Emergency AD for Tail Rotor Blades on Bell Helicopters

AD 2010-26-51 for Bell Helicopter Models 206A, 206B, 206L, 206L-1, 206L-3,
206L-4, 407, 427, 222, 222B, 222U, 230, 430

This superseding Emergency Airworthiness Directive (AD) is prompted by
another incident in which the tail rotor blade (blade) tip weight separated
from a blade during flight causing vibration. This unsafe condition led to
the determination that additional blades could be affected and should be
added to the applicability. The actions specified by this AD are intended to
prevent loss of the blade tip weight, loss of a blade, and subsequent loss
of control of the helicopter.

On March 26, 2009, the FAA issued AD 2009-08-03, Amendment 39-15876 (74 FR
16112, April 9, 2009). AD 2009-08-03 requires, before further flight,
removing and replacing each affected blade with an airworthy blade. That
action was prompted by three reports of blade tip weights being slung from
the blades during flights, causing significant vibration.

Since issuing AD 2009-08-03, BHTC has revised the Alert Service Bulletins
(ASBs) based on revisions to the Rotor Blades Inc. (RBI) documents that are
attached to the ASBs.

Each ASB contains an RBI letter that adds blade serial numbers to the RBI
No. 206-07-116, Revision B, for Model 206A/B series helicopters;
No. 206L-07-148, Revision B, for Model 206L series helicopters;
No. 222-07-106, Revision D, for Model 222 and 222B helicopters;
No. 222U-07-77, Revision D, for Model 222U helicopters;
No. 230-07-38, Revision D, for Model 230 helicopters;
No. 407-07-81, Revision B, for Model 407 helicopters;
No.427-07-18, Revision B, for Model 427 helicopters;
No. 430-07-41, Revision D, for Model 430 helicopters.

pdf icon2010-26-51_emergency.pdf

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