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2012-22-16: 3rd stage LPT duct segments

FAA order 2012-22-16 is an airworthiness directive in force since December 19, 2012. The FAA's subject line: 3rd stage LPT duct segments. It names the Pratt & Whitney PW4052, Pratt & Whitney PW4056, Pratt & Whitney PW4060, Pratt & Whitney PW4062, Pratt & Whitney PW4062A, Pratt & Whitney PW4158, Pratt & Whitney PW4460, Pratt & Whitney PW4462 engines: about 131 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: PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, PW4650
Engine series: Pratt & Whitney PW4052 1 aircraft
Pratt & Whitney PW4056 25 aircraft
Pratt & Whitney PW4060 14 aircraft
Pratt & Whitney PW4062 6 aircraft
Pratt & Whitney PW4062A 2 aircraft
Pratt & Whitney PW4158 65 aircraft
Pratt & Whitney PW4460 10 aircraft
Pratt & Whitney PW4462 8 aircraft

Dates and paperwork

In force since: December 19, 2012
Published: November 14, 2012 (signed October 29, 2012)
Docket: FAA-2012-0546
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 Pratt & Whitney Division PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, and PW4650 turbofan engines, including models with any dash number suffix. This AD was prompted by 16 reports of damaged or failed 3rd stage low-pressure turbine (LPT) duct segments. This AD requires removing from service certain part numbers (P/Ns) of 3rd stage LPT duct segments. We are issuing this AD to prevent failure of the 3rd stage LPT duct segments, which could lead to LPT rotor damage, uncontained engine failure, and damage to the airplane.

The order itself the regulatory text, as published

Show the full text (3,177 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): 

2012-22-16 Pratt & Whitney Division: Amendment 39-17253 ; Docket No. FAA-2012-0546; Directorate Identifier 2012-NE-15-AD. 

(a) Effective Date 

	This AD is effective December 19, 2012. 

(b) Affected ADs 

	None. 

(c) Applicability 

	This AD applies to all Pratt & Whitney Division PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, and PW4650 turbofan engines, including models with any dash number suffix, with 3rd stage low-pressure turbine (LPT) duct segments partnumbers (P/Ns) 50N095; 50N095-001; 50N235; 50N235-001; 50N494-01; 50N494-001; 50N495-01; or 50N495-001, installed. 

(d) Unsafe Condition 

	This AD was prompted by 16 reports of damaged or failed 3rd stage LPT duct segments. We are issuing this AD to prevent failure of the 3rd stage LPT duct segments, which could lead to LPT rotor damage, uncontained engine failure, and damage to the airplane. 

(e) Compliance 

	Comply with this AD within the compliance times specified, unless already done. 

(f) 3rd Stage LPT Duct Segments Removal from Service 

	At the next piece-part exposure after the effective date of this AD, remove from service 3rd stage LPT duct segments, P/Ns 50N095; 50N095-001; 50N235; 50N235-001; 50N494-01; 50N494-001; 50N495-01; and 50N495-001. 

(g) Installation Prohibition 

	After the effective date of this AD, do not install into any engine any 3rd stage LPT duct segment, P/N 50N095; 50N095-001; 50N235; 50N235-001; 50N494-01; 50N494-001; 50N495-01; or 50N495-001, that is at piece-part exposure. 

(h) Definition 

	For the purpose of this AD, piece-part exposure is when the 3rd stage LPT duct segment is removed from the engine and completely disassembled. 

(i) Alternative Methods of Compliance (AMOCs) 

	The Manager, Engine Certification Office, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request. 

(j) Related Information 

	(1) For more information about this AD, contact James Gray, Aerospace Engineer, Engine & Propeller Directorate, FAA, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7742; fax: 781-238-7199; email: james.e.gray@faa.gov. 
	(2) Pratt & Whitney Engine-Duct Segment, Third Stage LPT Assembly Service Bulletin No. PW4ENG 72-488 is related to this AD. 
	(3) For service information identified in this AD, contact Pratt & Whitney, 400 Main St., East Hartford, CT 06108; phone: 860-565- 8770; fax: 860-565-4503. You may review copies ofthe service information at the FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the availability of this material at the FAA, call 781-238-7125. 

(k) 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/2012-22-16.json · aircraft systems.