AD 90-05-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-301 | Airworthiness Directives; De Havilland Model DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; De Havilland Model DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-315 | Airworthiness Directives; De Havilland Model DHC-8-300 Series Airplanes |
Unsafe Condition
Cracks or complete separation of the bleed air precooler mounting lugs could cause rupture of the engine bleed air ducts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 50 hours time-in-service after the effective date, and every 50 hours time-in-service thereafter, perform a visual inspection for cracks or separation of the mounting lugs per de Havilland Alert Service Bulletin A8-21-32. If more than one lug has cracks or any lug is separated, repair before further flight per the same service bulletin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 hours time-in-service after the effective date of this AD, and thereafter at intervals not to exceed 50 hours time-in-service
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Affected Aircraft
De Havilland Model DHC-8-301, DHC-8-311, DHC-8-315 airplanes, serial numbers 100 through 231 inclusive
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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