1.PLANNING INFORMATION
A.Effectivity
* * * FOR GEnx-1B64, -1B67, -1B70, -1B64/P1, -1B67/P1, -1B70/P1, -1B70/75/P1
This Service Bulletin is applicable to these GEnx-1B engines:
•
GEnx-1B engines, serial numbers 956-110, 956-111, 956-115, 956-116, 956-117, 956-118, 956-119, 956-120, 956-122, 956-123, 956-124, 956-125, 956-126, 956-127, 956-128, 956-129, 956-130, 956-140, 956-141, 956-142, 956-143 thru 956-150, 956-151, 956-154, 956-155, 956-157, 956-160 thru 956-166, 956-167, 956-168, 956-169, 956-171, 956-172, 956-173, 956-174, 956-175, 956-176 thru 956-178, 956-181 thru 956-188, 956-192, 956-194 thru 956-196.
This Service Bulletin does not apply to the following:
•
This change was incorporated on production engines 956-109, 956-112 thru 956-114, 956-121, 956-156, 956-199, 956-201, 956-202, 956-203, 956-218 and up.
These serial numbers are the best available data.
B.Description
This Service Bulletin introduces two machine bolts P/N AS3237-08 and flat washers P/N AN960C416 to the Engine Illustrated Parts Catalog (EIPC) and Engine Manual (EM) and provides installation procedures for machine bolts and flat washers on a boss on the aft side of the fan hub frame near the 9:00 oclock aft looking forward (ALF) location.
C.Compliance
Category 2
GE recommends that you do this Service Bulletin as soon as possible without effect on revenue service but before 350 cycles or 180 days.
NOTE:
This Service Bulletin can be accomplished on wing.
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.
D.Concurrent Requirements
None.
E.Reason
(1)Objective:
Introduce hardware to plug two open insert holes on the aft side of the fan hub frame.
(2)Condition:
The open holes permit air flow through a fire wall.
(3)Cause:
Engineering drawing oversight.
(4)Improvement:
The added hardware seals the open holes in the fire wall.
(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 fan hub frame module, you will need approximately 0.30 man-hours for each engine to complete the hardware installation.
H.Weight and Balance
The complete compliance with this Service Bulletin increases weight by 0.038 lb (0.017 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: 573809
 
BPP: 12-72-26-01
J.Publications Affected
GEK 112851, GEnx-1B Engine Manual (EM)
GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC)
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
 
AS3237-08*
(2)
Bolt, Machine
NP
(-)
--
 
AN960C416*
(2)
Washer, Flat
NP
(-)
--
*Part not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase.
NP = Not Provisioned
NOTE:
Prices are provided for planning purposes and are subject to change.
(2)Other Spare Parts:
None.
(3)Consumables:
 
Code Number
Description
 
C02-058
Compound, Thread Lubricating (anti-seize compound)
 
C04-035
Solvent, General (isopropyl alcohol)
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
 
