AD 93-11-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
Unsafe Condition
Degradation of the structural capabilities of the nose landing gear drag strut attachment fitting due to the use of MS rivets.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the six MS rivets with hi-strength Hi-Lok fasteners per Modification 7/2572 and Service Bulletin 7-53-32. For airplanes with serial numbers 3 through 27, install a new outer drag strut attachment fitting per Modification 7/1328 and Service Bulletins 7-53-31 and Notice of Status Change 7-53-31-1. Alternative methods may be approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 6 months after the effective date of this AD (July 22, 1993).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
De Havilland DHC-7 series airplanes (models DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, DHC-7-103) certificated in any category.
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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