AD 87-12-09 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | SOCATA | TB 20 | Airworthiness Directives; Socata Model TB 20 and TB 21 Series Airplanes |
| aircraft | SOCATA | TB 21 | Airworthiness Directives; Socata Model TB 20 and TB 21 Series Airplanes |
Unsafe Condition
Loose aileron balance weight attachment rivets and cracks in the aileron skin could lead to structural failure of the aileron, possible flutter, and loss of control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the five aileron balance weight attachment rivets for looseness and aileron skin for cracks using SOCATA TB Service Bulletin No. 28. If loose rivets or short cracks are found, repair as specified; if longer cracks are found, replace the aileron with specified part numbers. Repetitive inspections are no longer required after repair or replacement.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours time-in-service (TIS) after the effective date of this AD, and each 100 hours TIS thereafter
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Socata Models TB 20 and TB 21 (Serial Numbers 275 through 700) airplanes certificated in any category.
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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