AD 2001-18-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | Deutschland GmbH Model EC135 P1 and EC135 T1 | Airworthiness Directives; Eurocopter Deutschland GmbH Model EC135 P1 and EC135 T1 Helicopters |
Unsafe Condition
Failure of the RH main rotor drive torque strut between the main transmission and the fuselage, potentially leading to loss of control due to worn or ineffective back-up emergency stop.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Insert a copy of the AD or a statement into the RFM's Emergency Procedures section to instruct pilots to reduce power and land upon hearing a thump-like sound followed by unusual vibration. Visually inspect struts with 950 or more hours TIS for cracks or breaks within 10 hours TIS. Inspect struts with less than 950 TIS before accumulating 1000 hours TIS and struts with 950 or more TIS within 50 hours TIS using a 6-power or higher magnifying glass. Replace any cracked or broken strut with an airworthy one before further flight. Enter inspection details in the helicopter's historical record. Establish a life limit of 1000 hours TIS for struts in their original location, with an additional 1000 hours TIS if properly re-marked and relocated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter Deutschland GmbH Model EC135 P1 and EC135 T1 helicopters with main rotor drive torque strut assemblies, P/N L633M1001 103 and L633M1001 105.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.