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Fri, Jan 04, 2008

AD: Robinson Helicopter

AD NUMBER: 2007-26-12
MANUFACTURER: Robinson Helicopter
SUBJECT: Airworthiness Directive 2007-26-12
SUMMARY:
This amendment adopts a new airworthiness directive (AD) for the specified Robinson Helicopter Company (Robinson) helicopters. This action requires a one-time visual inspection for skin separation along the leading edge of blade skin aft of the skin-to-spar bond line on the lower surface of each blade and in the tip cap area.

This action also requires a 'tap test' for detecting a separation or void in both bonded areas. This action also requires repainting any exposed area of the blades.

If any separation or void is detected, replacing the blade before further flight isrequired. Thereafter, before each flight, this AD also requires checking for any exposed (baremetal) along the skin-to-spar bond line on the lower surface of each blade near the tip.

If any bare metal is found, a mechanic must inspect the area. This amendment is prompted by 11 reports ofblade debond, some occurring in flight causing the pilot to feel excessive vibrations and land, and some found during routine maintenance.

The actions specified in this AD are intended to detect blade skin debond and to prevent blade failure and subsequent loss of control of the helicopter.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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