 | GEnx-1B SERVICE BULLETIN - 73-0010 R01 | Revised: 01/17/2013 |
| SB 73-0010 R01 ENGINE - Propulsor Module Assembly (72-00-00) - Introduction of New FCOC Support Bracket Redesign | Issued: 01/31/2012 | |
| GEnx-1B SERVICE BULLETIN - 73-0010 R01 | Revised: 01/17/2013 |
| SB 73-0010 R01 ENGINE - Propulsor Module Assembly (72-00-00) - Introduction of New FCOC Support Bracket Redesign | Issued: 01/31/2012 | |
| TRANSMITTAL INFORMATION |
| REVISION 1 TO SERVICE BULLETIN 73-0010 |
| Revision 1 is issued to update paragraphs 1.K., Interchangeability and 2.A., Material - Price and Availability. |
| The original was issued January 31, 2012. Revision bars in the left margin identify the change. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
|
| This Service Bulletin has been introduced in production to these GEnx-1B engines: |
| • |
|
| These serial numbers are the best available data. |
| B. | Description |
| This Service Bulletin provides a new hardware and releases an improved system of brackets that support the fuel cooled oil cooler (FCOC) on the GEnx-1B engine. |
| C. | Compliance |
| Category 7 |
| GE recommends that you do this Service Bulletin at customer's convenience. |
| NOTE: |
|
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To introduce new parts, improve maintainability, and reduce weight. |
| (2) | Condition: |
| The current type design FCOC support brackets are heavy and overly designed. In addition, the current brackets are difficult to assemble and disassemble on the engine and can lead to damaged hardware. |
| (3) | Cause: |
| The current bracket design was generated prior to the collection of engine data. The measured system response on unbalanced engines has provided the insight to generate an optimized design. |
| (4) | Improvement: |
| The redesigned brackets perform equal to or better than the current bracket system. |
| (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 VSFG heat exchanger, you will need approximately 5.0 man-hours for each engine or component. |
| H. | Weight and Balance |
| The complete compliance with this Service Bulletin decreases weight by 1.9 lb (0.86 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: |
|
| J. | Publications Affected |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| The new brackets are interchangeable on engine as a set, with the current support bracket system. Mixing the proposed and superseded hardware on 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: |
|
| *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 AD=Add DE=Delete RE=Replace RM=Remains QTC=Quantity Change |
| Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Codes B=Old parts will be supplied until all old parts are sold. E=Old parts will be supplied, and can be used at other engine locations. |
| D. | Parts Disposition |
| Use serviceable old parts for engines that have not changed. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Removal of the FCOC Hardware |
| (1) | Removal instructions for the FCOC hardware have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, DISASSEMBLY 003, and 72-30-00, DISASSEMBLY 001. |
| B. | Installation of New FCOC Hardware |
| (1) | Attach the support bracket (1, Figure 1, Sheet 6) on the forward flange of the extension case (10-080, 72-30-00) as follows: |
| (a) | Apply a thin layer of C02-058 lubricant to the threads and pressure faces of six machine bolts (2) and six self-locking nuts (05-011). |
| (b) | Attach the support bracket (1), nutplates aft, with the six machine bolts (2), boltheads aft, and self-locking nuts (05-011) on the aft face of the extension case forward flange at boltholes No. 94 thru No. 99. Hand-tighten the self-locking nuts (05-011). |
| (c) | Torque the self-locking nuts (05-011) or machine bolts (2) to 368-432 lb in. (41.6-48.8 Nm) in a criss-cross pattern. |
| (d) | Torque the self-locking nuts (05-011) or machine bolts (2) again to 368-432 lb in. (41.6-48.8 Nm) in a circular pattern. |
| (2) | Attach the support bracket (3, Sheet 7) on the forward flange of the extension case (10-080) as follows: |
| (a) | Apply a thin layer of C02-058 lubricant to the threads and pressure faces of five machine bolts (4). |
| (b) | Attach the support bracket (3) with the five machine bolts (4), bolthead aft, on the aft face of the extension case forward flange at boltholes No. 84 thru 88. Hand-tighten the machine bolts (4). |
| (c) | Torque the five machine bolts (4) to 276-324 lb in. (31.2-36.6 Nm). |
| (d) | Torque the five machine bolts (4) again to 368-432 lb in. (41.6-48.8 Nm). |
| (3) | Attach the FCOC bracket (5, Sheet 6) to the extension case (10-080) as follows: |
| (a) | Apply C02-058 lubricant to the mating surfaces and threads on two machine bolts (6). |
| (b) | Attach the FCOC bracket (5) with two machine bolts (6), bolthead forward, and two self-locking nuts (33-080) on the forward face of the extension case aft flange at boltholes No. 101 and 102. Hand-tighten the self-locking nuts (33-080). |
| (c) | Torque the two self-locking nuts (33-080) to 368-432 lb in. (41.6-48.8 Nm). |
| (d) | Torque the two self-locking nuts (33-080) again to 368-432 lb in. (41.6-48.8 Nm). |
| (4) | Attach the FCOC modification bracket (7, Sheet 7) to the extension case (10-080) aft flange as follows: |
| (a) | Apply C02-058 lubricant to the mating surfaces and threads on four machine bolts (8). |
| (b) | Attach the FCOC modification bracket (7) with four machine bolts (8), 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 Nm). |
| (d) | Torque the four self-locking nuts (33-080) again in a circular pattern to 368-432 lb in. (41.6-48.8 Nm). |
| (5) | Attach the support bracket (9, Sheet 6) on the support bracket (1) that is installed on the extension case (10-080) at the 9:15 o'clock position with a machine bolt (10), a flat wire spring (11), and sliders (12 and 13). |
| (a) | Torque the machine bolt (10) to 106-124 lb in. (12.0-14.0 Nm). |
| (6) | Attach the FCOC support bracket (14, Sheet 7) on the support brackets (3 and 7) that are installed on the extension case (10-080) with two machine bolts (10), flat wire springs (11), and sliders (12 and 13). |
| (a) | Torque the machine bolts (10) to 106-124 lb in. (12.0-14.0 Nm). |
| (7) | Install the VFSG heat exchanger (01-010, 73-11-20, Sheet 9) to the extension case (10-080) as follows: |
| (a) | Attach the VFSG heat exchanger to the support bracket (14) with two machine bolts (01-030). |
| (b) | Attach the VFSG heat exchanger to the support bracket (9) with a machine bolt (15). |
| (c) | Attach the VFSG heat exchanger to the support bracket (5) with a machine bolt (16). |
| (8) | Torque the machine bolts (01-030) to 175-205 lb in. (19.8-23.2 Nm). |
| (9) | Torque the machine bolts (15 and 16) to 368-432 lb in. (41.5-48.8 Nm). |
| (10) | Install the VFSG heat exchanger fuel system, signal fuel tubes and hoses, fan hub frame lube supply, and turbine center frame/turbine rear frame lube supply. Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 004. |
