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 956140 and up.
These serial numbers are the best available data.
The transient bleed air manifold [transient bleed valve (TBV) duct] P/N 2446M11G01, support brackets (brackets) P/N 2412M02G01 and P/N 2372M32G01, and retaining strap P/N 9134M25P57 are affected by this Service Bulletin.
B.Description
This Service Bulletin releases to production a new TBV duct P/N 2459M31G01 and all surrounding hardware. This new TBV duct goes from stage 10 port to the TBV.
C.Compliance
Category 7
GE recommends that you do this Service Bulletin at customer's convenience.
NOTE:
This Service Bulletin can be accomplished on wing or in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To introduce new parts, improve maintainability, and reduce weight.
(2)Condition:
The two-port TBV duct is heavier than the new designed one-port TBV duct.
(3)Cause:
Unnecessary weight and space created by the two-port TBV duct.
(4)Improvement:
The new one-port TBV duct results lighter than the two-port TBV duct. Additionally, it is easier to manufacture and can be removed and installed from the engine on wing.
(5)Substantiation:
Substantiation is by comparative analysis and test.
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 TBV, you will need approximately 5 man-hours to do the replacement portion of this Service Bulletin.
H.Weight and Balance
The complete compliance with this Service Bulletin decreases weight by 5.06 lb (2.30 kg).
I.References (Use the latest version of these documents)
Boeing 787 Aircraft Maintenance Manual (AMM)
GEK 9250, Commercial Engine Standard Practices Manual
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: 573110
 
BPP: 10-75-00-15
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
Boieng 787 Aircraft Maintenance Manual (AMM)
K.Interchangeability
Qualified interchangeability.
All parts must be introduced concurrently. Mixing of the new and old hardware 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
 
2470M61G01
(1)
Bracket, Fuel
Quote
(-)
Quote
 
2459M31G01
(1)
Duct, Air
Quote
(-)
Quote
 
2470M62G01
(1)
Bracket, Air
Quote
(-)
Quote
 
2411M23G01
(ALT)
Bracket, Transient Bleed
Quote
(-)
Quote
 
2462M68P01
(1)
Cover
Quote
(-)
Quote
 
9134M25P45
(1)
Strap, Retaining
Quote
(-)
Quote
 
2105M71P01
(2)
Seal Ring
Quote
(-)
Quote
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
None.
(3)Consumables:
 
Code Number
Description
 
C02-033
Petrolatum, Soft (Fed Spec. VV-P-236)
(petrolatum)
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
-/-
 
.2470M61G01
05-040A, 75-31-21
(1)
Bracket, Support
(Old Name)
Bracket, Fuel Manifold
(New Name)
(SIN 34112)
.2412M02G01
05-040, 75-31-21
(1)
RE
5/B
 
.2459M31G01
05-012, 75-31-21
(1)
Manifold, Transient Bleed Air
(Old Name)
Duct, Transient Bleed Air
(New Name)
(SIN 61A00)
.2446M11G01
05-010, 75-31-21
(1)
RE
5/B
 
.2470M62G01
33-266, 72-00-02
(1)
Bracket, Support
(Old Name)
Bracket, Transient Bleed Air
(New Name)
(SIN 61A10)
.2372M32G01
33-250, 72-00-02
(1)
RE
5/B
 
.2411M23G01
33-269, 72-00-02
(ALT)
Bracket, Transient Bleed
(SIN 61A10)
--
(-)
AD
5/-
 
..MS21076-4N
33-267, 72-00-02
(2)
Nut, Plate
(SIN 61A10-4)
--
(-)
AD
5/-
 
..AN123473
33-268, 72-00-02
(4)
Rivet, Solid
(SIN 61A10-5)
--
(-)
AD
5/-
 
.2462M68P01
05-80, 75-31-21
(1)
Cover, CDP Port
(SIN 61A61)
--
(-)
AD
5/-
 
.9134M25P45
05-060A, 75-31-21
(1)
Strap, Retaining
(SIN 61A81)
.9134M25P57
05-060, 75-31-21
(1)
RE
5/B
 
Operation Codes
AD=Add
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
Discard old parts.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.General
(1)Make sure that personnel read the assembly and disassembly techniques section. Refer to the SPM, 70-10-00, ASSEMBLY AND DISASSEMBLY TECHNIQUES, TASK 70-10-00-800-009.
(2)Install protective covers/plugs on tubes and hoses to prevent damage and contamination.
(3)Make sure that personnel obey all site safety and environmental controls or personal injury can occur.
B.Removal of the TBV System
(1)Remove the TBV system. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 003, Subtask 72-00-02-030-393.
(2)Discard the old TBV duct (2, Figure 1), brackets (4 and 6), retaining strap (7), and seal rings (1).
C.Installation of the TBV System
(1)Installation procedures for the TBV system have not changed, except for the installation of the new TBV duct (2, Figure 1). Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 004, Subtask 72-00-02-440-122 and to step 3.C.(2) of this Service Bulletin for the new TVB duct (2) installation.
(2)Install the new TBV duct (2, Figure 1) as follows:
(a)Install two new seal rings (1), one on the TBV duct (2) and one on the cover (12).
NOTE:
C02-033 petrolatum can be used to hold the seals in place.
(b)Install the cover (12) and the TBV duct (2) on the combustor case (3) as follows:
1Install the cover (12) in position at the 12:00 o'clock port on the combustor case (3).
2Install the bracket (4) on the cover (12). Align the holes of the bracket (4) with the holes on the right side of the cover (12).
3Attach the cover (12) and the bracket (4) to the combustor case (3) with bolts (5).
4Install the TBV duct (2) in position at the 1:00 o'clock port on the combustor case (3).
5Install the TBV duct (2) to the combustor case (3) with bolts (5).
6Install the TBV duct (2) to the bracket (6) with a retaining strap (7) and bolts (8).
7Install a ring seal (9) between the TBV duct (2) and the TBV (10).
NOTE:
C02-033 petrolatum can be used to hold the seals in place.
8Install the TBV (10) in position on the TBV duct (2) with the lock/unlock rods pointed outboard and perpendicular to the combustor case (3).
9Attach the TBV (10) to the TBV duct (2) with a ring seal (11). Install the ring seal (11) with the nut outboard and pointed forward.
NOTE:
Install the ring seal (11) with the nut outboard and pointed forward.
10Torque the bolts (5) at the 12:00 o'clock port in a criss-cross pattern to 368-432 lb in. (41.6-48.8 Nm).
11Torque the bolts (5) at the 1:00 o'clock port in a criss-cross pattern to 368-432 lb in. (41.6-48.8 Nm).
12Torque the nut of the ring seal (11) to 106-124 lb in. (12.0-14.0 Nm).
13Torque the bolts (8) on the retaining strap (7) to 106-124 lb in. (12.0-14.0 Nm).
TBV Duct
Figure 1   (Sheet 1)
TBV Duct
Figure 1   (Sheet 2)
TBV Duct
Figure 1   (Sheet 3)