AD 56-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kelowna Flightcraft R & D Ltd. | 240 Series | CONVAIR Model 240, 340 and 440 Aircraft |
| aircraft | Kelowna Flightcraft R & D Ltd. | 340 | CONVAIR Model 240, 340 and 440 Aircraft |
| aircraft | Kelowna Flightcraft R & D Ltd. | 440 | CONVAIR Model 240, 340 and 440 Aircraft |
Unsafe Condition
Deficiencies in the construction of fire seals between zone 1 and zone 2 nacelle areas, leading to nacelle fires as indicated by recent accidents.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Incorporate an additional fireproof seal at the zone 1 to zone 2 shroud-to-cowl seal, improve nacelle seals with fireproof material along cowl segment junctures and hinge points, and replace aluminum chimney vent material with steel (CV-240 only).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Not later than December 31, 1957, or at the next engine change or airplane overhaul, whichever comes first.
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Affected Aircraft
Convair Model 240, 340, and 440 aircraft, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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