Airworthiness Directive · Amendment 39-15555 · Engine ignition
Viking Air Limited Models DHC-2 Mk. I, DHC-2 Mk. II, and DHC-3 Airplanes
This AD applies to the following model and serial number airplanes certificated in any category:
| Model | Serial No. |
|---|---|
| DHC-2 Mk. I | All. |
| DHC-2 Mk. II | All. |
| DHC-3 | All serial numbers with piston engines. |
We are superseding an existing airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued 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:
Inspect the connector plugs on the fore side of the firewall for security and the connector plug lockwire to assure it is intact and the holes in the plugs are not broken out or cracked. Initially inspect within the next 100 hours time-in-service (TIS) after December 6, 2004 (the compliance date retained from AD 2004-21-06). Repetitively inspect thereafter at intervals not to exceed 100 hours TIS until the modification required in paragraph (h) of this AD is done. Do the inspections following deHavilland Beaver Alert Service Bulletin Number A2/53, Revision B, dated May 28, 2004; and deHavilland Otter Alert Service Bulletin Number A3/53, Revision B, dated May 28, 2004, as applicable.
(g) During any inspection required in paragraph (f) of this AD, if the lockwire holes or the lockwire is found damaged, install Modification Kit Number C2VMK0001-1 or Modification Kit Number C3VMK0001-1, as applicable. Install the modification kit before further flight following the Accomplishment Instructions in Viking DHC-2 Beaver Service Bulletin Number V2/0001, dated June 27, 2007; and Viking DHC-3 Otter Service Bulletin Number V3/0001, dated June 27, 2007, as applicable. Installing the modification kit terminates the repetitive inspections required in paragraph (f) of this AD.
(h) Unless already done, replace the magneto firewall connector by installing Modification Kit Number C2VMK0001-1 or Modification Kit Number C3VMK0001-1, as applicable. Install the modification kit within the next 6 months after July 23, 2008 (the effective date of this AD) following the Accomplishment Instructions in Viking DHC-2 Beaver Service Bulletin Number V2/0001, dated June 27, 2007; and Viking DHC-3 Otter Service Bulletin Number V3/0001, dated June 27, 2007, as applicable. Installing the modification kit terminates the repetitive inspections required in paragraph (f) of this AD.
Note: This AD differs from the MCAI and/or service information as follows: AD 2004-21-06 required incorporating repetitive inspections of the connector plugs and the connector plug lockwire on the fore side of the firewall into the maintenance program while the MCAI required incorporating Temporary Revision No. 14, dated August 24, 2001, into the applicable maintenance manual in order to incorporate the repetitive inspections into the maintenance program.
