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 (2018) General Electric Company, U.S.A.
TRANSMITTAL INFORMATION
REVISION 1 TO SERVICE BULLETIN 79-0003
Revision 1 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS.
The original was issued December 19, 2011. 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 these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-110 and up.
These serial numbers are the best available data.
The oil return tube (oil scavenge tube) P/N 2366M93G01 is affected by this Service Bulletin.
B.Description
This Service Bulletin introduces the new oil scavenge tube P/N 2379M80G01 and support bracket P/N 2447M79G01.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience.
 Impact F
 Implement as deemed necessary per the Service Bulletin Category.
NOTE:
This Service Bulletin can be accomplished on wing.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts and improve maintainability.
(2)Condition:
Current oil scavenge tube interferes with the removal path of the oil tank level sensor.
(3)Cause:
This condition causes delays and additional operations at removal of the oil tank level sensor.
(4)Improvement:
The new oil scavenge tube was re-routed to allow the proper removal of the oil tank level sensor.
(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
After you get access to the oil tank, you will need approximately 1.0 man-hour for each engine.
H.Weight and Balance
The complete compliance with this Service Bulletin increases weight by 0.36 lb (0.16 kg).
I.References (Use the latest version of these documents)
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
GEnx-1B Boeing 787 Aircraft Maintenance Manual (AMM)
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
 
CID: 547290
 
BPP: 10-72-00-06
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
GEnx-1B Boeing 787 Aircraft Maintenance Manual (AMM)
K.Interchangeability
The new oil scavenge tube P/N 2379M80G01 needs to be installed as a set with the new support bracket P/N 2447M79G01.
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
 
2379M80G01
(1)
Tube, Oil Return
8,063.00
(1)
5
 
2447M79G01
(1)
Bracket, Support
334.00
(1)
Quote
 
MS9556-08*
(2)
Bolt, Double Hexagon Head Machine
NP
(-)
--
 
M85449-3-20*
(1)
P-Clamp
NP
(-)
--
NP = Not Provisioned
*Part not supplied by GE Engine Services Distribution L.L.C.
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
None.
(3)Consumables:
 
Code Number
Description
 
C02-019
Oil, Engine Lubricating (GE Spec. D50TF1)
(engine oil)
 
C02-023
Oil, Engine Lubricating (MIL-PRF-23699)
(engine oil)
 
C02-058
Compound, Thread Lubricating (GE Spec. A50TF201 Class A)
(thread lubricant)
 
C03-001
Primer, Zinc Chromate
(primer)
 
C03-100
Primer, Paint, Zinc-Molybdate, Alkyd Type (TT-P-645)
(primer)
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
 
2305M15G04
(X)
Assembly, Fan Stator Module
2305M15G04
(X)
RM
-/-
 
.2379M80G01
01-011, 79-22-20
(1)
Tube, Oil Return
(SIN 45304)
.2366M93G01
01-010, 79-22-20
(1)
RE
5/B
 
.2447M79G01
01-140, 79-22-20
(1)
Bracket, Support
(SIN 45312)
--
(-)
AD
5/-
 
.MS9556-08
01-040A, 79-22-20
(16)
Bolt, Double Hexagon Head Machine
(SIN 45323)
.MS9556-08
01-040, 79-22-20
(14)
QTC
5/-
 
