AD 89-23-09
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 Series Airplanes |
| aircraft | Embraer - Empresa Brasileira de Aeronautica S.A. | EMB-120RT | Airworthiness Directives; EMPRESA BRASILEIRA DE AERONAUTICA, S.A. (EMBRAER) Model EMB-120 Series Airplanes |
Unsafe Condition
Malfunction of the landing gear aural warning system could cause a gear-up landing.
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Required Actions
Modify the landing gear aural warning system and calibrate new switches in accordance with EMBRAER Service Bulletin No. 120-032-0055 or 120-032-0052. An alternate means of compliance or adjustment of compliance time may be approved by the Manager, Atlanta Aircraft Certification Office. Special flight permits may be issued under FAR 21.197 and 21.199.
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Compliance Time
within 180 days after the effective date of this AD, unless previously accomplished
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Affected Aircraft
EMBRAER Model EMB-120 series airplanes with serial numbers 120004, 120006 through 120070, 120072 through 120080, and 120082 through 120099, 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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