Airworthiness Directive · Amendment 39-15839 · Lights
Viking Air Limited Model DHC-7 Airplanes
This AD applies to Viking Air Limited Model DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, and DHC-7-103 airplanes, certificated in any category; serial numbers 1 through 113 inclusive, with Modifications 7/2444 and 7/2445 incorporated.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions.
(1) Within 1,000 flight hours after the effective date of this AD: Perform a visual inspection to ensure proper installation and functioning of the fluorescent tubes in the lamp holders, and perform all applicable corrective actions before further flight, in accordance with the Accomplishment Instructions of Viking Service Bulletin V7-33-01, dated February 28, 2008. Repeat the inspection thereafter at intervals not to exceed 1,000 flight hours.
(2) Replacing all fluorescent lamp ballasts having part number (P/N) BAO8006-1 and BA[O]8006-28-1 with new fluorescent lamp ballasts having P/N BR9000-21, in accordance with the Accomplishment Instructions of Viking Service Bulletin V7-33-01, dated February 28, 2008, terminates the repetitive inspections required by paragraph (f)(1) of this AD.
Note 1: This AD differs from the MCAI and/or service information as follows: No differences.
