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2005-05-13: High pressure turbine (HPT) second stage airseals

FAA order 2005-05-13 is an airworthiness directive in force since April 14, 2005. The FAA's subject line: High pressure turbine (HPT) second stage airseals. It names the Pratt & Whitney JT9D-59A, Pratt & Whitney JT9D series engines: about 14 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.

What it applies to as the FAA lists it

Kind of product: Engine
Makes: Pratt & Whitney Division
Models: JT9D-59A, JT9D-70A, JT9D-7Q, JT9D-7Q3
Engine series: Pratt & Whitney JT9D-59A 1 aircraft
Pratt & Whitney JT9D series 13 aircraft

Dates and paperwork

In force since: April 14, 2005
Published: March 10, 2005 (signed March 2, 2005)
Docket: 2001-NE-27-AD
Replaces: 2002-10-07
Status: Current
The FAA's document: Read the order on the FAA's site

The FAA's summary their words, unchanged

The FAA is superseding an existing airworthiness directive (AD) for Pratt & Whitney (PW) JT9D-59A, -70A, -7Q, and -7Q3 turbofan engines. That AD currently requires fluorescent penetrant inspection (FPI) of high pressure turbine (HPT) second stage airseals, part numbers (P/Ns) 5002537-01, 788945, 753187, and 807410, knife-edges for cracks, each time the engine's HPT second stage airseal is accessible. This AD requires replacing each existing HPT second stage airseal with an improved design HPT second stage airseal and modifying the 2nd stage HPT vane cluster assembly and 1st stage retaining blade HPT plate assembly at next piece-part exposure, but no later than five years after the effective date of this AD. These actions are considered terminating action to the repetitive inspections required by AD 2002- 10-07. This AD results from the manufacturer introducing an improved design HPT second stage airseal and modifications to increase cooling. We are issuing this AD to prevent failure of the HPT second stage airseal due to cracks in the knife-edges, which if not detected, could result in uncontained engine failure and damage to the airplane.

The order itself the regulatory text, as published

Show the full text (2,991 characters)

2005-05-13 Pratt & Whitney: Amendment 39-14002. Docket No. 2001-NE- 27-AD. 

Effective Date 

	(a) This AD becomes effective April 14, 2005. 

Affected ADs 

	(b) This AD supersedes AD 2002-10-07, Amendment 39-12753. 

Applicability 

	(c) This AD applies to Pratt & Whitney (PW) JT9D-59A, -70A, -7Q, and -7Q3 turbofan engines with high pressure turbine (HPT) second stage airseal, part number (P/N) 5002537-01, 788945, 753187, or 807410, installed. These engines are installed on, but not limited to, Airbus Industrie A300 series, Boeing 747 series, and McDonnell Douglas DC-10 series airplanes. 

Unsafe Condition 

	(d) This AD results from the manufacturer introducing an improved design HPT second stage airseal and modifications to increase cooling. We are issuing this AD to prevent failure of the HPT second stage airseal due to cracks in the knife-edges, which if not detected, could result in uncontained engine failure and damage to the airplane. 

Compliance 

	(e)You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. 

Replacement of HPT Second Stage Airseal 

	(f) At the next piece-part exposure, but no later than five years after the effective date of this AD, replace the HPT second stage airseal with a P/N HPT second stage airseal that is not listed in this AD, and modify the 2nd stage HPT vane cluster assembly and 1st stage retaining blade HPT plate assembly. Use the Accomplishment Instructions of PW Service Bulletin No. JT9D 6454, Revision 3, dated November 9, 2004, to do this. 

Definition 

	(g) For the purposes of this AD, piece-part exposure means the HPT second stage airseal disk is considered completely disassembled, when done in accordance with the disassembly instructions in the engine manufacturer's, or other FAA-approved engine manual. 

Alternative Methods of Compliance 

	(h) 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. 

Material Incorporated by Reference 

	(i) You must use Pratt & Whitney Service Bulletin No. JT9D 6454, Revision 3, dated November 9, 2004, to perform the replacement and modification required 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. You can get a copy from Pratt & Whitney, 400 Main St., East Hartford, CT 06108; telephone (860) 565-8770; fax (860) 565-4503. You can review copies at the FAA, New England Region, Office of the Regional Counsel, 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/code_of_federal_regulations/ibr_locations.html .Related Information 

	(j) None.

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 7, 2026. Connections as data: /graph/directive/2005-05-13.json · aircraft systems.