AD 97-23-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-1 | Airworthiness Directives; de Havilland DHC-6 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives; de Havilland DHC-6 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives; de Havilland DHC-6 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives; de Havilland DHC-6 Series Airplanes |
Unsafe Condition
Failure of the fuselage due to cracks in the fuselage side frames at Fuselage Station (FS) 218.125 and FS 219.525, which could result in loss of control of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the fuselage side frames at FS 218.125 and FS 219.525 with improved materials (Modifications 6/1461 and 6/1462) as terminating action for repetitive inspections. Inspect fuselage side frame flanges for cracks and repair or replace any cracked parts immediately.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 4,800 hours time-in-service (TIS) after the effective date of the AD (December 22, 1997)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Viking Air Limited DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300 airplanes without Modification Nos. 6/1461 and 6/1462 incorporated.
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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