Airworthiness Directive · Amendment 39-18053 · Autopilot system
Airbus Helicopters (Previously Eurocopter France)
This AD applies to Model EC155B1 and AS 365 N3 helicopters with an automated flight control system APM2000 Auto Pilot Module, part number 416-00297-163, with a Garmin GNS- or GTN-series global positioning system (GPS) installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for 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. This AD requires revising the Rotorcraft Flight Manual (RFM) to prohibit using the autopilot coupled with a Localizer/Instrument Landing System (LOC/ ILS) or Very High Frequency Omnidirectional Range (VOR) approach. This AD is prompted by a report of unpredictable and unexpected roll oscillations during coupled LOC or VOR approaches.This condition, if not corrected, could result in loss of helicopter control.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
Before further flight, insert a copy of this AD in the Rotorcraft Flight Manual or make the following pen-and-ink changes:
(1) In the Eurocopter EC 155B1 Flight Manual, under Limitations (Prohibited Maneuvers) add: “Coupled LOC/VOR approaches.”
(2) In the Airbus Helicopters Flight Manual EC155B1:
(i) Under Limitations, add: “Autopilot coupled with a LOC/ILS or VOR approach is prohibited.”
(ii) Under Normal Procedures, remove paragraphs 4.2 (Power-on GPS on Ground or In Flight) and 4.3 (Pre-taxiing checklist) in their entirety. Performing the procedures in Paragraphs 4.2 and 4.3 is prohibited.
(3) In the Eurocopter Flight Manual AS 365 N3, under Limitations, add: “Autopilot coupled with a LOC/ILS or VOR approach is prohibited.”
