Airworthiness directives › 2021-19-17
AD 2021-19-17 Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
Models named: S-92A. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Sikorsky Aircraft Corporation Model S-92A helicopters, certificated in any category, with the following installed: (1) A Martin-Baker side facing utility seat supplier part number (P/N) MBCS12410AA001 with a serial number (S/N) identified in Table 2 of Martin-Baker Special Information Leaflet (SIL) No. 831, dated July 10, 2019 (SIL 831), that is not marked with “SIL831 incorporated;” or (2) A Martin-Baker observer seat supplier P/N MBCS12200 or MBCS7301-2 with an S/N identified in Table 2 of Martin-Baker SIL No. 833, dated July 11, 2019 (SIL 833), that is not marked with “SIL833 incorporated.” Note 1 to paragraph (c): SIL 831 and SIL 833 are attached to Sikorsky S-92A Helicopter Alert Service Bulletin ASB 92-25-026, Basic Issue, dated March 5, 2020 (ASB 92-25-026). Note 2 to paragraph (c): Section 3., the Accomplishment Instructions, Tables 1 and 2 of ASB 92-25-026, specify cross references of Martin-Baker supplier P/Ns with Sikorsky P/Ns and kit P/Ns. Note 3 to paragraph (c): The marking “SIL831 incorporated” or “SIL833 incorporated,” as applicable, could be located adjacent to identification labels on the underside of the sitting platform assembly P/N MBCS4111 or MBCS12215, respectively.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 125 hours time-in-service or six months after the effective date of this AD, whichever occurs first, replace each main back tube assembly by following Section 3., Accomplishment Instructions, paragraphs C. through E., of ASB 92-25-026; except where the service information referenced in ASB 92-25-026 specifies destroying and disposing of parts or discarding parts, this AD requires removing those parts from service instead. Note 4 to paragraph (g)(1): SIL 831 and SIL 833, referred to in ASB 92-25-026, refer to main back tube assembly as tube assembly, back main. (2) As of the effective date of this AD, do not install a Martin-Baker side facing utility seat identified in paragraph (c)(1) of this AD or a Martin-Baker observer seat identified in paragraph (c)(2) of this AD unless the actions in paragraph (g)(1) of this AD have been accomplished.
Unsafe condition
This AD was prompted by an incident of a side facing utility seat detaching from wall attachment points during dynamic testing. The FAA is issuing this AD to detect and address a main back tube, a component of the main back tube assembly, which does not meet design specifications. The unsafe condition, if not addressed, could result in increased surface friction in the direction of the seat attenuation, failure of proper utility seat attenuation during a crash event, excessive lumbar loads during a crash event, and subsequent excessive occupant injury.
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