Airworthiness directives › 2021-07-16
AD 2021-07-16 Airworthiness Directives; Leonardo S.p.a. Helicopters
Models named: AB412. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Leonardo S.p.a. Model AB412 helicopters, certificated in any category, with a serial number up to 25669 inclusive, with a spiral bevel gear part number 204-040-701-103 with a serial number identified in Table 1 of Finmeccanica Helicopter Division Alert Bollettino Tecnico No. 412-146, Revision A, dated July 7, 2016 (Alert BT 412-146 Rev A).
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 10 hours time-in-service (TIS) after the effective date of this AD: (i) Visually inspect the spiral bevel gear teeth for a crack by following the Accomplishment Instructions, part I, paragraphs 9. and 10., of Alert BT 412-146 Rev A. (ii) If there is a crack, before further flight, remove the spiral bevel gear from service. (iii) If there is not a crack, within 100 hours TIS following paragraph (g)(1)(i) of this AD and thereafter at intervals not to exceed 300 hours TIS, fluorescent magnetic particle inspect the spiral bevel gear for a crack by following the Accomplishment Instructions, part II, paragraph 3., of Alert BT 412-146 Rev A. If there is a crack, before further flight, remove the spiral bevel gear from service. (2) As of the effective date of this AD, do not install a spiral bevel gear that is identified in paragraph (c) of this AD unless the actions required by paragraph (g)(1)(iii) have been previously accomplished within less than 300 hours TIS.
Unsafe condition
This AD was prompted by a cracked spiral bevel gear. The FAA is issuing this AD to prevent failure of the main rotor transmission. The unsafe condition, if not addressed, could result 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