AD 2017-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Fokker | Services B | Airworthiness Directives; Fokker Services B.V. Airplanes |
Unsafe Condition
Exit signs installed on certain Fokker Services B.V. Model F28 Mark 1000, 2000, 3000, and 4000 airplanes, which are self-illuminated by a hydrogen isotope known as Tritium, may lose their brightness as the isotope decays over time.
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Required Actions
Replace all Tritium exit signs with photo-luminescent signs. Inspect the new photo-luminescent signs. Revise the airplane maintenance program to include repetitive maintenance tasks for the new photo-luminescent signs.
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Compliance Time
Within 7 years from the date of manufacture or installation of the Tritium exit signs.
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Affected Aircraft
Fokker Services B.V. Model F28 Mark 1000, 2000, 3000, and 4000 airplanes, specifically serial numbers 11029, 11030, 11042 in pre-SBF28/33-13 Appendix V configuration, and a range of other serial numbers as listed in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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