Airworthiness directives › 2021-04-13
AD 2021-04-13 Airworthiness Directives; Airbus Helicopters
Models named: AS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350D, AS355E, AS355F, AS355F1, AS355F2. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all Airbus Helicopters, certificated in any category, as identified in paragraphs (c)(1) through (3) of this AD. (1) Model AS350B, AS350BA, AS350B1, AS350B2, AS350B3, and AS350D helicopters. (2) Model AS355E, AS355F, AS355F1, AS355F2, AS355N, and AS355NP helicopters. (3) Model EC130 B4 and EC130 T2 helicopters.
Compliance
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.
Required actions
(1) For the purposes of this AD, an affected part is any MRM having part number (P/N) 350A37-1290-XX (where XX can be any numerical combination) and a serial number as listed in Airbus Helicopters Alert Service Bulletin AS350-62.00.42, Revision 0, dated September 17, 2018; Airbus Helicopters Alert Service Bulletin AS355-62.00.37, Revision 0, dated September 17, 2018; or Airbus Helicopters Alert Service Bulletin EC130-62A017, Revision 0, dated September 17, 2018, as applicable to your model helicopter, unless the upper bearing inner race retaining rings are verified to be installed correctly as specified in the inspection required in paragraph (i)(1) of this AD. (2) For the purposes of this AD, a Group 1 helicopter is one on which an affected part is installed. (3) For the purposes of this AD, a Group 2 helicopter is one on which an affected part is not installed.
Unsafe condition
This AD was prompted by a report of a missing retaining ring of the inner race of the main rotor mast (MRM) upper bearing. The FAA is issuing this AD to address this condition, which, if not detected and corrected, can lead to damage to the MRM and surrounding elements, possibly resulting in loss of control of the helicopter.
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