2305M31G04
/G12-G15
(X)
Fan Hub Frame
2305M31G04
/G12-G15
(X)
RM
-/-
 
.AS3237-08
01-510, 72-26-00
(2)
Bolt, Machine
(SIN 8402C)
--
(-)
AD
5/-
 
.AN960C416
01-520, 72-26-00
(2)
Washer, Flat
(SIN 8404C)
--
(-)
AD
5/-
Operation Codes
AD=Add
RM=Remains
Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability.
Support Code None.
D.Parts Disposition
None.
E.Tooling - Price and Availability
None.
3.ACCOMPLISHMENT INSTRUCTIONS
A.Getting access to the fan hub frame
(1)Move the variable stator vanes (VSV) to the open position. Refer to GEnx-1B Boeing 787, AMM DMC-B787-A-G71-00-00-53B-110B-A.
(2)Remove the cooling air duct (05-010, 75-23-10) as follows. Refer to Figure 1.
(a)Remove the hose clamp (05-080A) and disconnect the cooling air duct (05-010) from the exciter cooling manifold (05-020).
(b)Remove the hose clamp (05-080A) and disconnect the cooling air duct (05-010) from the exciters cooling tube (05-040).
(c)Remove the hose clamp (05-075) and disconnect the cooling air duct (05-010) from the core cooling air plug (05-050).
(d)Remove the hose clamp (05-075) and disconnect the cooling air duct (05-010) from the CAC air tube (05-030).
(e)Remove the hose clamp (05-070A) and disconnect the cooling air duct (05-010) from the configuration box (01-010, 73-21-55).
(f)Remove the hose clamp (05-060, 75-23-10) and remove the cooling air duct (05-010) from the VBV air duct (01-190).
(g)Keep all the removed parts for later installation.
B.Installation of the new machine bolts and flat washers
(1)Install the new machine bolts (1, Figure 2) and flat washers (2) as follows:
WARNING:
REFER TO THE PRODUCT LABEL AND THE MANUFACTURERS (MATERIAL) SAFETY DATA SHEET FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING AND PROPER USE OF THIS PRODUCT.
(a)Clean the threads of the inserts on the fan hub frame (10-400, 72-25-00) with isopropyl alcohol (C04-035) and a cotton swab.
(b)Install the flat washers on the machine bolts.
(c)Apply anti-seize (C02-058) to the threads of the two machine bolts.
(d)Install the machine bolts and flat washers into the open inserts on the fan hub frame.
(e)Torque the machine bolts to 109-121 lb in. (12.3-13.7 N.m).
C.Installation of the removed parts
(1)Put the hose clamp (05-060, 75-23-10) on the VBV air duct (01-190) and connect the cooling air duct (05-010) with all its outlets aligned with their tubes to the VBV air duct (01-190). Move the hose clamp (05-060) to position on the cooling air duct (05-010). Do not torque the hose clamp at this time.
(2)Put the hose clamp (05-070A) on the configuration box (01-010, 73-21-55) and connect the cooling air duct (05-010, 75-23-10) to the configuration box. Move the hose clamp (05-070A) to position on the cooling air duct (05-010). Do not torque the hose clamp at this time.
(3)Put the hose clamp (05-075) on the CAC air tube (05-030) and connect the cooling air duct (05-010) to the CAC air tube (05-030). Move the hose clamp (05-075) to position on the cooling air duct (05-010). Do not torque the hose clamp at this time.
(4)Put the hose clamp (05-075) on the core cooling air plug (05-050) and connect the cooling air duct (05-010) to the core cooling air plug (05-050). Move the hose clamp (05-075) to position on the cooling air duct (05-010). Do not torque the hose clamp at this time.
(5)Put the hose clamp (05-080A) on the exciter cooling manifold (05-020) and connect the cooling air duct (05-010) to the exciter cooling manifold (05-020). Move the hose clamp (05-080A) to position on the cooling air duct (05-010). Do not torque the hose clamp at this time.
(6)Put the hose clamp (05-080A) on the exciters cooling tube (05-040) and connect the cooling air duct (05-010) to the exciters cooling tube (05-040). Move the hose clamp (05-080A) to position on the cooling air duct (05-010). Do not torque the hose clamp at this time.
(7)Torque the hose clamp (05-060), hose clamp (05-070A), hose clamps (05-075), and hose clamps (05-080A) to 32-38 lb in. (3.6-4.3 N.m).
(8)Move the variable stator vanes (VSV) to the closed position. Refer to GEnx-1B Boeing 787, AMM DMC-B787-A-G71-00-00-53B-110B-A.
Getting Access to the Fan Hub Frame
Figure 1   (Sheet 1)
Getting Access to the Fan Hub Frame
Figure 1   (Sheet 2)
Getting Access to the Fan Hub Frame
Figure 1   (Sheet 3)
Installation of New Machine Bolts and Flat Washers
Figure 2   (Sheet 1)
Installation of New Machine Bolts and Flat Washers
Figure 2   (Sheet 2)