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2011-25-10: High-pressure compressor (HPC) shafts

FAA order 2011-25-10 is an airworthiness directive in force since January 17, 2012. The FAA's subject line: High-pressure compressor (HPC) shafts. It names the Pratt & Whitney JT9D series engine: about 13 aircraft on the U.S. register today, 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-7R4H1
Engine series
Pratt & Whitney JT9D series 13 aircraft

Dates and paperwork

In force since
January 17, 2012
Published
December 12, 2011 (signed November 29, 2011)
Docket
FAA-2011-0731
Status
Current
The FAA's document
Read the order on the FAA's site

The FAA's summary their words, unchanged

We are adopting a new airworthiness directive (AD) for all PW JT9D-7R4H1 turbofan engines. This AD was prompted by reports of cracks in five high-pressure compressor (HPC) shafts. This AD requires removing certain HPC shafts before their certified life limits and establishes a new, lower life-limit for these parts. We are issuing this AD to correct the unsafe condition on these products.

The order itself the regulatory text, as published

Show the full text (2,919 characters)
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39--AIRWORTHINESS DIRECTIVES 0 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. Sec. 39.13 [Amended] 0 2. The FAA amends Sec. 39.13 by adding the following new airworthiness directive (AD): 2011-25-10 Pratt & Whitney Corp: Amendment 39-16886; Docket No. FAA- 2011-0731; Directorate Identifier 2010-NE-39-AD. (a) Effective Date This AD is effective January 17, 2012. (b) Affected ADs None. (c) Applicability Pratt & Whitney Corp (PW) JT9D-7R4H1 turbofan engines with a high-pressure compressor (HPC) shaft, part number (P/N) 808070 or 808071, installed. (d) Unsafe Condition This AD was prompted by reports of cracks in five HPC shafts. We are issuing this AD to correct the unsafe condition on these products. (e) Compliance Comply with this AD within the compliance times specified, unless already done. (f) Engines With an HPC Shaft, P/N 808071, That Has More Than 4,500 Cycles-Since-New (CSN) For engines with an HPC shaft, P/N 808071, that has more than 4,500 CSN on the effective date of this AD, remove the HPC shaft from service within 500 cycles-in-service (CIS) after the effective date of the AD or at piece-part exposure, whichever occurs first. (g) Engines With an HPC Shaft, P/N 808071, That Has 4,500 or Fewer CSN For engines with an HPC shaft, P/N 808071, that has 4,500 or fewer CSN on the effective date of this AD, remove the HPC shaft from service before exceeding 5,000 CSN. (h) Engines With an HPC Shaft, P/N 808070, Removal From Service For engines with an HPC shaft, P/N 808070, remove the HPC shaft, P/N 808070, from service before exceeding 1,200 CSN. (i) Installation Prohibition (1) After the effective date of this AD, do notinstall or reinstall into any engine any HPC shaft removed in accordance with paragraphs (f), (g), or (h) of this AD. (2) After the effective date of this AD, do not install or reinstall into any JT9D-7R4H1 engine: (i) Any HPC shaft, P/N 808071, that is at piece-part exposure and exceeds the new lower life limit of 5,000 CSN, or (ii) Any HPC shaft, P/N 808070, that is at piece-part exposure and exceeds the new lower life limit of 1,200 CSN. (j) Alternative Methods of Compliance (AMOCs) The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. (k) Related Information For more information about this AD, contact Stephen K. Sheely, Aerospace Engineer, Engine Certification Office, FAA, 12 New England Executive Park, Burlington, MA 01803; phone: (781) 238-7750; fax: (781) 238-7199; email: stephen.k.sheely@faa.gov. (l) Material Incorporated by Reference 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/2011-25-10.json · aircraft systems.