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 956-102 and up.
These serial numbers are the best available data.
The old outer seal P/N 2105M12P02, support bracket P/N 2351M42G01, and nut P/N AS3486-10 are affected by this Service Bulletin.
B.Description
This Service Bulletin releases the new outer seal P/N 2459M14P01 and support bracket P/N 2459M76G01.
C.Compliance
Category 9
Information only.
NOTE:
This Service Bulletin can be accomplished on wing or in shop.
New hardware was installed on all production engines and GE lease pool engines, before to entry into service.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts and improve reliability.
(2)Condition:
The oil vent tube connections have shown oil staining during flight testing.
(3)Cause:
Insufficient compression of the outer seal and bending of the support bracket were identified as the root cause.
(4)Improvement:
The new outer seal provides an improved compression. The new support bracket has an increased thickness to eliminate bending. Additionally, the support bracket has riveted nutplates, that replace the loose nuts, for ease installation of the support bracket.
(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
The complete compliance with this Service Bulletin increases weight by 0.10 lb (0.05 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)
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
 
CID: 573076
 
BPP: 10-72-00-16
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
K.Interchangeability
The new parts must be introduced as a set. Do not replace old configuration parts with new configuration parts.
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
 
2459M14P01
(2)
Seal, Outer
125.75
(1)
30
 
2459M76G01
(2)
Bracket, Support
156.00
(1)
30
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 (engine oil)
 
C02-023
Oil, Engine Lubricating (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
(X)
Propulsor Module Assembly
2376M20G05
(X)
RM
-/-
 
.AS3486-10
05-050, 79-22-30
(12)
Nut, Self-Locking
.AS3486-10
05-050, 79-22-30
(18)
QTC
5/E
 
.2459M14P01
05-351, 79-22-30
(2)
Seal, Outer
.2105M12P02
05-350, 79-22-30
(2)
RE
5/A
 
.2459M76G01
05-361, 79-22-30
(2)
Bracket, Support
.2351M42G01
05-360, 79-22-30
(2)
RE
5/A
Operation Codes
QTC=Quantity Change RE=Replace
RM=Remains
Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Codes A=Old parts will no longer be supplied. E=Old parts will be supplied, and can be used at other engine locations.
D.Parts Disposition
Discard old parts.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Removal
(1)Remove the outer seal (1, Figure 1) and the support bracket (2) as follows:
(a)Remove the bolts that attach the support bracket (2) to the oil vent tube (05-150, 79-22-30) and the TCF vent tube (01-210, 72-54-00).
(b)Remove and discard the outer seal (1).
B.Installation
(1)Install the new outer seal (1, Figure 1) and the new support bracket (2) as follows:
WARNING:
LUBRICATING OILS MAY CAUSE SKIN, EYE AND RESPIRATORY IRRITATION WITH PROLONGED OR REPEATED CONTACT. USE PROPER PERSONAL PROTECTIVE EQUIPMENT TO PREVENT SKIN AND EYE CONTACT. IF EYE OR SKIN CONTACT OCCURS FLUSH EYES WITH WATER AND/OR WASH SKIN THOROUGHLY WITH SOAP AND WATER.
(a)Apply engine oil (C02-019) or engine oil (C02-023) to the outer seal (1).
(b)Put the outer seal (1) on the oil vent tube (05-150, 79-22-30).
(c)Put the oil vent tube and outer seal (1) on the turbine center frame (TCF) vent tube (01-210, 72-54-00).
(d)Attach the oil vent tube to the TCF vent tube with three machine bolts (bolts) (05-340, 79-22-30) and one support bracket (2).
(e)Torque the three bolts to 106-124 lb in. (12.0-14.0 Nm).
Introduction of New Outer Seal and Support Bracket
Figure 1   (Sheet 1)
Introduction of New Outer Seal and Support Bracket
Figure 1   (Sheet 2)
Introduction of New Outer Seal and Support Bracket
Figure 1   (Sheet 3)