AD 77-10-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-31-325 | Airworthiness Directives; Piper Model PA-31-325 Airplanes |
Unsafe Condition
Possible adverse airplane vibration effects at higher altitudes
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Attach the operating limitation placard on the pilot's instrument panel between the clock and airspeed indicator stating 'Above 21,000 feet reduce Vno speed 3 m.p.h. per 1000 feet'
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 25 hours in service after the effective date of this Airworthiness Directive
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Piper Model PA-31-325 Airplanes
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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