AD 93-02-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-1 | Airworthiness Directives; DE HAVILLAND Model DHC-6-1/100/200/300 Airplanes |
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives; DE HAVILLAND Model DHC-6-1/100/200/300 Airplanes |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives; DE HAVILLAND Model DHC-6-1/100/200/300 Airplanes |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives; DE HAVILLAND Model DHC-6-1/100/200/300 Airplanes |
Unsafe Condition
Failure of the elevator support assembly, 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
Within the next 25 hours time-in-service (TIS), inspect floor structure channel members (part numbers C6FS1229-37 and C6FS1229-31) for cracks around the lower pivot bearing housing. Inspect top and bottom flanges of hydraulic hand pump fitting (part number C6FSM1293-27) for cracks behind the front bolt boss. Repair or replace cracked components per SB 6/348. Incorporate Modification 6/1594 within 2,400 hours TIS unless already done.
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Compliance Time
Within the next 25 hours time-in-service (TIS), unless already accomplished within the last 175 hours TIS, and thereafter at intervals not to exceed 200 hours TIS until Modification No. 6/1594 is incorporated. Incorporate Modification 6/1594 within the next 2,400 hours TIS.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
DE HAVILLAND Model DHC-6-1/100/200/300 airplanes (serial numbers 2 through 494, 497 through 503, 505, and 507) that have not incorporated Modification 6/1594 per SB 6/348.
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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