AD 86-25-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-101 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-102 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-103 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-106 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-201 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-202 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-301 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-311 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-8-315 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | Viking Air Limited | DHC-7-1 | Airworthiness Directives; DeHavilland Model DHC-7 and DHC-8 Series Airplanes |
Unsafe Condition
Accumulated water freezing in the elevator trim-tab jack-screw housing could cause the elevator trim-tab to become inoperable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Incorporate de Havilland Modification Numbers 7/2489 (for DHC-7) or 8/0415 (for DHC-8) to provide a drain hole in the elevator trim-tab jack-screw housing, following the instructions in the respective service bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within three months after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
De Havilland Model DHC-7 and DHC-8 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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.