FAA orders · airworthiness directive · current

2010-09-14: Exhaust gas temperature (EGT)

FAA order 2010-09-14 is an airworthiness directive in force since June 8, 2010. The FAA's subject line: Exhaust gas temperature (EGT). It names the CFM International CFM56-5B3/P, CFM International CFM56-5B4/P, CFM International CFM56-5B5/P, CFM International CFM56-5B6/P, CFM International CFM56-5B7/P, CFM International CFM56 series engines: about 766 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: CFM International, S.A.
Models: CFM56-5B1/2P, CFM56-5B1/P, CFM56-5B2/2P, CFM56-5B2/P, CFM56-5B3/2P, CFM56-5B3/2P1, CFM56-5B3/P, CFM56-5B3/P1, CFM56-5B4/2P, CFM56-5B4/2P1, CFM56-5B4/P, CFM56-5B4/P1, CFM56-5B5/P, CFM56-5B6/2P, CFM56-5B6/P, CFM56-5B7/P, CFM56-5B8/P, CFM56-5B9/2P, CFM56-5B9/P
Engine series: CFM International CFM56-5B3/P 11 aircraft
CFM International CFM56-5B4/P 22 aircraft
CFM International CFM56-5B5/P 14 aircraft
CFM International CFM56-5B6/P 10 aircraft
CFM International CFM56-5B7/P 1 aircraft
CFM International CFM56 series 708 aircraft

Dates and paperwork

In force since: June 8, 2010
Published: May 4, 2010 (signed April 23, 2010)
Docket: FAA-2008-1353
Replaces: 2009-01-01
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. CFM56-5B series turbofan engines. That AD requires reviewing exhaust gas temperature (EGT) monitoring records to determine EGT margin deterioration, and for airplanes where both engines have greater than 80 centigrade (C) of EGT margin deterioration, borescope-inspecting the high-pressure compressor (HPC) of both engines. That AD also requires removing from service any engine that does not pass the borescope inspection and, if both engines pass, replacing one of the engines with an engine that has 80 C or less of EGT margin deterioration. That AD also requires continuous monitoring of EGT margin deterioration on engines in service to prevent two engines on an airplane from having greater than 80 C of EGT margin deterioration. This AD: Reduces the number of engine models affected; Continues to monitor EGT margin deterioration; Lowers the EGT margin threshold from 80 C to 75 C; Removes FADEC software version 5.B.Q and earlier versions from the engine as mandatory terminating action to the continuous EGT margin deterioration monitoring, for certain engine models; Removes the requirement to borescope inspect; and Removes the requirement to replace one of the engines with an engine that has 80 C or less deterioration of EGT margin as a corrective action. This AD results from a reduction of the affected engine models listed in AD 2009-01-01 from 25 to 19, a reduction in the engine EGT margin deterioration threshold from 80 C to 75 C, the introduction of terminating action to the continuous EGT monitoring for certain engines, and a change to the removal plan for the remaining engines if the EGT margin deterioration is greater than 75 C. We are issuing this AD to prevent HPC stalls, which could prevent continued safe flight or landing.

The order itself the regulatory text, as published

Show the full text (5,285 characters)

2010-09-14 CFM International, S.A.: Amendment 39-16279. Docket No. FAA-2008-1353; Directorate Identifier 2008-NE-46-AD. 

Effective Date 

	(a) This airworthiness directive (AD) becomes effective June 8, 2010. 

Affected ADs 

	(b) This AD supersedes AD 2009-01-01, Amendment 39-15779. 

Applicability 

	(c) This AD applies to CFM International, S.A. CFM56-5B1/P, - 5B2/P, -5B3/P, -5B3/P1, -5B4/P, -5B5/P, -5B6/P, -5B7/P, -5B8/P, - 5B9/P, -5B1/2P, -5B2/2P, -5B3/2P, -5B3/2P1, -5B4/2P, -5B4/P1, -5B6/ 2P, -5B4/2P1, and -5B9/2P turbofan engines. These engines are installed on, but not limited to, Airbus A318, A319, A320, and A321 series airplanes. 

