AD 2018-22-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Engine Alliance | Turbofan | Airworthiness Directives; Engine Alliance Turbofan Engines |
Unsafe Condition
The incorrect installation of the stage 6 seal ring created a leakage path from the aft cavity to the forward cavity of the HPC stage 6 disk, which elevated the temperature in the cavity and adversely affected the material properties of the HPC stages 2-5 spool.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the stage 6 seal ring for correct installation and inspect the HPC stages 2-5 spool for cracks. Remove and replace the HPC stages 2-5 spool if the stage 6 seal ring is incorrectly installed or the interstage 5-6 seal teeth are found cracked.
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
Engine Alliance GP7270, GP7272, and GP7277 model turbofan engines.
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.