AD 98-24-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | AS332C | Airworthiness Directives; Eurocopter France Model AS 332C, AS 332L, AS 332L1, and AS 332L2 Helicopters |
| aircraft | Airbus Helicopters | AS332L | Airworthiness Directives; Eurocopter France Model AS 332C, AS 332L, AS 332L1, and AS 332L2 Helicopters |
| aircraft | Airbus Helicopters | AS332L1 | Airworthiness Directives; Eurocopter France Model AS 332C, AS 332L, AS 332L1, and AS 332L2 Helicopters |
| aircraft | Airbus Helicopters | AS332L2 | Airworthiness Directives; Eurocopter France Model AS 332C, AS 332L, AS 332L1, and AS 332L2 Helicopters |
Unsafe Condition
Failure of the rotor drive engine-to-main gearbox (MGB) coupling could cause loss of load on the engine, resulting in engine overspeed, leading to an uncontained engine turbine wheel burst and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Insert emergency procedures into the Rotorcraft Flight Manual (RFM) for actions if 'OVSP 1' or 'OVSP 2' amber warning lights illuminate; measure engine-to-MGB shaft vibration levels; inspect torque on MGB coupling bolts; perform engine-to-MGB coupling RPM input checks; inspect spline and splined flanges; and inspect vibration levels after coupling reassembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to further flight
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Affected Aircraft
Eurocopter France Model AS 332C, AS 332L, AS 332L1, and AS 332L2 helicopters, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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