AD 99-20-02
Unsafe Condition
Potential latent failure of the secondary lock actuator switch 1 of the thrust reverser system in the open position and potential failure of the secondary lock relay 1 in the energized position.
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Required Actions
Revise the Airplane Flight Manual (AFM) Limitations Section, perform repetitive operational tests and modifications to terminate repetitive checks, and install modifications per specified service bulletins.
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Compliance Time
Within 18 months after the effective date of this AD
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Affected Aircraft
Fokker Model F.28 Mark 0070 and 0100 series airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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