AD 73-26-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 500 | Airworthiness Directives; CESSNA Model 500 Airplanes |
Unsafe Condition
Cracks in the left and right flight compartment side windows (P/Ns 5511265-3 and -4) at attachment locations could lead to failure of the window panes, compromising pressurization integrity.
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Required Actions
Inspect windows using x-ray or visual inspection per Cessna SL56-2 or approved method. Replace unairworthy windows if cracks progress past retainer edges, interconnect three screw holes, exceed three inches in length, or total cracks exceed six inches. Inspect every 100 hours if cracks exist but do not meet replacement criteria. Discontinue requirements after installing P/N 5511285-3/-4 per SB56-4.
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Compliance Time
within the next 25 hours' time in service after October 9, 1974, and thereafter every 200 hours' time in service (or 100 hours if cracks are found but not requiring replacement)
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Affected Aircraft
Cessna Model 500 airplanes (Serial Numbers 500-0001 through 500-0183) with 400 or more hours' time in service.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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