AD 90-02-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-201 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-202 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-301 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-315 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 Series Airplanes |
Unsafe Condition
Failure of the main landing gear (MLG) to extend due to potential issues with the main landing gear uplock actuator, specifically those with Part Numbers 10800-103, -105, -107, -109, -111 and without Modification 8/1098 incorporated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 50 hours time-in-service after the effective date, inspect the MLG uplock installation per Service Bulletin 8-32-79, Rev A. If sensor bracket is under flush and no spacers, rework the actuator before further flight. Within one year, rework and reidentify all uplock actuators per DOWTY Alert SB paragraph 2.E. Terminate inspections after rework. Allow alternate compliance with FAA approval.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service after the effective date of this AD, and within one year after the effective date for rework of uplock actuators.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Of Canada, Ltd., De Havilland Division Model DHC-8 series airplanes, serial numbers 3 through 144 inclusive, equipped with main landing gear uplock actuator Part Numbers 10800-103, -105, -107, -109, -111, and without Modification 8/1098.
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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