AD 90-25-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-7 Series Airplanes |
Unsafe Condition
Possible malfunction of the right main landing gear (MLG) due to undetected damage to the frame and attachment bolts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 100 landings after May 29, 1990, and every 500 landings thereafter, conduct a visual inspection of the right MLG frame and bolts per Service Bulletin 7-24-66 Rev B. If damage is found, replace parts before further flight. Install Modification 7/2577 within 180 days after January 14, 1991, to relocate the external power grounding stud.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 100 landings after May 29, 1990 (for inspections) and within 180 days after January 14, 1991 (for modification installation).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Of Canada, Ltd., De Havilland Division Model DHC-7 series airplanes, 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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