AD 2001-09-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 737-600 | Airworthiness Directives; Boeing Model 737-600, -700, -700C, and -800 Series Airplanes |
Unsafe Condition
Improperly torqued jam nuts on the elevator tab control rods could result in damage to the tab control rod. If both tab control rods are damaged, excessive freeplay in the tab control mechanism can occur, which could result in elevator tab flutter and consequent loss of controllability of the airplane.
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Required Actions
Inspect the small jam nut on the elevator tab control rods to detect inspection putty and determine its condition. Perform a torque check of the small and large jam nuts on the tab control rod, if necessary. Take corrective actions, including detailed visual inspection of the rod end bearing threads for wear, measuring the diameter of the threads, replacing the rod end bearing and threaded adjustment bushing, torquing the jam nuts, and applying inspection putty, as applicable. Report both positive and negative results of inspections to Boeing.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 737-600, -700, -700C, and -800 series airplanes, line numbers 1 through 788 inclusive, 790 through 814 inclusive, 816, 819, 821, and 823, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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