AD Amdt-39-10223
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Fokker | F28 Mark 0070 and 0100 | Airworthiness Directives; Fokker Model F28 Mark 0070 and 0100 Series Airplanes |
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 within 30 days after the effective date. Repair or replace failed pitot tube heating elements before further flight. Replace the No. 1 pitot tube with a type 853BR pitot tube and install an improved inverter, current sensor, wiring, and circuit breaker as specified in Fokker Service Bulletin SBF100-30-019. Install new power supply wiring with increased gauge thickness and a circuit breaker with an increased amperage rating.
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Compliance Time
Within 30 days after the effective date (January 2, 1998) for the operational test. Replacement of pitot tube and system modifications must be done by the compliance time specified in paragraphs (b)(1) or (b)(2), which are not explicitly stated but inferred as within 18 months based on the NPRM and comments.
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Affected Aircraft
Fokker Model F28 Mark 0070 and 0100 series airplanes with specified serial numbers: 11244 through 11495, 11497 through 11507, 11509, 11511 through 11517, 11519 through 11523, 11527 through 11529, 11532, 11536 through 11541, 11543, 11545, 11547, 11549, 11551, 11553 through 11565, 11567, 11570, 11573, and 11574.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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