AD 98-17-07
Unsafe Condition
Malfunction of the wing leading edge thermal anti-ice system due to missing bleed air exhaust holes or heat damage, which could result in reduced controllability of the airplane and/or reduced structural integrity of the wing due to overheating.
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Required Actions
Inspect all wing leading edge sections for correct number of bleed air exhaust holes within 60 days after the effective date. If missing holes are detected, rework sections to add correct holes and inspect auxiliary/front spar for heat damage. If heat damage is found, repair structure per approved method.
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Compliance Time
Within 60 days after the effective date of this AD. If missing holes or heat damage are detected, corrective actions must be accomplished prior to further flight.
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Affected Aircraft
Fokker Model F28 Mark 0070 and Mark 0100 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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