AD 94-14-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; de Havilland Model DHC-8-100 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; de Havilland Model DHC-8-100 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | Airworthiness Directives; de Havilland Model DHC-8-100 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | Airworthiness Directives; de Havilland Model DHC-8-100 Series Airplanes |
Unsafe Condition
Pilot valve leakage of hydraulic fluid in the landing gear selector valve, combined with a low voltage condition at the selector valve down solenoid, could result in inadvertent retraction of the landing gear.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the hydraulic selector valve to determine the rate of leakage of hydraulic fluid per S.B. A8-32-117. Replace the valve with a serviceable valve if leakage exceeds specified thresholds (100, 1,000, 1,500 cc/min), with compliance times ranging from immediately to 300 hours time-in-service. Replace with improved valve (part number 57420-5) to terminate AD requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 300 hours time-in-service after the effective date of this AD, unless accomplished previously. Subsequent inspections at intervals not to exceed 10,000 hours time-in-service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
de Havilland Model DHC-8-100 series airplanes; serial numbers 003 through 038 inclusive; equipped with landing gear selector valve, part number 57420 or 57420-3.
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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