Airworthiness directives › 2020-22-13
AD 2020-22-13 Airworthiness Directives; Airbus Helicopters
Models named: AS332C1, AS332L1. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Airbus Helicopters Model AS332C1 and AS332L1 helicopters, certificated in any category, all manufacturer serial numbers, equipped with an Advanced Helicopter Cockpit & Avionics System (AHCAS), except helicopters that have Airbus Helicopters modification 0728576 embodied in production.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 30 days after the effective date of this AD: Amend the emergency procedures of the existing rotorcraft flight manual (RFM) for your helicopter by inserting the supplemental text specified in figure 1 to paragraph (g)(1) of this AD, immediately following paragraph 9 GROUND/FLIGHT LOGIC FAULT. ER03NO20.035 (2) Within 100 hours time-in-service or before intentional flight into IMC, whichever occurs first after the effective date of this AD, do the wiring modification of the “flight/ground” logic signal source of the AHRS 1 in accordance with the Accomplishment Instructions of Airbus Helicopters Alert Service Bulletin No. AS332-34.00.60, Revision 1, dated March 29, 2019. After completion of the wiring modification, the RFM amendment required by paragraph (g)(1) of this AD must be removed from the existing RFM for your helicopter.
Unsafe condition
This AD was prompted by a report that the affected helicopters use the same “flight/ground” logic signal, instead of independent redundant signals. The FAA is issuing this AD to address certain helicopters that use the same “flight/ground” logic signal, instead of independent redundant signals. If both attitude and heading reference systems (AHRS) incorrectly receive “ground” status in flight, as a result for instance of a single failure, this will generate consistent erroneous computation of the attitudes and vertical speed during helicopter maneuvers with consequent incorrect flight data indications to the flight crew on both primary displays. Erroneous flight information could lead to increased workload for the flight crew when the upper modes of the automatic flight control system are not engaged, possibly resulting in reduced control of the helicopter during high speed maneuvers in instrumental meteorological conditions (IMC).
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1