Mon, Apr 23, 2012
AD NUMBER: 2012-06-20
PRODUCT: Certain Fokker Services B.V. Model F.28 Mark 0070 and 0100 airplanes.
SUBJECT: Airworthiness Directive 2012-06-20
ACTION: Final Rule
SUMMARY: This AD was prompted by a report that the fuel crossfeed valves cannot be controlled when only emergency electrical power is available, that an unwanted configuration of the indication logic for the fuel fire shutoff valve was introduced during production, and that current fuel crossfeed indications are based on selection by the flightcrew instead of actual position of the crossfeed valve actuators.
This AD requires modifying the crossfeed valve control and power supply, the crossfeed indication logic and power supply, and the indication logic for the fuel fire shutoff valve; modifying the overhead panel; and for certain airplanes, modifying the transfer logic of the center wing fuel tank.
The FAA is issuing this AD to prevent failure of an in-flight engine relight following a double engine flame-out event, which could result in loss of the airplane.
DATES: This AD becomes effective May 24, 2012.
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