Airworthiness Directive · Amendment 39-9003 · Viking Air Limited Airplanes
Viking Air Limited Airplanes
This AD applies to Viking Air Limited DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, DHC-7-103.
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 adopts a new airworthiness directive (AD), applicable to all de Havilland Model DHC-7 series airplanes, that requires removal of the aluminum or brass hardware in the firewall terminal block assembly and replacement with steel hardware. This amendment is prompted by the results of an investigation, which revealed that corroded aluminum washers in the DC firewall terminal block assembly may loosen the electrical connections. The actions specified by this AD are intended to prevent interruption of DC electrical power due to connections that may have loosened from corrosion.
