AD 90-24-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 737-200, 737-300 and 737-400 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 737-200, 737-300 and 737-400 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING Model 737-200, 737-300 and 737-400 Series Airplanes |
Unsafe Condition
Fastener fracture in the fitting attachment which could result in a loss of the outboard flap.
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Required Actions
Perform a visual inspection of the outboard flap support fitting attach bolts in accordance with specified service bulletins. If bolts are BACB30LE6 or BACB30US6, no further action is required. If BACB30MT bolts are found, perform torque inspections every 1,000 flight hours and replace bolts if they turn below specified torque. Replace any other bolts with BACB30LE or BACB30US prior to further flight.
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Compliance Time
Prior to the accumulation of 5,000 flight hours or within 12 months after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Boeing Model 737-200, 737-300, and 737-400 series airplanes listed in Boeing Alert Service Bulletins 737-57A1206 (dated April 12, 1990) and 737-57A1208 (dated March 29, 1990).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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