Airworthiness Directive · Amendment 39-18202 · Main rotor mrb
Kaman Aerospace Corporation (Kaman) Helicopters
This AD applies to Kaman Aerospace Corporation (Kaman) Model K-1200 helicopters with a main rotor blade (MRB) part number K911001-009, K911001-010, K911001-109, or K911001-110 installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for Kaman Model K-1200 helicopters with certain main rotor blades (MRB) installed. This AD requires inspecting each MRB for a crack or damage. This AD was prompted by a report that a crack was found on an MRB during a tear-down inspection. The actions are intended to detect a crack in the MRB, which could lead to failure of the MRB 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.
(1) Before the MRB reaches 3,000 hours time-in-service (TIS) or within 50 hours TIS, whichever occurs later, and thereafter at intervals not exceeding 1,000 hours TIS:
(i) X-Ray inspect each MRB between station (STA) 30 and 289 for a crack, a wood split, a void, and delamination.
(ii) Using a 10X or higher power magnifying glass, inspect each spar plank between STA 33 and STA 78 for a wood split or a crack, and inspect each spar plank to plank glueline for a void or delamination.
(2) If there is a crack, wood split, void, or delamination within maximum repair damage limits in an MRB, before further flight, repair the MRB. If there is a crack, wood split, void, or delamination exceeding maximum repair damage limits in an MRB, before further flight, replace the MRB with an airworthy MRB.
(3) Each inspection and repair procedure required for compliance with Paragraphs (e)(1) and (e)(2) of this AD must be accomplished by a method approved by the Manager, Boston Aircraft Certification Office (ACO). For a repair method to be approved by the Manager, Boston ACO, as required by this AD, the Manager's approval letter must specifically refer to this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
