Airworthiness directives › 2012-22-14
AD 2012-22-14 Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters
Applicability*9
This AD supersedes Emergency AD No. 2011-22-51, Directorate ID 2011-SW-056-AD, dated October 13, 2011.
Compliance
Before further flight: (1) Borescope inspect the IGB for any obstruction in the oil passages. Borescope inspect in accordance with the following portions of Sikorsky Alert Service Bulletin No. 70-06-29A, dated October 11, 2011 (ASB), except this AD does not require returning any parts to “depot” or Sikorsky: (i) The Accomplishment Instructions, Section 3., paragraphs A.(1) through A.(3)(a); (ii) Equipment and Materials and Inspection sections of Appendix I; and (iii) Figures 1 through 10 of Appendix I. (2) As an alternative to the requirements of paragraph (f)(1) of this AD, disassemble the IGB and inspect the oil passages for any obstruction. Removing any obstruction from the IGB does not make it airworthy. (3) If there is any obstruction in any oil passage, replace the IGB with an airworthy IGB before further flight.
Required actions
Special flight permits are prohibited.
Unsafe condition
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
Affected ADs
This AD defines the unsafe condition as blockage of the internal oil passages of the IGB by a protective plug, that could result in overheating and seizing of the IGB, failure of the tail rotor drive output shaft, loss of tail rotor drive, and subsequent loss of control of the helicopter.
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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