AD 2004-05-29
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | EC 155B | Airworthiness Directives; Eurocopter France Model EC 155B Helicopters |
Unsafe Condition
Tail rotor induced vibrations during flight tests could lead to blade pitch control failure and subsequent loss of control of the helicopter.
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Required Actions
Install a tail rotor blade-to-torsion bar attachment tuning weight assembly (P/N 365A33-3546-00) on each blade of the Quiet Fenestron tail rotor. Replace each blade attachment bushing (P/N 365A33-3530-20) and prohibit mixing old and new components.
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Compliance Time
Before further flight
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Affected Aircraft
Eurocopter France Model EC 155B helicopters with Quiet Fenestron tail rotor systems requiring compliance with Service Bulletins 64-002 and/or 65-003.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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