AD 91-15-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | SOCATA | TB 10 | Airworthiness Directives; SOCATA Groupe AEROSPATIALE Models TB9 and TB10 airplanes and Models TB20 and TB21 airplanes |
| aircraft | SOCATA | TB 20 | Airworthiness Directives; SOCATA Groupe AEROSPATIALE Models TB9 and TB10 airplanes and Models TB20 and TB21 airplanes |
| aircraft | SOCATA | TB 21 | Airworthiness Directives; SOCATA Groupe AEROSPATIALE Models TB9 and TB10 airplanes and Models TB20 and TB21 airplanes |
| aircraft | SOCATA | TB9 | Airworthiness Directives; SOCATA Groupe AEROSPATIALE Models TB9 and TB10 airplanes and Models TB20 and TB21 airplanes |
Unsafe Condition
Loose or improperly installed horizontal stabilizer balance weight attachment nuts could cause adverse airplane handling qualities and possible loss of control of the airplane.
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Required Actions
Inspect the horizontal stabilizer balance weight attachment nuts for proper installation per SOCATA Service Bulletin No. 57. If loose or improperly installed, remove, inspect, modify, and reinstall the horizontal stabilizer balance weight prior to further flight. If properly installed, complete requirements in Part 3 of the service bulletin.
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Compliance Time
within the next 25 hours time-in-service after the effective date of this AD
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Affected Aircraft
SOCATA Models TB9 (serial numbers 1 through 1217), TB10 (serial numbers 1 through 1217), TB20 (serial numbers 1 through 1030), and TB21 (serial numbers 1 through 1030)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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