AD Amdt-39-9122
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | de Havilland | DHC-8-100 and DHC-8- 300 | Airworthiness Directives; De Havilland Model DHC-8-100 and DHC-8- 300 Series Airplanes |
Unsafe Condition
The function of the proximity switch electronics unit (PSEU) may be adversely affected during operation of the white anti-collision lights.
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Required Actions
Revise the Airplane Flight Manual (AFM) to advise flight crew of cockpit indications for faulty anti-collision strobe light units and provide procedures for flight crew and maintenance actions. Install a modification to eliminate the need for the AFM revision.
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Affected Aircraft
De Havilland Model DHC-8-100 and DHC-8-300 series airplanes, including an added model under this amendment.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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