TRANSMITTAL INFORMATION
REVISION 1 TO SERVICE BULLETIN 72-0048
Revision 1 is issued to update paragraph 2., MATERIAL INFORMATION and paragraph 3., ACCOMPLISHMENT INSTRUCTIONS.
The original was issued October 21, 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 956-102 and up.
B.Description
This Service Bulletin introduces the new deflectors P/Ns 2474M51P01, 2474M52P01, 2474M51P02 and hose clamps P/N 1519M13P11.
C.Compliance
Category 9
Information Only.
NOTE:
This Service Bulletin can be accomplished on wing or in shop.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
To improve reliability.
(2)Condition:
During GEnx-1B ETOPS certification engine testing on the turbine center frame (TCF) strut 5 oil supply tube, the outer piston ring became dislodged resulting in TCF purge air leaking from the end of the air adapter. The leaking air impinged on the thrust reverser insulation blanket resulting in non-serviceable damage.
(3)Cause:
The piston ring has insufficient engagement with the piston ring groove due to wear on the shoulders of the tube fitting, resulting from side loading of the tube by the external tubes.
(4)Improvement:
The deflectors will disperse the air leaking from the end of the adapter caps diverting it back towards the engine. This will decrease the damage to the thrust reverser.
(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 engine, you will need approximately 3.0 man-hours for each engine or component.
H.Weight and Balance
The complete compliance with this Service Bulletin increases weight by 0.6 lb (0.27 kg).
I.References (Use the latest version of these documents)
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112866, GEnx-1B Illustrated Tool and Equipment Manual (ITEM)
NOTE:
The reference documents listed below are for the engine manufacturer's internal use only:
 
CID: 573138
 
BPP: 11-72-54-01
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112866, GEnx-1B Illustrated Tool and Equipment Manual (ITEM)
K.Interchangeability
Qualified interchangeability.
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
 
2474M51P01
(3)
Deflector, Adapter Cap
332.75
(1)
30
 
2474M52P01
(4)
Deflector, Adapter Cap
332.75
(1)
30
 
2474M51P02
(1)
Deflector, Adapter Cap
332.75
(1)
30
 
1519M13P11
(4)
Clamp, Hose
5.50
(5)
5
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
None.
(3)Consumables:
None.
B.Industry Support Information
Contact your Customer Support Manager (CSM) for industry Support information.
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
-/-
 
.2474M51P01
20-150, 79-22-10
10-140, 79-22-40
(3)
Deflector, Adapter Cap
(SIN 9259A)
--
(-)
AD
5/-
 
.2474M52P01
10-210, 79-22-20
(4)
Deflector, Adapter Cap
(SIN 9259B)
--
(-)
AD
5/-
 
.2474M51P02
10-150, 79-22-40
(1)
Deflector, Adapter Cap
(SIN 9259C)
--
(-)
AD
5/-
 
.1519M13P11
20-160, 79-22-10
10-220, 79-22-20
10-160, 79-22-40
(4)
Clamp, Hose
(SIN 9258A)
--
(-)
AD
5/-
Operation Codes
AD=Add
RM=Remains
Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Codes None.
D.Parts Disposition
None.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
 A.Removal of the Deflectors
(1)Remove the deflectors (3, Figure 1, Sheet 5) and hose clamp (2) at the strut 8 as follows:
(a)Remove the hose clamp (2) that secures the two deflectors (3).
 (b)Remove the two deflectors (3) from the swivel nut (454K0) and the air adapter (92509).
(2)Remove the deflectors (1 and 4, Figure 1, Sheet 4) and hose clamp (2) at the strut 7 as follows:
(a)Remove the hose clamp (2) that secures the two deflectors (1 and 4).
 (b)Remove the two deflectors (1 and 4) from the swivel nut (489K1) and the drain adapter (9250D).
(3)Remove the deflectors (3, Figure 1, Sheet 3) and hose clamp (2) at the strut 6 as follows:
(a)Remove the hose clamp (2) that secures the two deflectors (3).
 (b)Remove the two deflectors (3) from the swivel nut (454K0) and the air adapter (9250C).
(4)Remove the deflectors (1, Figure 1, Sheet 2) and hose clamp (2) at the strut 5 as follows:
(a)Remove the hose clamp (2) that secures the two deflectors (1).
 (b)Remove the two deflectors (1) from the swivel nut (443K1) and the air adapter (92509).
 B.Installation of the Deflectors
(1)Install two deflectors (1, Figure 1, Sheet 2) and a hose clamp (2) at the strut 5 as follows:
 (a)Install the two deflectors (1) around the swivel nut (443K1) and the air adapter (92509). Make sure that the corners of the swivel nut wrenching feature edges do not line up with the gaps between the two deflectors (1).
(b)Secure the deflectors (1) with a hose clamp (2). Torque the hose clamp (2) to 32-38 lb in. (3.6-4.3 Nm).
(c)Remove any excess in length of the hose clamp (2) so no more than 1.00 inch (25.4 mm) is exposed between the house clamp (2) and the screw. No burrs are permitted.
(2)Install two deflectors (3, Figure 1, Sheet 3) and a hose clamp (2) at the strut 6 as follows:
 (a)Install the two deflectors (3) around the swivel nut (454K0) and the air adapter (9250C). Make sure that the corners of the swivel nut wrenching feature do not line up with the gaps between the deflectors (3).
(b)Secure the deflectors (3) with a hose clamp (2). Torque the hose clamp (2) to 32-38 lb in. (3.6-4.3 Nm).
(c)Remove any excess in length of the hose clamp (2), so no more than 1.00 inch (25.4 mm) is exposed between the house clamp (2) and the screw. No burrs are permitted.
(3)Install a deflector (1, Figure 1, Sheet 4), a deflector (4), and a hose clamp (2) at the strut 7 as follows:
 (a)Install the deflectors (1 and 4) around the swivel nut (489K1) and the drain adapter (9250D). Make sure that the corners of the swivel nut wrenching feature do not line up with the gaps between the deflectors (1 and 4).
NOTE:
The deflector (4) is on the aft side to provide clearance to the portion of scavenge tube (454A1) of the deflector (4).
(b)Secure the deflectors (1 and 4) with a hose clamp (2). Torque the hose clamp (2) to 32-38 lb in. (3.6-4.3 Nm).
(c)Remove any excess in length of the hose clamp (2), so no more than 1.00 inch (25.4 mm) is exposed between the house clamp (2) and the screw. No burrs are permitted.
(4)Install two deflectors (3, Figure 1, Sheet 5) and a hose clamp (2) at the strut 8 as follows:
 (a)Install the two deflectors (3) around the swivel nut (454K0) and the air adapter (92509). Make sure that the corners of the swivel nut wrenching feature do not line up with the gaps between the two deflectors (1).
(b)Secure the two deflectors (3) with a hose clamp (2). Torque the hose clamp (2) to 32-38 lb in. (3.6-4.3 Nm).
(c)Remove any excess in length of the hose clamp (2), so no more than 1.00 inch (25.4 mm) is exposed between the house clamp (2) and the screw. No burrs are permitted.
Installation of Deflectors at the Struts 5, 6, 7, and 8
Figure 1   (Sheet 1)
Installation of Deflectors at the Struts 5, 6, 7, and 8
Figure 1   (Sheet 2)
Installation of Deflectors at the Struts 5, 6, 7, and 8
Figure 1   (Sheet 3)
Installation of Deflectors at the Struts 5, 6, 7, and 8
Figure 1   (Sheet 4)
Installation of Deflectors at the Struts 5, 6, 7, and 8
Figure 1   (Sheet 5)