AD 2009-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1 Helicopters |
Unsafe Condition
Detachment and migration of lead balance weights toward the tip of the main rotor blade, causing severe vibrations and potential blade failure, leading to loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the main rotor blade upper and lower surfaces for bulging. Replace blades with lead balance weights if bulging exceeds specified criteria. Revise the maintenance manual to incorporate inspection intervals.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 5 flight hours time-in-service (TIS) after the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1 helicopters, specifically those equipped with main rotor blades fitted with lead balance weights.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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