AD 73-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | R172E | Airworthiness Directives; CESSNA Model R172E (T-41B) Airplanes |
Unsafe Condition
Complete loss of engine power when using the fuel boost pump due to the fuel pump boost electrical circuit design.
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Required Actions
Install a new boost pump switch, electrical resistors, and placard in accordance with Cessna Service Letter No. SE73-24 and Service Kit SK172-43, or later FAA-approved revisions, or any equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.
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Compliance Time
Within 50 hours' time in service after the effective date of this AD
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Affected Aircraft
Cessna Model R172E (T-41B) airplanes with serial numbers R172-0001 through R172-0256
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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