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Wed, Jul 10, 2013

AD: Various Restricted Category Helicopters

AD NUMBER: AD 2013-13-14

PRODUCT: Various restricted category Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P helicopters with certain main rotor hub inboard strap fittings (fittings) installed.
SUBJECT: Airworthiness Directive AD 2013-13-14
ACTION: Final Rule, Request for Comments

SUMMARY: This AD requires a magnetic particle inspection (MPI) of the fittings for a crack, and if there is a crack, replacing the fitting with an airworthy fitting. This AD is prompted by reports of cracked fittings on Bell model helicopters and the determination that these same part-numbered fittings may be installed on various restricted category helicopters.

These actions are intended to detect a crack in a fitting, which may lead to failure of a fitting, loss of a main rotor blade, and subsequent loss of helicopter control.

DATES: This AD becomes effective July 24, 2013. Comments must be received by September 9, 2013.

FMI: AD

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