AD 99-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes, |
| aircraft | The Boeing Company | 737-200 Series | Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes, |
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes, |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes, |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes, |
Unsafe Condition
Incorrect installation of the fastener connecting the input rod of the spoiler mixer mechanism to the torque tube crank, including use of incorrect hardware, lack of secondary retention, and inverted bolt installation. Previously specified torque values for the nut and bolt could cause failure, leading to disconnection of the linkage between the ratio changer input rod and the aft aileron control quadrant.
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Required Actions
Perform a one-time inspection to verify correct installation of the fastener. Correct discrepancies by reinstalling or replacing the fastener with a new or serviceable nut, bolt, and cotter pin. Report inspection results to the FAA.
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Compliance Time
Within 90 days of the effective date (December 15, 1999)
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Affected Aircraft
All Boeing Model 737-100, -200, -300, -400, and -500 series airplanes, regardless of modifications.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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