AD 86-21-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | SOCATA | TB 10 | Airworthiness Directives; Socata Model TB10 and TB20 Series Airplanes |
| aircraft | SOCATA | TB 20 | Airworthiness Directives; Socata Model TB10 and TB20 Series Airplanes |
Unsafe Condition
Structural damage caused by battery electrolyte leaks under the battery tray, which could lead to loss of airframe integrity.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the fuselage area under the battery tray for damage from battery electrolyte leaks. If damage exists, repair or replace components and modify the battery tray per AC 43.13-1A and manufacturer's info. If no damage, modify the battery tray per SOCATA Service Letter No. 18 dated February 1985.
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Compliance Time
within 50 hours time-in-service or 60 days, whichever occurs first, from the effective date of this AD
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Affected Aircraft
Socata Models TB10 and TB20 with serial numbers 1 through 342, 344 through 381, 383 through 413, 415 through 422, 424, 430, 431, 433, and 439 through 441
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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