AD 72-12-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 401 | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 401A | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 401B | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 402 | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 402A | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 402B | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
Unsafe Condition
Chafing of fuel lines with possible fire hazard due to fuel leakage in the wing leading edge.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect fuel crossfeed lines for chafing at firewall vertical stiffeners, replace chafed fuel lines with serviceable parts, install fuel line support clamps per Cessna Service Letters ME68-6 or ME68-27, maintain minimum clearance, replace firewall access plate screws, and use specified screws for firewall vertical stiffeners.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 50 hours' time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Cessna Models 401 and 402 series airplanes with serial numbers 401-0001 thru 401B0216 and 402-0001 thru 402B0220, excluding specific serial numbers listed in the AD.
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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