AD 74-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 310Q | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 340 | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 402B | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 414 | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 421B | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
Unsafe Condition
Main landing gear trunnion failure due to cracks or forming flaws in the main landing gear assemblies within specified serial number blocks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect main landing gear assemblies for specified serial numbers and check trunnions for cracks or flaws per Cessna Service Letter ME74-14. Repeat inspections every 25 hours' time in service until trunnions are replaced. Replace affected main landing gear upper struts within 100 hours' time in service or if cracks/flaws are found before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours' time in service after the effective date of this AD for initial inspections; repeat every 25 hours' time in service. Replace affected parts within 100 hours' time in service.
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Affected Aircraft
Cessna Models 310Q (Serial Numbers 1038 through 1069, 1071 through 1081, 1083 through 1086, 1088 through 1105, 1107, 1109, 1110, 1112, 1113, 1115 through 1118, 1122, 1123, 1125 and 1126); Model 340 (Serial Numbers 0325 through 0354); Model 402B (Serial Numbers 0575 through 0581, 0583 through 0586, 0588, 0590 through 0611, 0613, 0614 and 0617); Model 414 (Serial Numbers 0503 through 0529, 0531 and 0532); and Model 421B (Serial Numbers 0322, 0584 through 0625, 0627, 0629 through 0633, 0635 and 0636).
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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