AD 90-21-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 180 | Airworthiness Directives; CESSNA Model 180 Airplanes |
| aircraft | Cessna Aircraft Company | 180A | Airworthiness Directives; CESSNA Model 180 Airplanes |
| aircraft | Cessna Aircraft Company | 180B | Airworthiness Directives; CESSNA Model 180 Airplanes |
| aircraft | Cessna Aircraft Company | 180C | Airworthiness Directives; CESSNA Model 180 Airplanes |
| aircraft | Cessna Aircraft Company | 180D | Airworthiness Directives; CESSNA Model 180 Airplanes |
| aircraft | Cessna Aircraft Company | 180E | Airworthiness Directives; CESSNA Model 180 Airplanes |
| aircraft | Cessna Aircraft Company | 180F | Airworthiness Directives; CESSNA Model 180 Airplanes |
| aircraft | Cessna Aircraft Company | 180G | Airworthiness Directives; CESSNA Model 180 Airplanes |
| aircraft | Cessna Aircraft Company | 180H | Airworthiness Directives; CESSNA Model 180 Airplanes |
| aircraft | Cessna Aircraft Company | 180J | Airworthiness Directives; CESSNA Model 180 Airplanes |
Unsafe Condition
Undetected fuel loss and erroneous fuel gauging may occur after an inadvertent icing encounter due to over the wing (cabin) primary fuel vents.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a placard on the instrument panel within 100 hours time-in-service; modify or install fuel tank bladder with vent relocation if left fuel bladder is removed; alternate compliance may be approved by FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 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 Model 180 airplanes (Serial Numbers 30000 thru 32487) equipped with over the wing (cabin) primary fuel vents.
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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