AD 94-04-06
Unsafe Condition
Mechanical ground/flight microswitches in the main landing gear downlock, temperature sensor, and anti-skid harness positions can freeze while in the flight position, causing loss of braking below 40 miles per hour when the anti-skid system is activated.
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Required Actions
Replace existing Dowty Electronics ground/flight microswitches (part number 620602801, issue 1) with improved issue 2 microswitches at specified positions. Install an anti-skid system ON/OFF switch in the flight compartment for affected serial numbers. Prohibit installation of issue 1 microswitches.
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Compliance Time
Within 3 months after the effective date of this AD for microswitch replacement; within 12 months after the effective date for anti-skid switch installation.
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Affected Aircraft
Fokker Model F28 Mark 0100 series airplanes with serial numbers 11244 through 11265 inclusive, 11268 through 11283 inclusive, 11286, 11289, 11291, 11293, 11295, 11297, 11300, and 11303.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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