Airworthiness Directive · Amendment 39-15955 · Pratt & Whitney Models PW2037, PW2037(M), and PW2040 Turbofan Engines
Pratt & Whitney Models PW2037, PW2037(M), and PW2040 Turbofan Engines
This AD applies to Pratt & Whitney models PW2037, PW2037(M), and PW2040 turbofan engines, with the following high-pressure compressor (HPC) drum rotor disk assemblies installed:
| Drum Rotor Disk Assembly Part No. 1B3702; 1B3702-001; 1B3610; 1B3610-001; or 1B7377— Serial No. | 12th Stage Disk Billet and Heat No. |
|---|---|
| T62805 | T/LALY-4013 |
| R80293 | T/LALY-4012 |
| R80289 | T/LALY-4010 |
| R80322 | T/LALY-4009 |
| R80330 | T/LALY-4008 |
| R78394 | T/LALY-4007 |
| R80281 | T/LALY-4006 |
| R80304 | T/LALY-4005 |
| R80343 | T/LALY-4004 |
| R80299 | T/LALY-4003 |
| R80313 | T/LALY-4002 |
| R80333 | M1/LALY-4035 |
| R80324 | M1/LALY-4034 |
| R80310 | M1/LALY-4033 |
| R80326 | M1/LALY-4030 |
| R80305 | M1/LALY-4026 |
| R80315 | M1/LALY-4025 |
| R80309 | M1/LALY-4024 |
| R80341 | M1/LALY-4023 |
| R80329 | M1/LALY-4022 |
| R80312 | M1/LALY-4020 |
| R80321 | M1/LALY-4019 |
| R80319 | M2/LALY-4040 |
| R80358 | M2/LALY-4039 |
| R80302 | M2/LALY-4038 |
| R80336 | M2/LALY-4037 |
These engines are installed on, but not limited to, Boeing 757-200 and 757-300 airplanes.
The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney models PW2037, PW2037(M), and PW2040 turbofan engines. This AD requires 12th stage disks of certain high-pressure compressor (HPC) drum rotor disk assemblies, to be inspected for cracks by Pratt & Whitney using a special eddy current inspection procedure. This AD results from six HPC 12th stage disks found cracked during HPC module disassembly at overhaul. We are issuing this AD to prevent uncontained failure of the HPC 12th stage disk and airplane damage.
You are responsible for having the actions required by this AD performed at the following compliance times:
(1) For PW2040 turbofan engines, within 200 cycles-in-service (CIS) after the effective date of this AD, unless the actions have already been done.
(2) For PW2037 and PW2037(M) turbofan engines, within 400 CIS after the effective date of this AD, unless the actions have already been done.
Have a special eddy-current inspection performed on the 12th stage disks installed in the HPC drum rotor disk assemblies listed in Table 1 of this AD, for cracks. Use paragraph 1 of the Accomplishment Instructions of Pratt & Whitney Alert Service Bulletin No. PW2000 A72-736, dated January 5, 2009, to do the special eddy current inspection.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
