Thu, Apr 12, 2012
AD NUMBER: 2012-07-04
PRODUCT: Certain Cessna Aircraft Company Model 680 airplanes
SUBJECT: Airworthiness Directive 2012-07-04
ACTION: Final Rule
SUMMARY: This AD was prompted by a false cross-feed command to the righthand fuel control card, due to the cross-feed inputs on the left- and right-hand fuel control cards being connected together and causing an imbalance of fuel between the left and right wing tanks.
This AD requires adding diodes to the fuel cross-feed wiring, and revising the airplane flight manual to include procedures to use when the left or right generator is selected OFF.
The FAA is issuing this AD to prevent lateral imbalance of the airplane, resulting from uncontrolled fuel cross-feed, which can be corrected by deflecting the aileron trim; deflecting the aileron trim increases the pilot's workload and could exceed the airplane's limitation in a short period of time, resulting in reduced controllability of the airplane.
DATES: This AD is effective May 15, 2012.
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