Airworthiness directives › 2021-16-13
AD 2021-16-13 Airworthiness Directives; Leonardo S.p.a. Helicopters
Models named: A109S. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Leonardo S.p.a. Model A109S helicopters and AW109SP helicopters, certificated in any category, with vertical fin vibration absorber installation part number (P/N) 109-B810-79-101 installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 30 hours time-in-service (TIS) after the effective date of this AD, and thereafter at intervals not to exceed 100 hours TIS: (i) Remove the vertical fin vibration absorber installation P/N 109-B810-79-101, and using a mirror and light source, visually inspect the rib assembly P/N 109-0372-53-201 for hole elongation, fretting, and cracks. If there is any hole elongation, fretting, or cracks, before further flight, remove rib assembly P/N 109-0372-53-201, shim P/N 109-0372-53-211, doubler P/N 109-0372-53-213, and bracket P/N 109-0373-02-113 from service and replace with airworthy parts. (ii) Inspect the vertical fin vibration absorber installation P/N 109-B810-79-101 for hole elongation; for fretting between the plate and the masses and in-between the masses; for fretting on doubler P/N 109-0372-53-213; and the bolts for scratches and corrosion. If there is any hole elongation; fretting between the plate and the masses or in-between the masses; fretting on doubler P/N 109-0372-53-213; or bolts with scratches or corrosion, before further flight, remove the vertical fin vibration absorber installation P/N 109-B810-79-101 from service. (2) Within 12 months after the effective date of this AD unless already accomplished per paragraph (g)(1)(ii) of this AD, remove the vertical fin vibration absorber installation P/N 109-B810-79-101 from service. (3) As of the effective date of this AD, do not install vertical fin vibration absorber installation P/N 109-B810-79-101 on any helicopter. (4) Removing the vertical fin vibration absorber installation P/N 109-B810-79-101 from service, as described in paragraphs (g)(1)(ii) or (2) of this AD provides a terminating action for the 100 hour TIS repetitive inspections required by paragraph (g)(1) of this AD.
Unsafe condition
This AD defines the unsafe condition as cracks or damage on the vertical fin vibration absorber installation and surrounding structure. This condition could affect the structural integrity of the helicopter and lead to subsequent 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