GE PROPRIETARY INFORMATION

The information contained in this document is GE proprietary 

information and is disclosed in confidence. It is the property of GE 

and shall not be used, disclosed to others or reproduced without the 

express written consent of GE, including, but without limitation, it 

is not to be used in the creation, manufacture, development, or 

derivation of any repairs, modifications, spare parts, designs, or 

configuration changes or to obtain FAA or any other government or 

regulatory approval to do so. If consent is given for reproduction in 

whole or in part, this notice and the notice set forth on each page 

of this document shall appear in any such reproduction in whole or in 

part.

This technical data is considered EAR controlled pursuant to 15 CFR 

Parts 730-774 respectively. Transfer of this data by any means to a 

Non-US Person, whether in the United States or abroad, without the 

proper U.S. Government authorization (e.g., License, exemption, NLR, 

etc.), is strictly prohibited.

Copyright (2012) General Electric Company, U.S.A.

1. PLANNING INFORMATION

A. Effectivity

* * * GEnx-2B67B

This Service Bulletin is applicable to all GEnx-2B67B engines.

The booster anti-ice (BAI) air duct P/N 2469M32G01 is affected 

by this Service Bulletin.

B. Description

This Service Bulletin provides a visual inspection of the BAI 

air duct P/N 2469M32G01 for cracks.

C. Compliance

Category 2

GE recommends that you do this Service Bulletin as soon as 

possible without effect on revenue service but before 400 

cycles since new (CSN) and thereafter at an interval of 100 

cycles until the part is replaced with a new part. If the part 

GEnx-2B Service Bulletin No 75-0006 R00

Revised: 

07/23/2012 Issued: 07/23/2012

SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster AntiIce Air Duct

Date Printed: 

Jan 9, 2013

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

1 of 5
is replaced with a new part, the initial inspection on the new 

part will be at 400 CSN of operation on the new part and 

thereafter at an interval of 100 cycles.

If the engine has exceeded 400 flight CSN on the installed 

part at the time this Service Bulletin is released, the 

initial inspection should be completed within 20 cycles of the 

release of this Service Bulletin.

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 operator’s fleet.

D. Concurrent Requirements

None.

E. Reason

(1) Objective:

To introduce a reduced interval inspection to identify 

cracks on the BAI air duct.

(2) Condition:

Cracks can occur at the forward end of the duct and in an 

aft bend.

(3) Cause:

The root cause for the cracking is under investigation.

(4) Improvement:

The improvement is under development.

(5) Substantiation:

Substantiation is by analysis and test.

F. Approval

This Service Bulletin contains no modification information 

that revises the approved configuration and therefore does not 

require FAA approval.

G. Manpower

After you get access to the BAI air duct, you will need 

approximately 20 minutes to do the inspection portion of this 

Service Bulletin. If the duct has to be replaced, you will 

need approximately 2 man-hours.

GEnx-2B Service Bulletin No 75-0006 R00

Revised: 

07/23/2012 Issued: 07/23/2012

SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster AntiIce Air Duct

Date Printed: 

Jan 9, 2013

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

2 of 5
H. Weight and Balance

Weight and balance are not changed.

I. References (Use the latest version of these documents)

D633U8101, GEnx-2B Boeing 747-8 Aircraft Maintenance Manual 

(AMM)

J. Publications Affected

None.

K. Interchangeability

Not applicable.

L. Software Accomplishment Summary

Not applicable.

2. MATERIAL INFORMATION

A. Material - Price and Availability

(1) Parts necessary to do this Service Bulletin:

None.

(2) Other Spare Parts:

Part Number 

Qty/ 

Eng Part Name 

Unit ($) 

Price 

Pkg 

Qty 

Lead 

Time 

Days 

2469M32G01 (1) Duct, BAI Air 9,505.00 (1) 30 

AS1895/23-150 (2) Seal, Ring 75.50 (1) 30 

NOTE: These parts are listed for planning purposes and are only required if the 

inspection reveals a cracked condition of the BAI air duct.

NOTE: Prices are provided for planning purposes and are subject to change.

(3) Consumables:

None.

B. Industry Support Information

Contact your Customer Support Manager (CSM) for industry 

support information.

C. Configuration Chart

None.

D. Parts Disposition

None.

E. Tooling - Price and Availability

None.

GEnx-2B Service Bulletin No 75-0006 R00

Revised: 

07/23/2012 Issued: 07/23/2012

SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster AntiIce Air Duct

Date Printed: 

Jan 9, 2013

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

3 of 5
3. ACCOMPLISHMENT INSTRUCTIONS

A. General

(1) Read the entire instructions in this Service Bulletin before 

starting to work on the engine.

(2) Disassembly of engine components is not necessary to do this 

Service Bulletin.

(3) Send the results of the inspection to the local GE Field 

Service Representative with the information that follows:

• Time Since New (TSN) of the engine.

• CSN of the engine.

• Number of locations where the cracks were found.

• Direction of the cracks (longitudinal or circumferential).

• Approximate length of the cracks.

B. Inspection

(1) Find the BAI air duct (01-030, 75-11-30) connected to the 

BAI valve (01-090). Refer to Figure 1.

(2) Do an inspection of the BAI air duct (01-030) as follows. 

Refer to the GEnx-2B Boeing 747-8 AMM, TASK 75-11-00-200-

801-G00.

NOTE: A flexible borescope can be used to help to access to the area and provide 

a better visibility by magnification. This is an optional requirement.

(a) Do an inspection of the BAI air duct (01-030) for 

circumferential cracks at the forward end of the BAI air 

duct, close to the BAI valve (01-090).

(b) Do an inspection of the entire length of the BAI air duct 

(01-030) for cracks. No cracks are permitted in the BAI 

air duct.

(3) Replace the BAI air duct (01-030) if cracks are found. Refer 

to the GEnx-2B Boeing 747-8 AMM, TASK 75-11-03-000-801-G00 

and TASK 75-11-03-400-801-G00.

(4) Send the results of the inspection to the local GE Field 

Service and Boeing Field Service Engineers.

(5) If cracks are found in the BAI air duct, do an inspection of 

the engine externals, pylon areas within the forward engine 

core area, and thrust reverser components. Refer to the 

GEnx-2B Boeing 747-8 AMM. 

(6) Replace any part that does not agree with the inspection 

criteria of the GEnx-2B Boeing 747-8 AMM.

GEnx-2B Service Bulletin No 75-0006 R00

Revised: 

07/23/2012 Issued: 07/23/2012

SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster AntiIce Air Duct

Date Printed: 

Jan 9, 2013

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

4 of 5
Inspection of the BAI Air Duct 

Figure 1 

GEnx-2B Service Bulletin No 75-0006 R00

Revised: 

07/23/2012 Issued: 07/23/2012

SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster AntiIce Air Duct

Date Printed: 

Jan 9, 2013

GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or 

reproduced without the express written consent of GE. Technical data 

is considered ITAR and/or EAR controlled; transfer of this data to a 

Non-US Person, without USG authorization, is strictly prohibited.

Page 

5 of 5