Thrush Aircraft S2R–T660 Maintenance Manual page 136

THRUSH AIRCRAFT INC - T660 TURBO THRUSH
Important Note: with the ferry fuel selector in hopper position, drain all
trapped air from the hopper fuel line by operating the fuel filter drain
located on L/H shin skin forward of firewall (see Fig. 5-1). Unless this
procedure is followed after each refueling, the engine may flameout
when hopper fuel is selected in flight.
G. Never use the hopper as a fuel tank unless it is completely clean and dry.
H. Remove these instructions from the cockpit only after removal of the ferry
fuel system from the aircraft.
Effective: 12/17/03
AIRCRAFT MAINTENANCE MANUAL
5 -18