AD 97-24-16
Unsafe Condition
Icing of the No. 1 pitot tube could result in failure of the No. 1 Air Data Computer or output of erroneous airspeed data to all on-side subsidiary systems, including the Automatic Flight Control and Augmentation System.
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Required Actions
Perform a one-time operational test of the No. 1 pitot heating system using Fokker Service Bulletin SBF100-30-015. Repair or replace failed pitot heating elements. Replace the No. 1 pitot tube with type 853BR and install new power supply wiring and circuit breaker per Fokker Service Bulletin SBF100-30-019.
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Compliance Time
Within 30 days after the effective date of this AD for the operational test. Replacement of the pitot tube must be accomplished within 9 months or 18 months after the effective date, depending on FWS speed comparator status and pitot tube type.
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Affected Aircraft
Fokker Model F28 Mark 0070 and 0100 series airplanes with specified serial numbers: 11244 through 11495, inclusive; 11497 through 11507, inclusive; 11509; 11511 through 11517, inclusive; 11519 through 11523, inclusive; 11527 through 11529, inclusive; 11532; 11536 through 11541, inclusive; 11543; 11545; 11547; 11549; 11551; 11553 through 11565, inclusive; 11567; 11570; 11573; and 11574.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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