AD 2004-22-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | Deutschland GmbH Model EC135 P1, P2, T1, and T2 | Airworthiness Directives; Eurocopter Deutschland GmbH Model EC135 P1, P2, T1, and T2 Helicopters |
Unsafe Condition
Failure of the main rotor drive aluminum torque strut assembly (strut), part number L633M1001 103 or L633M1001 105, which could lead to loss of control of the helicopter.
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Required Actions
Insert a statement in the Rotorcraft Flight Manual to inform pilots to reduce power and land upon experiencing a thump-like sound followed by unusual vibration. Visually inspect each aluminum strut daily for cracks or breaks and replace any unairworthy strut with a titanium strut (P/N L633M1001 104). Replace all aluminum struts with titanium struts within 100 hours time-in-service if they have 400 or more hours TIS. Reduce the retirement life of aluminum struts to 500 total hours TIS or retire them by December 31, 2004, whichever comes first. Replace aluminum struts in pairs and recalculate weight and balance after installing titanium struts.
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Compliance Time
Before further flight for some actions, within 100 hours time-in-service for strut replacement, and by December 31, 2004, for life limit compliance.
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Affected Aircraft
Eurocopter Deutschland GmbH Model EC135 P1, P2, T1, and T2 helicopters with main rotor drive aluminum torque strut assembly (strut), part number L633M1001 103 or L633M1001 105, installed.
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
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