Airworthiness Directive · Amendment 39-17124 · Main rotor mast/swashplate
Boeing Vertol (Type Certificate Currently Held by Columbia Helicopters, Inc. (CHI)) and Kawasaki Heavy Industries, Limited Helicopters (Kawasaki)
This AD applies to Boeing Vertol (type certificate currently held by Columbia Helicopters, Inc. (CHI)) Model 107-II and Kawasaki Heavy Industries, Limited Model KV107-II and KV107-IIA helicopters with an upper collective pitch control assembly, part number (P/N) 107CK003-2 or 107CK002-2, installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for CHI Model 107-II and Kawasaki Model KV107-II and KV107-IIA helicopters. This AD requires, before further flight, replacing certain upper collective pitch control yoke bolts. This AD is prompted by three failures of the affected bolts. These actions are intended to prevent failure of an upper collective pitch control yoke bolt (bolt), excessive vibration, migration of the shafts, and subsequent loss of control of the helicopter.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
Before further flight, replace bolts, P/N 107C2733-1 and P/N 107C2733-2, with airworthy bolts, P/N C07C2700-1. Torque each nut to 450-500 in-lbs. Do not install a washer, P/N A02C3112-13 with a bolt, P/N C07C2700-1. Do not install bolts, P/N 107C2733-1 and P/N 107C2733-2, on any helicopter.
