AD 89-14-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Embraer - Empresa Brasileira de Aeronautica S.A. | EMB-120 | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA, S.A. (EMBRAER) Model EMB-120 and EMB-120RT Series Airplanes |
| aircraft | Embraer - Empresa Brasileira de Aeronautica S.A. | EMB-120RT | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA, S.A. (EMBRAER) Model EMB-120 and EMB-120RT Series Airplanes |
Unsafe Condition
Water contamination in the APU electrical control unit (ECU) could cause an uncontrolled APU overspeed.
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Required Actions
Inspect the APU ECU for water contamination by removing and examining it in a workshop, installing covers on connectors, and ensuring no foreign objects enter. Replace the ECU if moisture or water is found. Install a cover over the vent screen during pressurized cleaning. Alternate compliance may be approved by the FAA Manager.
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Compliance Time
within 25 hours time in service, or prior to the next APU start, whichever occurs later, after the effective date of this AD
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Affected Aircraft
EMBRAER Model EMB-120 and EMB-120RT series airplanes equipped with Garrett APU models GTCP36-150(A) or GTCP36-150(AA)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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