AD 2014-26-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Various | Airworthiness Directives; Airbus Helicopters (Previously Eurocopter France) |
Unsafe Condition
Intermittent, unpredictable roll oscillations during coupled LOC/ILS or VOR approaches due to the Garmin GPS equipment declaring the helicopter's position as invalid on the data output bus, even though the GPS correctly displays the position. This causes the APM2000 AFCS to calculate an estimated ground speed at zero, leading to adverse vectoring calculations and roll oscillations.
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Required Actions
Before further flight, revise the Rotorcraft Flight Manual (RFM) to prohibit using the autopilot coupled with a LOC/ILS or VOR approach. For Model EC155B1 helicopters, also revise the RFM to prohibit certain procedures for resetting the autopilot before taxiing.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus Helicopters (previously Eurocopter France) Model EC155B1 and AS 365 N3 helicopters with a certain automated flight control system (AFCS) and with a Garmin global positioning system (GPS) installed.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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