Airworthiness directives › 2022-03-09
AD 2022-03-09 Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
Models named: S-76D. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Sikorsky Aircraft Corporation Model S-76D helicopters, certificated in any category, with Thales Global Positioning System (GPS) TopStar 200 LPV receiver part number (P/N) C17149HA01 installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 130 hours time-in-service after the effective date of this AD, replace each affected GPS receiver identified in paragraph (c) of this AD with GPS receiver P/N C17149RA01 in accordance with the Accomplishment Instructions, paragraphs A., C., and D., of Sikorsky S-76D Helicopter Service Bulletin SB 76-017, Basic Issue, dated May 11, 2021. (2) As of the effective date of this AD, do not install a GPS receiver identified in paragraph (c) of this AD on any helicopter. (3) Accomplishing paragraph (g)(1) of this AD terminates the requirements of AD 2020-08-02.
Unsafe condition
This AD was prompted by reports that certain Thales GPS satellite based augmentation system (SBAS) receivers provided, under certain conditions, erroneous outputs on aircraft positions. The unsafe condition, if not addressed, could result in controlled flight into terrain and loss of control of the helicopter.
Affected ADs
This AD affects AD 2020-08-02, Amendment 39-21108 (85 FR 20586, April 14, 2020) (AD 2020-08-02).
Read the original on the Federal Register →
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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