2017-14545: Airworthiness Directives; CFM International S.A. Turbofan Engines
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We are adopting a new airworthiness directive (AD) for certain CFM International S.A. (CFM) CFM56-3, -3B, and -3C turbofan engines. This AD was prompted by a report of dual-engine loss of thrust control (LOTC) that resulted in an air turn back. This AD requires initial and repetitive checks of the variable stator vane (VSV) actuation system in the high-pressure compressor (HPC). We are issuing this AD to address the unsafe condition on these products.
The agency’s own summary, as published.
What this changes
Amends 1 part of the Code of Federal Regulations — the standing rules this notice rewrites.
Rulemaking docket
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Proposed Rule March 09, 2017Airworthiness Directives: CFM International S.A. Turbofan Engines
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Rule July 14, 2017Airworthiness Directives: CFM International S.A. Turbofan Engines
Public comments
What people are saying
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Anonymous Anonymous 2017-04-27
“The attached files are the following supporting docket-related documents: U.S. DOT/FAA - Regulatory Evaluation Form U.S. DOT/FAA - Service information U.S. DOT/FAA - Notice of proposed rulemaking”
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Rikki Gardonio 2017-04-24
“Attached is the comment submitted on behalf of the Air Line Pilots Association, Int'l. Thank you”
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PAUL QUIRK 2017-04-21
“Jet.com have the following comments regarding the proposal to expand the effectivity of the AD, and hence the requirements of CFM SB 72-1169 to all CFM56-3 engines. While not expected that any of the engines currently operating in the Jet2.com fleet would ultimately require removal for repair, the maintenance burden in carrying out the inspections and if required, pull tests, to us as an operator would appear to be an unnecessary addition to our maintenance program. The FAA Determination states that "the unsafe condition (due to VSV bore corrosion) described previously is likely to exist or...”
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Anonymous Anonymous 2017-04-18
“Fleet: X2 B737-300 Engines CFM56-3 Re: CFM Service Bulletin 72-1169. It is noted in the PLANNING INFORMATION 1. A Effectivity that this region (Bahrain) is not included in the operating region for the effectivity of aircraft /engines affected by the SB. Currently my fleet operate on a Boeing LUMP (Low utilisation maintenance programme) based on approximately 40 flight hrs per month and we operate in a highly corrosive atmosphere. I accept that the Middle East is a region of above average temperatures and dry atmosphere but Bahrain is a small island surrounded by the Gulf Ocean and the parki...”
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Anonymous Anonymous 2017-04-12
“If the engine was flying in noted climate locations listed in the SB 72-1169 Rev 1 and two years later does not fly any longer in the noted climate locations, is that means that the SB will not be effective any longer as corrosion will stop progressing further around the VSV bores?”
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