1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B54, -1B58, -1B64, -1B67, -1B70
This Service Bulletin has been introduced in production to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-179 and up.
These serial numbers are the best available data.
The oil drain tube P/N 2323M31G01 is affected by this Service Bulletin.
B.Description
This Service Bulletin introduces an improved oil drain tube P/N 2498M78G01 with a B-nut change to allow safety wire retention feature.
C.Compliance
Category 5
GE recommends that you do this Service Bulletin as soon as the oil drain tube is removed from the engine.
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.
NOTE:
This Service Bulletin can be accomplished in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce a new part, improve reliability, and improve maintainability.
(2)Condition:
The current B-nut on the oil drain tube does not have lock-wire holes but the mating part does have lock-wire holes.
(3)Cause:
During engine build, assembly marked this condition of having lock-wire holes on one part and no lock-wire holes on the mating part. This condition can be confusing for assembly to determine if safety cable is required.
(4)Improvement:
The proposed changes will ensure no oil leakage from the No. 1 bearing oil drain line and also clarifies the need of a safety cable during engine assembly.
(5)Substantiation:
Substantiation is by 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 No.1 bearing assembly, you will need approximately 1.0 man-hour for each engine or component.
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 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
 
CID: 573400
 
BPP: 08-79-00-13
J.Publications Affected
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
Safety cable needs to be introduced at the same time as the new oil drain tube and all changes are introduced as qualified interchangeable.
L.Software Accomplishment Summary
Not applicable.
2.MATERIAL INFORMATION
A.Material - Price and Availability
(1)Parts necessary to do this Service Bulletin:
None.
(2)Other Spare Parts:
 
Part Number
Qty/ Eng
Part Name
Unit ($) Price
Pkg Qty
Lead Time Days
 
736L680G01
(AR)
Safety Cable
Quote
(-)
Quote
 
R297P04
(ALT)
Safety Cable
Quote
(-)
Quote
NOTE:
Prices are provided for planning purposes and are subject to change.
(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
(X)
Propulsor Module Assembly
2376M20G05/G06
(X)
RM
-/-
 
.2498M78G01
40-010A, 79-22-10
(1)
Tube, Oil Drain
(SIN 484A0)
.2323M31G01
40-010, 79-22-10
(1)
RW
5/A
 
.736L680G01
(AR)
Safety Cable
--
(-)
AD
5/-
 
.R297P04
(ALT)
Safety Wire
--
(-)
AD
5/-
Operation Codes
AD=Add
RM=Remains
RW=Rework
Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Code A=Old parts will no longer be supplied.
D.Parts Disposition
Discard old parts.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
(1)Removal instructions for the oil drain tube (1, Figure 1) have not changed. Refer to the GEnx-1B EM, 72-00-23, REMOVAL, Subtask 72-00-23-020-005.
(2)Installation instructions for the oil drain tube (1) have not changed. Refer to the GEnx-1B EM, 72-00-23, INSTALLATION 001, Subtask 72-00-23-420-022.
Location of the Oil Drain Tube
Figure 1