AD 99-09-18
Unsafe Condition
Leakage of hot air from the corrujoint seals of the low- and high-pressure check valves located in the stubwings, and subsequent heat damage of fuselage skin and stubwing structure adjacent to bleed air system components in the stubwings, which could result in reduced structural integrity of the airplane.
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Required Actions
Perform a one-time visual inspection of the fuselage skin in the left- and right-hand stubwings to detect heat damage; either repetitive leak tests of the seals of the bleed air system or repair of any heat-damaged structure as necessary; replace corrujoint seals with new improved seals; and repetitive inspections of the fuselage skin and stubwing connection angles to detect heat damage, with an optional terminating action via Fokker Proforma Service Bulletin F100-36-027.
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Compliance Time
Within 3,000 flight hours or 12 months after May 14, 1998, whichever occurs first.
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Affected Aircraft
Fokker Model F.28 Mark 0070 and Mark 0100 series airplanes equipped with corrujoint seal part number BE20061 or where Service Bulletin SBF100-36-027 has not been accomplished.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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