Airworthiness Directive · Amendment 39-18285 · Nacelles/pylons
Viking Air Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
This AD applies to all Viking Air Limited (Type Certificate previously held by Bombardier, Inc.) Model DHC-7-1 and DHC-7-100 airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all Viking Air Limited (Type Certificate Previously Held by Bombardier, Inc.) Model DHC-7-1 and DHC-7-100 airplanes. This AD was prompted by reports of cracks that were discovered in the outboard nacelles upper longeron channels and angles. This AD requires a one-time detailed visual inspection for cracking in the outboard nacelles upper longeron channels and angles; and repair if necessary. We are issuing this AD to detect and correct cracks in the outboard nacelles upper longeron channels and angles, which could lead to the loss of stiffness in the forward engine mount; and possible catastrophic failure.
Within 6 months after the effective date of this AD, do a one-time detailed visual inspection for cracking in the outboard nacelles upper longeron channels and angles, in accordance with the Accomplishment Instructions of Viking Air Limited Service Bulletin V7-54-02, Revision NC, dated December 14, 2012. If any cracking is found during the inspection required by this paragraph: Before further flight, repair using a method approved by the Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA; or Transport Canada Civil Aviation (TCCA); or Viking Air Limited's (Type Certificate Previously Held by Bombardier, Inc.) TCCA Design Approval Organization (DAO).
