AD 80-02-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; DeHavilland Model DHC-7 Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; DeHavilland Model DHC-7 Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; DeHavilland Model DHC-7 Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; DeHavilland Model DHC-7 Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; DeHavilland Model DHC-7 Airplanes |
Unsafe Condition
Looseness of the main landing gear frame attachment bolts could cause landing gear support structure failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 25 hours after the effective date, inspect main landing gear frame bolts (P/N MS21250H10042) for improper torque. If improper torque is found, cut access holes at all four bolt locations, retorque bolts to 1400-1650 inch-pounds, install snap hole plugs, mark components with a red line, and inspect markings every 320 hours until modification via Service Bulletin 7-54-4 is done. Properly torqued bolts must also be marked and inspected similarly until modification. The modification must be accomplished within 1900 hours from the initial inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 25 hours in service after the effective date of this AD, unless previously accomplished within the last 295 hours in service
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Affected Aircraft
DeHavilland Model DHC-7 airplanes, serial numbers 1 through 13 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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