AD 91-23-11
Unsafe Condition
Failure to achieve climb performance and reduction of obstacle clearance margins due to use of FLEX takeoff and multifunction display units (MFDU) Part Number 622-8047-401.
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Required Actions
Delete FLEX takeoff references in AFM Sections 2.02.02 and 2.06.01 within 10 days. Replace MFDU P/N 622-8047-401 with P/N 622-8047-411 within one year per Fokker SB F100-31-017 and Collins SB DU-1000A-34-10. After replacement, restore AFM sections and remove prior limitations.
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Compliance Time
Within 10 days after the effective date of this AD and within one year after the effective date of this AD
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Affected Aircraft
FOKKER Model F-28 Mark 0100 series airplanes; Serial Numbers 11244 through 11306, 11308, 11310, and 11312 through 11314; 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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