AD 97-02-21
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-120ER | 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
Cracking of wing rib-to-skin support brackets (shear clips) can lead to loosening of rivets in the wing skin, fuel leakage through rivet holes, and reduction of wing structural integrity.
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Required Actions
Inspect wing skin along rib lines 15 and 16 for fuel leakage other than stains every 50 flight hours. Perform internal visual inspections for bracket cracking if leakage is found, and replace cracked brackets with new or serviceable brackets. Eventually replace specific brackets with new 'new style' brackets to terminate inspections.
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Compliance Time
Within 10 days after the effective date of this AD, then repeat every 50 flight hours until requirements of paragraph (d) are accomplished.
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Affected Aircraft
EMBRAER Model EMB-120 airplanes, serial numbers 120001, 120003, 120004, and 120006 through 120304 inclusive; 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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