AD 73-22-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 340 | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 401 | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 401A | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 401B | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 402 | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 402A | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 402B | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 411 | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 411A | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 414 | Airworthiness Directives; CESSNA Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B Airplanes |
Unsafe Condition
Fuel collection in the wing leading edge area could lead to fire or structural damage.
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Required Actions
Install Cessna Service Kit SK421-56 to modify the wing leading edge, and install applicable checklist and Flight Manual revisions as specified in Cessna Service Letter ME73-5 (Supplement 1) or later FAA-approved revisions.
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Compliance Time
within the next 100 hours' time in service after the effective date of this AD
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Affected Aircraft
Cessna Models 340, 401, 401A, 401B, 402, 402A, 402B, 411, 411A, 414, 421, 421A, 421B with specified serial number ranges, except Model 421 S/N 421-0151 if compliant with STC SA599CE.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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