AD 2020-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model AS350B2 | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
loss of electrical power to the NR indicator when the emergency cut-out control is activated, which could result in increased pilot workload and reduced helicopter control.
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Required Actions
Before further flight, perform a ground run-up with the fuel flow control lever in the flight gate with the collective control in the down/locked position. While at flight NR speed, activate the emergency cut-out control and observe the NR indicator display value. If the NR indicator display changes or drops to zero, before further flight, alter the NR indicator wiring as depicted in Figures 1 and 2 of Airbus Helicopters Alert Service Bulletin No. AS350-63.00.27, Revision 0, dated May 17, 2016, and conduct a continuity test to confirm correct alteration of the wiring.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus Helicopters Model AS350B2 helicopters, certificated in any category, with a main rotor RPM (NR) sensor part number 704A37614007 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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