AD 99-10-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, -700, and -800 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, -700, and -800 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, -700, and -800 Series Airplanes |
| aircraft | The Boeing Company | 737-600 Series | Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, -700, and -800 Series Airplanes |
| aircraft | The Boeing Company | 737-700 Series | Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, -700, and -800 Series Airplanes |
| aircraft | The Boeing Company | 737-800 Series | Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, -700, and -800 Series Airplanes |
Unsafe Condition
Failure of the S245 trailing edge flap limit switch due to moisture penetration causing corrosion and electrical short circuit, resulting in uncommanded nose down stabilizer trim motion.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a special detailed inspection and functional test of the S245 trailing edge flap limit switch per Boeing Alert Service Bulletins 737-27A1227 or 737-27A1228. Replace malfunctioning limit switches with new ones. Modify the stabilizer control system as terminating action for inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 3 months of effective date for stabilizer control modification; inspections due based on flight hour thresholds specified in the AD.
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Affected Aircraft
Boeing Model 737-300, -400, -500, -600, -700, and -800 series airplanes equipped with Vickers combined stabilizer trim motors.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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