AD 74-03-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kelowna Flightcraft R & D Ltd. | 240 Series | Airworthiness Directives; GENERAL DYNAMICS Model 240 Series and T- 29B Airplanes |
Unsafe Condition
Cracks in pilot and co-pilot window frame castings (P/N 240-3110314-6 and -7) could result in failure in flight and consequent rapid decompression.
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Required Actions
Inspect castings for cracks using General Dynamics Service Bulletin 600 (240D) S.B. No. 53-2A or approved method. Replace cracked castings with new parts (P/N 240-3110314-6/-7) either prior to further flight if completely severed, or within 250 flight hours if not severed, with interim zero cabin pressure operation.
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Compliance Time
Within 250 hours' time in service after the effective date (February 4, 1947) for castings with 4500+ hours, or prior to 4750 hours' time in service for those with less. Subsequent inspections at intervals not exceeding 1000 hours' time in service.
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Affected Aircraft
GENERAL DYNAMICS Model 240 Series and T-29B airplanes modified under STC SA1054WE.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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