 | GEnx-1B SERVICE BULLETIN - 75-0004 R01 | Revised: 08/30/2018 |
| SB 75-0004 R01 AIR - Eductor Valve and Air Tubes (75-24-40) - Introduction of New Air Tube, Bracket Eductor, and FCOC Bracket Design | Issued: 06/25/2012 | |
| GEnx-1B SERVICE BULLETIN - 75-0004 R01 | Revised: 08/30/2018 |
| SB 75-0004 R01 AIR - Eductor Valve and Air Tubes (75-24-40) - Introduction of New Air Tube, Bracket Eductor, and FCOC Bracket Design | Issued: 06/25/2012 | |
| 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 (2018) General Electric Company, U.S.A. |
| TRANSMITTAL INFORMATION |
| REVISION 1 TO SERVICE BULLETIN 75-0004 |
| Revision 1 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS. |
| The original was issued June 25, 2012. Revision bars in the left margin identify changes. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
| * * * FOR GEnx-1B64, -1B64/P1, -1B67, -1B67/P1, -1B70, -1B70/75/P1, -1B70/P1, -1B74/75/P1 |
| This Service Bulletin is applicable to all GEnx-1B engines. |
| This change is introduced in the first quarter of 2012, in complete engine sets, in production. |
| The air tube P/N 2352M19G01, bracket eductor P/N 2326M62G01, and FCOC bracket P/N 2424M97G01 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin releases an optimized air tube P/N 2469M15G01, bracket eductor P/N 2469M18G01, and FCOC bracket P/N 2469M29G01 redesign. |
| C. | Compliance |
| Category 7 |
| GE recommends that you do this Service Bulletin at customer's convenience. |
| Impact E |
| This recommendation is to improve the cost of ownership, reduce maintenance requirements or is a product improvement. |
| NOTE: |
|
| D. | Concurrent Requirements |
| Do the GEnx-1B S/B 73-0010 before you do this Service Bulletin. |
| E. | Reason |
| (1) | Objective: |
| To introduce new parts and improve reliability. |
| (2) | Condition: |
| The current air tube P/N 2352M19G01 was designed with three one to one bends that have three complex welds. |
| (3) | Cause: |
| The air tube P/N 2352M19G01 designed was developed to standardize hardware, incorporating a standard four bolts flange, thus the one to one bends are needed. |
| (4) | Improvement: |
| The elimination of one of the three one to one bends in the air tube P/N 2469M15G01 will improve producibility by eliminating three complex welds and reducing the part process time. The bracket eductor P/N 2469M18G01 and FCOC bracket P/N 2469M29G01 are redesign to incorporate this change. |
| (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 |
| No additional man-hours are required to comply with this Service Bulletin. |
| H. | Weight and Balance |
| The complete compliance with this Service Bulletin increases weight by 0.103 lb (0.047 kg). |
| I. | References (Use the latest version of these documents) |
| GEK 9250, Commercial Engine Standard Practices Manual (SPM) |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| GEnx-1B S/B 73-0010, ENGINE - Propulsor Module Assembly (72-00-00) - Introduction of New FCOC Support Bracket Redesign |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| The tube assembly and two brackets must be interchanged as a complete engine set, mixing the proposed and superseded hardware in the same engine 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: |
|
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| *Part not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase. |
| NP = Not Provisioned |
| NOTE: |
|
| (2) | Other Spare Parts: |
| None. |
| (3) | Consumables: |
|
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| Operation Codes RE=Replace RM=Remains |
| Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Code B=Old parts will be supplied until all old parts are sold. |
| D. | Parts Disposition |
| Use serviceable old parts for engines that have not changed. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Removal. |
| (1) | Removal instructions for the air tube (1, Figure 1) have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 003, Subtask 72-00-02-030-436. |
| (2) | Removal instructions for the bracket eductor (2) have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 003, Subtask 72-00-02-030-437. |
| (3) | Remove the FCOC bracket (3) as follows: |
| (a) | Remove four self-locking nuts (33-080, 72-00-02) and four machine bolts (33-070B, 72-00-02) that attach the FCOC bracket (3) to the extension case (10-080). |
| B. | Installation. |
| (1) | Install the FCOC bracket (3, Figure 1) to the extension case (10-080, 72-00-02) aft flange as follows: |
| WARNING: |
|
| (a) | Apply C02-058 lubricant to the mating surfaces and threads on four machine bolts (33-070B, 72-00-02). |
| (b) | Attach the FCOC bracket (3) with four machine bolts (33-070B, 72-00-02), bolthead aft, and four self-locking nuts (33-080) on the forward face of the extension case aft flange at boltholes No. 91 thru 94. Hand tighten the self-locking nuts (33-080). |
| (c) | Torque the four self-locking nuts (33-080) in a criss-cross pattern to 368-432 lb in. (41.6-48.8 N.m). |
| (d) | Torque the four self-locking nuts (33-080) again in a circular pattern to 368-432 lb in. (41.6-48.8 N.m). |
| (2) | Install the bracket eductor (2) as follows: |
| (a) | Attach the bracket eductor (2) to the FCOC bracket (3) with two bolts (01-080). Install the bolts (01-080) in the most forward holes. Hand tighten the bolts (01-080). |
| (b) | Torque the bolts (01-080) to 106-124 lb in. (12.0-14.0 N.m). |
| (3) | Install the air tube (1) as follows: |
| (a) | Install a new ring seal (01-050, 75-24-40) on the end of the air tube (1). |
| (b) | Install the air tube (1) on the extension case (10-080, 72-30-00) at the 9:00 o'clock position. Attach the tube with four bolts (01-040, 75-24-40). |
| (c) | Attach the air tube (1) to the bracket (2) with a retaining strap (01-090) and bolts (01-080). |
| (d) | Attach the air tube (1) to the bracket (01-120) with a retaining strap (01-090). Attach them with the bolts (01-100) that were installed before. |
| (e) | Torque the bolts (01-040) to 106-124 lb in. (12.0-14.0 N.m) in a criss-cross pattern. |
| (f) | Torque the bolts (01-080) and bolts (01-100) to 106-124 lb in. (12.0-14.0 N.m). |
| (g) | Install a new ring seal (01-050) on the end of the sump eductor valve (01-010). |
| (h) | Connect the sump eductor valve (01-010) to the air tube (1) with a coupling clamp (01-170). Install the coupling clamp with the hinge forward and the nut outboard. |
| (i) | Torque the coupling clamp (01-170) to 60 to 70 lb in. (6.7 to 7.9 Nm). |
