AD 77-09-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 421B | Airworthiness Directives; CESSNA Models 421B and 421C Airplanes |
| aircraft | Cessna Aircraft Company | 421C | Airworthiness Directives; CESSNA Models 421B and 421C Airplanes |
Unsafe Condition
Separation of the pilot's or co-pilot's windshields from the aircraft
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Required Actions
Inspect and repair the pilot's and co-pilot's windshield installations per Cessna Service Letter ME77-5 and attachments, using specially trained personnel; or restrict operation to unpressurized cabin by securing the pressurization switch and installing a placard. Equivalent methods require FAA approval.
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Compliance Time
Within 50 hours' time in service after the effective date for aircraft with 50+ hours' time in service or upon accumulation of 100 hours' time in service for those with 49 or fewer hours' time in service
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Affected Aircraft
Cessna Models 421B (Serial Numbers 421B0301 thru 421B0970 except 421B0463, 421B0663, 421B0962) and 421C (Serial Numbers 421C0001 thru 421C0272 except 421C0224, 421C0232, 421C0246, 421C0260, 421C0261, 421C0264 thru 421C0271)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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