AD 2004-15-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | France Model EC155B and B1 | Airworthiness Directives; Eurocopter France Model EC155B and B1 Helicopters |
Unsafe Condition
Failure of the auxiliary system unit (ASU) board 10 Alpha 2, part number SE07451, may cause a short-circuit between two components, leading to the landing gear not extending in normal and emergency extension modes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Clean the ASU board within 15 hours time-in-service. Modify the wiring and wiring harness permanently within 10 months or temporarily within 30 days. If temporarily modified, install a placard and revise the Rotorcraft Flight Manual (RFM) with operating limitations for the emergency landing gear pump. Permanently modifying the wiring and wiring harness is the terminating action.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 15 hours time-in-service for cleaning, within 30 days for temporary wiring modification, and within 10 months for permanent wiring modification.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter France Model EC155B and B1 helicopters with auxiliary system unit (ASU) board 10 Alpha 2, part number SE07451, 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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