AD 2018-22-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell | International Inc | Airworthiness Directives; Honeywell International Inc. Turboprop Engines |
Unsafe Condition
A TPE331-11U engine experienced an uncontained rotor separation and cracks were discovered in the bore of the second stage turbine rotor assembly after publication of AD 88-12-10.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove certain second stage turbine rotors from service at a reduced life limit. Replace the second stage turbine rotor assembly installed on TPE331-8, -10, -10N, -10R, -10U, -10UA, -10UF, -10UG, -10UGR, -10UR, and -11U model engines with a new or serviceable second stage turbine rotor assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 100 cycles-in-service for 3,301 to 4,000 cycles since new (CSN) rotors and within 50 cycles-in-service for 4,001 to 4,800 CSN rotors.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Honeywell International Inc. (Honeywell) TPE331-8, -10, -10N, -10R, -10U, -10UA, -10UF, -10UG, -10UGR, -10UR, and -11U turboprop engines with second stage turbine rotor assemblies, part number (P/Ns) 3102106-1, -6, and -8 or P/N 3101514-1, -10 and -12, installed.
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
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