Airworthiness directives › 2020-15-17
AD 2020-15-17 Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
Models named: S-76C. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Sikorsky Aircraft Corporation Model S-76C helicopters, certificated in any category, equipped with remote data acquisition unit (RDAU) part number 76450-01098-106, 76450-01098-107, or 76450-01098-109.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 500 hours time-in-service after the effective date of this AD, do the actions specified in paragraphs (g)(1) through (4) of this AD, as applicable to your helicopter. (1) For helicopters equipped with RDAU part number 76450-01098-109, update the RDAU software and re-identify the RDAU in accordance with Section 3., Paragraphs A. through J. of the Accomplishment Instructions of Sikorsky Alert Service Bulletin 76-31-3, Revision B, dated June 26, 2018, except you are not required to return the RDAU to Parker Fluid Systems Division (FSD). (2) For helicopters equipped with RDAU part number 76450-01098-107, update the RDAU software and re-identify the RDAU in accordance with Section 3., Paragraphs A. through J. of the Accomplishment Instructions of Sikorsky Alert Service Bulletin 76-31-4, Revision A, dated May 30, 2018, except you are not required to return the RDAU to Parker FSD. (3) For helicopters equipped with RDAU part number 76450-01098-106, update the RDAU software and re-identify the RDAU in accordance with Section 3., Paragraphs A. through K. of the Accomplishment Instructions of Sikorsky Alert Service Bulletin 76-31-5, dated July 31, 2018, except you are not required to return the RDAU to Parker FSD. (4) For helicopters equipped with RDAU part number 76450-01098-106, update the software of DU part number 76450-01098-101 and re-identify the DU as part number 76450-01098-108, in accordance with Section 3., Paragraphs A. through J. of the Accomplishment Instructions of Sikorsky Service Bulletin 76-006, Revision A, dated August 23, 2018, except you are not required to return the DU to Parker FSD.
Unsafe condition
This AD was prompted by reports of inaccurate main gear box (MGB) indications in flight. The FAA is issuing this AD to address inaccurate MGB indications in flight, resulting in multiple erroneous values/annunciations on channel B, which could cause the flight crew to land immediately, and consequent possible loss of the helicopter, injury, or fatality.
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