AD 90-25-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | SOCATA | TB 10 | Airworthiness Directives; SOCATA GROUPE AEROSPATIALE Models TB9, TB10, TB20, and TB21 airplanes |
| aircraft | SOCATA | TB 20 | Airworthiness Directives; SOCATA GROUPE AEROSPATIALE Models TB9, TB10, TB20, and TB21 airplanes |
| aircraft | SOCATA | TB 21 | Airworthiness Directives; SOCATA GROUPE AEROSPATIALE Models TB9, TB10, TB20, and TB21 airplanes |
| aircraft | SOCATA | TB9 | Airworthiness Directives; SOCATA GROUPE AEROSPATIALE Models TB9, TB10, TB20, and TB21 airplanes |
Unsafe Condition
Loss of oil due to cracks or distortions in the mounting bases of the oil cooler inlet and outlet elbows and sponsons near the outlet fittings, which could cause uncontrolled release of flammable fluids into the engine compartment and engine malfunction.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the mounting bases of the oil cooler inlet and outlet elbows and sponsons near the outlet fittings for cracks or distortions. If found, remove the damaged cooler and install a new engine oil cooler as specified in SOCATA Mandatory Service Bulletin No. 50/1. Allow ferry flights under FAR 21.197/21.199 to reach the repair location.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 25 hours time-in-service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
SOCATA GROUPE AEROSPATIALE Models TB9, TB10, TB20, and TB21 airplanes (all serial numbers)
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.