AD NUMBER: 2008-12-12
MANUFACTURER: Viking Air Limited
SUBJECT: Airworthiness Directive 2008-12-12 SUMMARY: 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: A complete
loss of both ignition systems occurred on a DHC-3 Otter when the
lock wire hole in the ignition connector plug on the firewall broke
out, allowing the plug to vibrate loose. A maintenance safety
feature grounds out both magneto systems through a spring-loaded
safety pin incorporated into the Cannon plug. The DHC-2 system is
similar in design. Subsequent to the issuance of AD CF-2001-36 a
complete loss of both ignition systems occurred on a DHC-2 Beaver
resulting in engine failure and subsequentforced approach and
landing. Investigation by the Transportation Safety Board
determined the internal failure of the magneto firewall connector
resulted in both magneto 'P' leads shorting to ground. A
maintenance 'safety' feature through a spring-loaded safety pin
incorporated in thefirewall connector on many DHC-2 aircraft
grounds out both magneto systems when the connector is
disconnected. This connector type is readily identified when
disconnected by the existence of three internal pins on the
firewall and magneto harness side, one of which is shorted directly
to ground. We are issuing this AD to require actions to correct the
unsafe condition on these products.
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