AD 2019-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International S | Airworthiness Directives; CFM International S.A. Turbofan Engines |
Unsafe Condition
cracks found in the rotating air HPT front seal on CFM56-5B model turbofan engines during a scheduled shop visit, resulting from variations in the geometry of the parts being mated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
replace the affected rotating air HPT front seal with a part eligible for installation, as described in CFM Service Bulletin (SB) CFM56-5B S/B 72-1074, Revision 01, dated December 5, 2018; CFM SB CFM56-5C S/B 72-0794, Revision 01, dated January 2, 2019; and CFM SB CFM56-7B S/B 72-1042, Revision 01, dated January 2, 2019.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
CFM International S.A. CFM56-5B, CFM56-5C, and CFM56-7B model turbofan engines with a certain rotating air HPT front seal.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.