AD NUMBER: 2018-04-02

PRODUCT: Viking Air Limited Models DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300, and DHC-6-400 airplanes.

ACTION: Final Rule.

SUMMARY: This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and address an unsafe condition on an aviation product.

The MCAI describes the unsafe condition as aileron cable wear; fouling at the wing root rib, fuselage skin, and wing root rib fairlead; and/or fraying of the cable from the root rib fairlead.

DATES: This AD is effective March 27, 2018.

COST: The FAA estimates that this AD will affect 141 products of U.S. registry. Compliance with the basic requirements of the AD will take an estimated 20 work-hours per product to comply with the basic requirements of this AD. The average labor rate is $85 per work-hour.
Based on these figures, the estimated cost of this AD on U.S. operators to be $1,700 per product.

In addition, the following is an estimate of possible necessary follow-on replacement actions:

• Replace One Cable - $754 per aircraft for parts and labor
• Replace 2 cables (on the same wing) - $1,138 per aircraft for parts and labor
• Replace 2 cables (one on each wing) - $1,508 per aircraft for parts and labor
• Replace all 4 cables (2 per wing) - $2,336 per aircraft for parts and labor

FMI: AD