AD 92-27-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; De Havilland All Model DHC-7 Series Airplanes |
Unsafe Condition
Freezing of the elevator servo drum assembly could lead to an uncommanded pitch excursion with the autopilot engaged and reduced controllability of the aircraft.
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Required Actions
Install a water deflector onto the front spar of the vertical stabilizer over the elevator servo assembly per Modification No. 7/2605 and Service Bulletin S.B. 7-55-10. Alternative methods may be approved by the FAA Manager, New York ACO.
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Compliance Time
Within 60 days after the effective date of this AD
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Affected Aircraft
De Havilland DHC-7 series airplanes, including models DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, DHC-7-103, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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