**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: 0 7/23/2012 Issued: 07/23/2012**SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster Anti Ice Air Duc** **t**

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. P age 1 of 5is 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: 0 7/23/2012 Issued: 07/23/2012**SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster Anti Ice Air Duc** **t**

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. P age 2 of 5H. 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 U** **nit ($) 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: 0 7/23/2012 Issued: 07/23/2012**SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster Anti Ice Air Duc** **t**

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. P age 3 of 53. 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- 0 30) 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: 0 7/23/2012 Issued: 07/23/2012**SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster Anti Ice Air Duc** **t**

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. P age 4 of 5Inspection of the BAI Air Duct Figure 1 **GEnx-2B Service Bulletin** No 75-0006 R00 Revised: 0 7/23/2012 Issued: 07/23/2012**SB 75-0006 R00 AIR - Booster Anti-Ice Valve (75-11-30) - Inspection of Booster Anti Ice Air Duc** **t**

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. P age 5 of 5