AD 89-23-03
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
Erratic glide slope information during IFR approaches due to the Chelton glide slope antenna, P/N 17-21F6P3.
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Required Actions
Replace the Chelton glide slope antenna with a Collins glide slope antenna type 37P5, P/N 522-0700-023, install pedestal-type support P/N 120-47294-001, and comply with EMBRAER Service Bulletin 120-034-0072.
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Compliance Time
within 100 days after the effective date of this AD
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Affected Aircraft
Model EMB-120 series airplanes listed in EMBRAER Service Bulletin 120-034-0072, dated April 14, 1989, 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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