2009-14-05 Pratt & Whitney: Amendment 39-15955. Docket No. FAA-2009- 0417; Directorate Identifier 2009-NE-13-AD.
Effective Date
(a) This airworthiness directive (AD) becomes effective July 23, 2009.
Affected ADs
(b) None.
Applicability
(c) 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:
Table 1--Affected HPC Drum Rotor Disk Assemblies
Drum Rotor Disk Assembly Part Number 1B3702; 1B3702-001; 1B3610; 1B3610-001; or 1B7377
Serial Number
12th Stage Disk Billet and Heat Number
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
R80315M1/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.
Unsafe Condition
(d) 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.
Compliance
(e) 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.
Non-Destructive Inspection(f) 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.
Alternative Methods of Compliance
(g) The Manager, Engine Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19.
Related Information
(h) Contact Mark Riley, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail:
[email protected]; telephone (781) 238-7758, fax (781) 238-7199.
Material Incorporated by Reference
(i) You must use Pratt & Whitney Alert Service Bulletin No. PW2000 A72-736, dated January 5, 2009, to have the special eddy current inspections performed by this AD. The Director of the Federal Register approved the incorporation by reference of this service bulletin in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Pratt & Whitney, 400 Main Street, East Hartford, CT 06108, for a copy of this service information. You may review copies at the FAA, New England Region, 12 New England Executive Park, Burlington, MA; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http:// www.archives.gov/federal-register/cfr/ibr-locations.html.
