AD 88-25-07
Unsafe Condition
Failure of the emergency lighting system to illuminate during an emergency due to absence of a three position emergency lighting switch or inadequate power source when normal electrical power is lost.
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Required Actions
Verify installation of a three position emergency lighting switch in the cockpit and its proper operation upon loss of normal electrical power. Modify the emergency lighting system to use dedicated battery packs or adjust the control circuit to switch to emergency battery packs before minimum voltage is reached.
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Compliance Time
within 12 months after the effective date of this AD
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Affected Aircraft
FOKKER B.V. Model F-28 Mark 1000, 2000, 3000, and 4000 series airplanes, certificated in any category
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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