Airworthiness directives › 2020-08-02
AD 2020-08-02 Airworthiness Directives; Thales AVS France SAS Global Positioning System/Satellite Based Augmentation System Receivers
Applicability*9
This AD applies to Thales AVS France SAS (Thales) Global Positioning System/Satellite Based Augmentation System (GPS/SBAS) receivers, Topstar 200 LPV, part numbers (P/Ns) C17149JA02 and C17149HA01. These GPS/SBAS receivers are installed on, but not limited to, ATR-GIE Avions de Transport Régional (ATR) model ATR42 and ATR72 airplanes and Sikorsky Aircraft Corporation model S-76D helicopters, respectively.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For operators of affected ATR model ATR42 and ATR72 airplanes: (i) Update the aircraft's navigation database within 30 days after the effective date of this AD using the software upload instructions, as applicable, in the following: (A) ATR72 Aircraft Maintenance Manual (AMM) Job Instruction Cards, Doc. No. 45-11-00 LDG 10030-004, dated June 1, 2018. (B) ATR42-400/500 Series AMM Job Instruction Cards, Doc. No. 45-11-00 LDG 10030-004, dated July 1, 2018. (C) Thales Service Information Letter (SIL) Doc. No. THAV/SIL-1308, Issue 7, dated September 28, 2018. (ii) [Reserved] (2) For operators of affected ATR model ATR42 and ATR72 airplanes: (i) Within 30 days after the effective date of this AD, amend Section 1.2 “Each Flight Checks” of the pre-flight section in the applicable airplane flight manual by inserting the change shown in Figure 1 and Figure 2 to paragraph (g)(2)(i) of this AD. ER14AP20.000 ER14AP20.001 (ii) Before each flight, power cycle the Thales GPS/SBAS receiver unit. (3) For operators of Sikorsky S-76D helicopters, within 30 days after the effective date of this AD, update the aircraft's navigation database using the instructions in TASK 31-61-00-800-802, “2. FMS Database Update for Multifunction Display (MFD)” of the Sikorsky Aircraft Corporation, AMM SA S76D-AMM-000, 31-61-00, dated November 30, 2017.
Unsafe condition
This AD was prompted by reports that Thales GPS/SBAS receivers provided, under certain conditions, erroneous outputs on aircraft positions. The FAA is issuing this AD to prevent erroneous aircraft position outputs from the Thales GPS/SBAS receivers. The unsafe condition, if not addressed, could result in controlled flight into terrain and loss of the aircraft.
Affected ADs
None.
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