AD 90-23-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | DH.125 Series 1A | Airworthiness Directives; BRITISH AEROSPACE Model DH.125-1A Series Airplanes |
Unsafe Condition
Chafing between the air conditioning duct and the rear pressure bulkhead, leading to rapid decompression of the airplane.
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Required Actions
Perform a detailed visual inspection for chafing on the aft face of the rear pressure bulkhead within 30 days after the effective date. If defects are found, conduct dye penetrant and dial test indicator measurements to determine damage depth. Depending on damage depth, either blend/polish the area, repair within 100 landings, or repair immediately. Adjust the duct clamp clearance to at least 3/4-inch within 30 days.
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Compliance Time
Within 30 days after the effective date of this AD, unless previously accomplished.
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Affected Aircraft
Model DH.125-1A series airplanes equipped with Hawker Siddeley Dynamics Air Conditioning System and Rolls Royce Viper Engines, certified in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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