FAA orders · airworthiness directive · current

2007-24-04: Low pressure turbine (LPT)

FAA order 2007-24-04 is an airworthiness directive in force since December 6, 2007. The FAA's subject line: Low pressure turbine (LPT). It names the CFM International CFM56-5C4/1 engine: about 1 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: CFM International, S.A.
Models: CFM56-5C4/1
Engine series: CFM International CFM56-5C4/1 1 aircraft

Dates and paperwork

In force since: December 6, 2007
Published: November 21, 2007 (signed November 14, 2007)
Docket: FAA-2007-0108
Replaces: 2001-17-14
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 CFM International, S.A. CFM56-5C4/1 series turbofan engines. That AD currently requires that the low pressure turbine (LPT) conical support, part number (P/N) 337-002-407-0, be removed from service at or before reaching the cyclic life limit of 9,350 cycles-since-new (CSN). This AD requires that the same P/N LPT conical support be removed from service before reaching the new, relaxed cyclic life limit of 20,000 CSN. This AD results from CFM International, S.A. performing a life extension study of the LPT conical support, P/N 337-002-407-0. We are issuing this AD to prevent LPT conical supports from remaining in service beyond their certified cyclic life limit, which could result in an uncontained engine failure and damage to the airplane.

The order itself the regulatory text, as published

Show the full text (1,988 characters)

2007-24-04 CFM International, S.A.: Amendment 39-15270. Docket No. FAA-2007-0108; Directorate Identifier 2001-NE-15-AD. 

Effective Date 

	(a) This airworthiness directive (AD) becomes effective December 6, 2007. 

Affected ADs 

	(b) This AD supersedes AD 2001-17-14, Amendment 39-12405. 

Applicability 

	(c) This AD applies to CFM International, S.A. CFM56-5C4/1 series turbofan engines with low pressure turbine (LPT) conical support, part number (P/N) 337-002-407-0, installed. These engines are installed on, but not limited to, Airbus A340 series airplanes. 

Unsafe Condition 

	(d) This AD results from CFM International, S.A. performing a life extension study of the LPT conical support, P/N 337-002-407-0. We are issuing this AD to prevent LPT conical supports from remaining in service beyond their certified cyclic life limit, which could result in an 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. 

	(f) Remove LPT conical support, P/N 337-002-407-0, at or before accumulating 20,000 cycles-since-new (CSN) and replace with a serviceable part. 
	(g) After the effective date of this AD, do not install any LPT conical support, P/N 337-002-407-0, with 20,000 or more CSN, into CFM56-5C4/1 series turbofan engines. 

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) None. 

Related Information 

	(j) Contact Stephen Sheely, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: stephen.k.sheely@faa.gov; telephone (781) 238-7750; fax (781) 238-7199, for more information about this AD.

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 5, 2026. Connections as data: /graph/directive/2007-24-04.json · aircraft systems.