.M85449-3-20
01-050A, 79-22-20
(8)
P-Clamp
(SIN 45381)
.M85449-3-20
01-050, 79-22-20
(7)
QTC
5/-
Operation Codes
AD=Add
QTC=Quantity Change RE=Replace
RM=Remains
Change Code
5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Code
B=Old parts will be supplied until all old parts are sold.
D.Parts Disposition
None.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal of the Oil Scavenge Tube
(1)Removal instructions for the oil scavenge tube (1, Figure 1) have not changed. Refer to the GEnx-1B EM, 72-00-01, DISASSEMBLY 001, Subtask 72-00-01-040-053.
B.Installation of the Oil Scavenge Tube
(1)Install the support bracket (01-030, 72-00-01) and support bracket (1, Figure 2) to the forward ring where the fan case assembly and the fan aft case are connected at boltholes No. 30 and 31. Refer to Figure 2 and do as follows:
WARNING:
DO NOT USE THE PRIMER NEAR FLAMES OR HEAT, BECAUSE THE PRIMER IS FLAMMABLE. DO NOT LET THE PRIMER TOUCH YOU. THE PRIMER IS DANGEROUS TO YOUR SKIN AND EYES. DO NOT BREATHE THE FUMES FROM THE PRIMER. THE FUMES ARE DANGEROUS TO YOUR KIDNEYS AND LIVER. MAKE SURE YOU HAVE A GOOD FLOW OF AIR.
(a)Apply C03-001 primer or C03-100 primer to the threads and friction surfaces of the bolts (01-050), the internal diameter (ID) of the boltholes, and the surface of the support bracket (01-030) and support bracket (1) that contacts the fan case.
WARNING:
CONTACT WITH EYES/FACE/SKIN MAY CAUSE IRRITATION OR BURNING. PERSONAL PROTECTIVE EQUIPMENT REQUIRED WHEN HANDLING OR USING THIS MATERIAL.
(b)Apply C02-058 thread lubricant to the threads of the bolts (01-050) and the self-locking nuts (01-060).
(c)Install the bolts (01-050) in the boltholes on the forward side of the fan case forward ring.
(d)Install the support bracket (01-030) and support bracket (1) on the aft side of the split flange at boltholes No. 30 and 31. Refer to Figure 2.
(e)Install the self-locking nuts (01-060) on the bolts (01-050) on the aft side of the fan case forward ring.
(f)Torque the self-locking nuts (01-060) to 202-238 lb in. (22.9-26.9 Nm).
(g)Torque the self-locking nuts (01-060) again to 202-238 lb in. (22.9-26.9 Nm).
(2)Install the oil scavenge tube (1, Figure 1) to the oil tank (01-010, 79-11-10) assembly. Refer to Figure 1 and do as follows:
WARNING:
DO NOT LET LUBRICATING OIL STAY ON YOUR SKIN. DO NOT BREATHE THE FUMES RELEASED FROM LUBRICATING OIL FOR A LONG TIME. LUBRICATING OIL IS DANGEROUS TO YOUR EYES, NOSE, AND LUNGS.
(a)Apply C02-019 engine oil or C02-023 engine oil to the flange seal gasket (01-030, 79-22-20).
(b)Install the gasket (01-030) on the lubriclone assembly (01-010, 79-21-20) and attach the oil scavenge tube (1, Figure 1) with the machine bolts (01-020, 79-22-20) at four locations. Do not torque the machine bolts (01-020) at this time.
 (c)Install the gasket (01-030) on the oil return tube (01-090) or (01-090A) and attach the oil scavenge tube (1) with the machine bolts (01-060) at four locations. Do not torque the machine bolts (01-060) at this time.
(d)Install a P-clamp (3) on the support bracket (2) with the bolt (4).
(e)Install the remaining P-clamps (3) around the oil scavenge tube (1) at three locations with the remaining bolts (4).
 (f)Torque the bolts (01-020) that attach the oil scavenge tube (1) to the lubriclone assembly (01-010, 79-21-20) to 106 to 124 lb in. (11.9 to 14.0 Nm).
 (g)Torque the bolts (01-060, 79-22-20) that attach the oil scavenge tube (1) to the oil return tube (01-090) or (01-090A) to 106 to 124 lb in. (11.9 to 14.0 Nm).
 (h)Torque the bolt (4) on the P-clamp (3) to 51 to 59 lb in. (5.7 to 6.6 Nm).
Installation of the Oil Scavenge Tube
Figure 1  
Installation of the Support Bracket
Figure 2   (Sheet 1)
Installation of the Support Bracket
Figure 2   (Sheet 2)