AD 78-11-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 210M | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
| aircraft | Cessna Aircraft Company | 310R | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
| aircraft | Cessna Aircraft Company | 340A | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
| aircraft | Cessna Aircraft Company | 402B | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
| aircraft | Cessna Aircraft Company | 404 | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
| aircraft | Cessna Aircraft Company | 414 | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
| aircraft | Cessna Aircraft Company | 414A | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
| aircraft | Cessna Aircraft Company | 421C | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
| aircraft | Cessna Aircraft Company | P210N | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
| aircraft | Cessna Aircraft Company | P210R | Airworthiness Directives; CESSNA Model 210M, T210M, P210, 310R, T310R, 340A , 402B, 404, 414, 414A, and 421C |
Unsafe Condition
Failure of the autopilot actuator to disengage when the autopilot is disconnected, causing increased flight control forces.
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Required Actions
Disable the Model 400B autopilot by pulling and banding circuit breakers or disconnecting connectors, install a locally fabricated placard indicating 'AUTOPILOT INOPERATIVE', and perform the electrical autopilot actuator modification per Cessna Service Letter No. AV78-6 to return the autopilot to service.
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Compliance Time
before next flight
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Affected Aircraft
Cessna Models 210M, T210M, P210 (Serial Numbers 21061574-21062583, P2100001-P2100010); 310R, T310R (Serial Numbers 310R0501-310R1302, 310R1304-310R1315, 310R1317, 310R1318); 340A (Serial Numbers 340A0001-340A0458, 340A0460-340A0466, 340A0468, 340A0470-340A0483); 402B (Serial Numbers 402B1001-402B1331, 402B1333-402B1338); 404 (Serial Numbers 404-0001-404-0218, 404-0220-404-0222); 414, 414A (Serial Numbers 414-0801-414-0965, 414A0001-414A0032, 414A0034-414A0038, 414A0040-414A0047); 421C (Serial Numbers 421C0001-421C0479, 421C0481-421C0488) with ARC Model 400B autopilot installations.
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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