Unsafe Condition 

	(d) This AD results from a reduction of the affected engine models listed in AD 2009-01-01 from 25 to 19, a reduction in the engine exhaust gas temperature (EGT) margin deterioration threshold from 80 C to 75 C, the introduction of terminating action to the continuous EGT monitoring for certain engines, anda change to the removal plan for the remaining engines if the EGT margin deterioration is greater than 75 C. We are issuing this AD to prevent high-pressure compressor stalls, which could prevent continued safe flight or landing. 

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) On the effective date of this AD, and at any time after the effective date of this AD, for CFM International, S.A. CFM56-5B1/P, -5B2/P, -5B3/P, -5B3/P1, -5B4/P, -5B4/P1, -5B5/P, -5B6/P, -5B7/P, - 5B8/P and -5B9/P turbofan engines: 
	(1) Monitor and calculate engine EGT margin deterioration. Use paragraphs 3.A.(2) and 3.A.(3) of the Accomplishment Instructions and Appendix A of CFM International, S.A. Alert Service Bulletin (ASB) No. CFM56-5B S/B 72-A0722, Revision 1, dated March 20, 2009, to do the monitoring and calculating. 
	(2) As mandatory terminating action to the repetitive recalculating and monitoring of EGT margin deterioration, remove FADEC software version 5.B.Q and earlier versions from engines that have greater than 75 C of EGT margin deterioration within 150 additional cycles-in-service (CIS). 
	(3) As mandatory terminating action to the repetitive recalculating and monitoring of EGT margin deterioration, remove FADEC software version 5.B.Q and earlier versions from engines that have less than or equal to 75 C of EGT margin deterioration within 900 additional CIS. 
	(g) On the effective date of this AD, and at any time after the effective date of this AD, for CFM International, S.A. CFM56-5B1/2P, -5B2/2P, -5B3/2P, -5B3/2P1, -5B4/2P, -5B4/2P1, -5B6/2P and -5B9/2P turbofan engines: 
	(1) Monitor and calculate engine EGT margin deterioration. Use paragraphs 3.A.(2) and 3.A.(3) of the Accomplishment Instructions and Appendix A of CFM International, S.A. ASB No. CFM56-5B S/B 72- A0722, Revision 1, dated March 20, 2009, to do the monitoring and calculating. 
	(2) Remove engines from service that have greater than 75 C of EGT margin deterioration within 150 additional CIS. 

Installation Prohibitions 

	(h) For engines listed in paragraph (f) of this AD, after the effective date of this AD, do not install FADEC software version 5.B.Q or any earlier software versions. 
	(i) For engines listed in paragraph (g) of this AD, after the effective date of this AD, do not install an engine that has greater than 75 C of EGT margin deterioration. 

Interim Actions 

	(j) These actions are interim actions and we anticipate further rulemaking actions in the future, including further action to address the remaining engines in service that are above 75 C deterioration of EGT margin. 

Alternative Methods of Compliance (AMOCs) 

	(k) 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. 

Related Information 

	(l) Refer toEuropean Aviation Safety Agency Airworthiness Directive 2009-0088, Revision 1, dated April 28, 2009, for related information. 
	(m) Contact Wayne Maguire, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; e-mail: [email protected]; telephone (781) 238-7778; fax (781) 238-7199, for more information about this AD. 

Material Incorporated by Reference 

	(n) You must use CFM International, S. A. Alert Service Bulletin No. CFM56-5B S/B 72-A0722, Revision 1, dated March 20, 2009, to perform the EGT calculating and monitoring 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. Contact CFM International, S.A., Technical Customer Support, 1 Neumann Way, Cincinnati, OH 45215; telephone (513) 552-3272; fax (513) 552-3329, Web address http:// customer.geae.com, for a copy ofthis 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.

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 November 6, 2026. Connections as data: /graph/directive/2010-09-14.json · aircraft systems.