AD 81-01-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bendix Avionics | Primary Servo | Airworthiness Directives; BENDIX AVIONICS: Applies to M-4 (A, B, C, D) Autopilot Primary Servo Models 3013E, 3013F, 3013G, 3013H, 3013J and 3013K and YD-4 Yaw Damper Primary Servos Models 3013J and 3013K having magnetic clutch, P/N 717503-0001, Serial Numbers 16750 through 18396 |
Unsafe Condition
Failure of the primary servo due to seizure of the magnetic clutches (P/N 717503-0001, Serial Numbers 16750 through 18396).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and modify the affected primary servos in accordance with Bendix Service Bulletin M-4D-060, dated November 1980, or an equivalent manner approved by the FAA.
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Compliance Time
Within the next 50 hours time in service after the effective date of this AD
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Affected Aircraft
Bendix Avionics M-4 (A, B, C, D) Autopilot Primary Servo Models 3013E, 3013F, 3013G, 3013H, 3013J, 3013K and YD-4 Yaw Damper Primary Servos Models 3013J and 3013K with magnetic clutch P/N 717503-0001, Serial Numbers 16750 through 18396, installed, repaired or overhauled after January 1, 1979, without Modification Number 4.
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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