GEnx-1B, 72-00-02, ASSEMBLY 005, CONFIGURATION 01, Subtask 72-00-02-440-446 or CONFIGURATION 02, Subtask 72-00-02-440-304, and do as follows:
(a)Attach the oil VFSG tube (2, Figure 1) to the main body heat shield (40-010, 72-00-02) at four locations with cushion loop clamps (30-140, 79-22-10) and machine bolts (30-130).
(b)Torque the machine bolts (30-130) to 60-70 lb in. (6.8-7.9 Nm).
Location of VFSG Oil Tubes
Figure 1   (Sheet 1)
Location of VFSG Oil Tubes
Figure 1   (Sheet 2)