AD 81-01-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31T | Airworthiness Directives; Piper Model PA-31T and Piper PA-31T1 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-31T1 | Airworthiness Directives; Piper Model PA-31T and Piper PA-31T1 Airplanes |
Unsafe Condition
Loss of propeller and intake lip deicing functions due to improper installation of DC relay PRD7DYD (24 VDC).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for proper propeller and intake lip deice power relay per Piper telegraphic form letter #31-28 dated December 22, 1980, or equivalent approved by Chief, Engineering and Manufacturing Branch. If P/N 484247 relay is installed, check for correct DC relay PRD7DYD (24 VDC). If not installed, remove and install proper relay prior to further flight in known icing conditions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to further flight in known icing conditions
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Piper Model PA-31T (S/N 8120008, 8120009, 8120010, 8120013) and PA-31T1 (S/N 8104007, 8104008, 8104009, 8104010, 8104011, 8104012, 8104013)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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