AD 92-27-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; De Havilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; De Havilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; De Havilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; De Havilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; De Havilland Model DHC-7 Series Airplanes |
Unsafe Condition
Reduced structural integrity of the engine nacelles due to missing rivets securing the upper longerons in each inner engine nacelle.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct an inspection within 6 months after January 22, 1993, to determine if rivets securing the upper longerons in each inner engine nacelle were installed per Service Bulletin 7-54-9. If rivets are missing, accomplish Modification No. 7/1707 before further flight. Operators may seek alternative methods via the FAA if approved.
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
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
De Havilland Model DHC-7 series airplanes with serial numbers 1 through 7, inclusive, and 9, 10, and 11.
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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