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.
Other: First Quarter of 2012 (Target Availability).
The oil scavenge tube P/N 2363M38G01 is affected by this Service Bulletin.
B.Description
This Service Bulletin releases a new oil scavenge tube P/N 2487M14G01 that replaces the integral welded fitting tab integrated to the tube with a separate cushioned loop clamp P/N J1431P12.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience or option.
NOTE:
This Service Bulletin can be accomplished in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce a new part and improve maintainability.
(2)Condition:
The oil scavenge tube installation and tube-bearing housing stack-up misalignment.
(3)Cause:
The current oil scavenge tube with an integral welded fitting tab is causing stack-up issues during assembly procedure.
(4)Improvement:
The new oil scavenge tube assembly design improves producibility and provides an improved installation fitting capability at 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 oil tubes 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: 573386
 
BPP:11-79-00-03
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
The new oil scavenge tube and cushioned loop clamp replace the old oil scavenge tube and must be introduced at the same time 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:
 
Part Number
Qty/ Eng
Part Name
Unit ($) Price
Pkg Qty
Lead Time Days
 
2487M14G01
(1)
Tube, Oil Scavenge
Quote
(-)
Quote
 
J1431P12
(1)
Clamp, Cushioned Loop
21.75
(5)
25
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)
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
-/-
 
.2487M14G01
40-021, 79-22-10
(1)
Tube, Oil Scavenge
(SIN 451A0)
.2363M38G01
40-020, 79-22-10
(1)
RE
5/B
 
.J1431P12
40-090A, 79-22-10
(2)
Clamp, Cushioned Loop
(SIN 451V0)
.J1431P12
40-090, 79-22-10
(1)
QTC
5/-
Operation Codes
RE=Replace
RM=Remains
QTC=Quantity Change
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
Use serviceable old parts for engines that have not changed.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal
(1)Removal instructions for the oil scavenge tube (1, Figure 1) have not changed. Refer to the GEnx-1B EM, 72-00-23, REMOVAL 001, Subtask 72-00-23-020-007.
B.Installation
(1)Install the oil scavenge tube (1, Figure 1) as follows:
WARNING:
LUBRICATING OILS MAY CAUSE SKIN, EYE, AND RESPIRATORY IRRITATION WITH PROLONGED OR REPEATED CONTACT. UTILIZE PROPER PERSONAL PROTECTIVE EQUIPMENT TO PREVENT SKIN AND EYE CONTACT. IF CONTACT OCCURS, FLUSH AFFECTED AREAS WITH WATER.
(a)Use engine oil (C02-019) or engine oil (C02-023) to lubricate two packings (40-070, 79-22-10) and the internal chamfers on the two ends of the oil scavenge tube.
(b)Install one packing (40-070) on each end of the oil scavenge tube (1).
(c)Insert the aft end of the oil scavenge tube (1) into the fan hub module (25-010, 72-00-02) at approximately the 6:00 o'clock position, forward locking aft.
(d)Attach the aft section of the scavenge oil tube to the No. 1 bearing housing (01-010, 72-23-00) with a machine bolt (40-080, 79-22-10) and a cushioned loop clamp (2).
(e)Attach the forward section of the scavenge oil tube to the No. 1 bearing housing (01-010, 72-23-00) with a machine bolt (40-080, 79-22-10) and a cushioned loop clamp (40-090).
(f)Torque the machine bolts (40-080) installed in the cushioned loop clamps (2 and 40-090) to 60-70 lb in. (6.8-7.9 N.m).
Introduction of New Oil Scavenge Tube
Figure 1   (Sheet 1)
Introduction of New Oil Scavenge Tube
Figure 1   (Sheet 2)