AD 93-06-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-102 | Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-103 | Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-301 | Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-311 | Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-7-1 | Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-7-100 | Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-7-101 | Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-7-102 | Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-7-103 | Airworthiness Directives; De Havilland Models DHC-7, DHC-8-102, DHC-8-103, DHC-8-301, and DHC-8-311 Series Airplanes |
Unsafe Condition
Loss of both hydraulic systems due to depletion of hydraulic fluid.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove existing Quantity Limiting Valves (QLV) from left- and right-hand inboard nacelles and modify or replace them with new QLV (Modification 7/2610 for DHC-7 or 8/1803 for DHC-8 series) per applicable Service Bulletin. Compliance may be adjusted with FAA approval.
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Compliance Time
Within 1,000 hours time-in-service or 6 months after May 12, 1993, whichever occurs first (for DHC-7 and certain DHC-8 models). For DHC-8 models with less than 6,700 hours or 50 months since manufacture, comply before 7,700 hours or 12 months after May 12, 1993.
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Affected Aircraft
De Havilland Models DHC-7 (serials 003-113), DHC-8-102 (003-321), DHC-8-103 (003-321), DHC-8-301 (100-320), and DHC-8-311 (100-320) series airplanes.
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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