Airworthiness Directive · Amendment 39-9358 · Viking Air Limited Airplanes
Viking Air Limited Airplanes
This AD applies to Viking Air Limited DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment supersedes Airworthiness Directive (AD) 73-05-03, which currently requires repetitively inspecting the rear spar cap for cracks on certain de Havilland DHC-6 series airplanes, and replacing any cracked rear spar cap. The Federal Aviation Administration's policy on aging commuter-class aircraft is to eliminate or, in certain instances, reduce the number of certain repetitive short-interval inspections when improved parts or modifications are available. This action requires modifying the wing rear spar support (Modification No. 6/1301) as terminating action for the currently required repetitive inspections. The actions specified by this AD are intended to prevent cracking of the top flange of the wing spar attachment caps, which, if not detected and corrected, could result in loss of control of the airplane.
