Maintenance personnel found the clevis pin attaching the mixture linkage to the fuel arm on the fuel control unit
had backed out so that the head of the clevis pin would contact the body of the FCU, thereby limiting throttle travel.
The cause was an engine failure during takeoff, which appeared to have been due to technical problems with the fuel control unit
Removal of original fuel system components including, but not limited to, fuel control unit
, HP fuel pump, hydraulic power pack and actuator for power lever;
Interconnecting shaft between the fuel control unit
(FCU) and engine-driven pump (FCU drive coupling) was found sheared.
Tenders are invited for Annual Maintenance Contract Of Barometric Fuel Control Unit
(Bfcu) Test Rig For 3 Years
Fuel was discovered dripping from the belly, which was traced to a cracked fuel tube at the fuel control unit
(Pratt & Whitney p/n 3033981).