AD 73-19-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives; de Havilland Aircraft of Canada, Ltd., Model DHC-6 Series 100,200 and 300 Aircraft |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives; de Havilland Aircraft of Canada, Ltd., Model DHC-6 Series 100,200 and 300 Aircraft |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives; de Havilland Aircraft of Canada, Ltd., Model DHC-6 Series 100,200 and 300 Aircraft |
Unsafe Condition
Inadvertent auto-feathering of the propeller system could occur, which may lead to loss of control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Deactivate the auto-feather system by disconnecting the circuit breaker marked 'PROP AUTO-FEATHER', install a placard stating 'Auto-feather System Deactivated' near the select switch, and revise the Vmc speed on the airspeed limitation placard to specified values for each series. Accomplish de Havilland Modifications 6/1472 and 6/1459 or an equivalent approved modification to nullify this AD.
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Compliance Time
within 200 hours after the effective date of this AD unless already accomplished
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Affected Aircraft
de Havilland Aircraft of Canada, Ltd. Model DHC-6 Series 100 and 200, Serial Numbers 6 through 230 inclusive with propeller auto-feather system installed per Modification No. 6/1278 or STC SA2608WE; Series 300 Serial Numbers 130, 210, 231 through 290 inclusive (excluding 265, 270, 277, 281, 283)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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