Airworthiness directives › 2014-26-02
AD 2014-26-02 Airworthiness Directives; Airbus Helicopters (Previously Eurocopter France)
Applicability*9
This AD becomes effective January 30, 2015.
Compliance
(1) The Manager, Safety Management Group, FAA, may approve AMOCs for this AD. Send your proposal to: George Schwab, Aviation Safety Engineer, Safety Management Group, Rotorcraft Directorate, FAA, 2601 Meacham Blvd., Fort Worth, Texas 76137; telephone (817) 222-5110; email george.schwab@faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office, before operating any aircraft complying with this AD through an AMOC.
Required actions
For service information identified in this AD, contact Airbus Helicopters, Inc., 2701 N. Forum Drive, Grand Prairie, TX 75052; telephone (972) 641-0000 or (800) 232-0323; fax (972) 641-3775; or at http://www.airbushelicopters.com/techpub. You may review a copy of the service information at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137.
Unsafe condition
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.”
Affected ADs
This AD defines the unsafe condition as an autopilot software design that incorrectly calculates the estimated ground speed at zero. This condition results in unpredictable roll oscillations during a coupled Very High Frequency Omnidirectional Range (VOR) or Localizer/Instrument Landing System (LOC/ILS) approach, which could result in loss of helicopter control.
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