THRUSH S2R – G10 Maintenance Manual page 94

AIRCRAFT MAINTENANCE MANUAL
TABLE 5-2: FUEL SYSTEM TROUBLE SHOOTING CHART (Continued)
PROBLEM
Fuel starvation
after starting.
No fuel flow
when auxiliary
pump is on.
Fuel flow
indicator
inoperative.
(Optional Equip)
Fuel flow
Indicator comes
on but will not
show fuel flow.
(Optional Equip)
Any time you have to replace either the fuel flow indicator or the transducer,
you must be sure to have the unit calibrated to same K factor as set by the
manufacturer. It will cause bad indications if mismatched K factors are installed
together.
Effective: 3/26/2010
THRUSH AIRCRAFT, INC – MODEL S2R G10
PROBABLE CAUSE
Partial fuel flow from
the preceding causes.
Malfunction of engine-
driven fuel pump.
Fuel vents plugged.
Defective electric
auxiliary fuel pump
switch.
Open or defective
circuit breaker.
Loose connections or
open circuit.
Defective auxiliary fuel
pump.
Defective engine-
driven fuel pump by-
pass valve.
No voltage to
indicator.
Bad wires to
transducer or
defective transducer.
*NOTE*
REMEDY
Use the preceding isolation procedures,
checking for sufficient rate of flow. Using
the preceding remedies.
Check pump outlet during starting.
Replace fuel pump. See Section IV.
Check ram air inlet for blockage.
Pressure check each vent line. Clean or
replace vent line.
Check continuity of switch. Replace
defective switch.
Check visually. If not open, check
continuity. Reset. Replace if defective.
Check connections and wiring. Tighten
connections; repair or replace wiring.
Disconnect outlet line. With proper fuel
supply to pump, fuel under pressure
should flow from outlet. Replace
defective pump.
Check pump outlet during starting. See
Section IV and replace fuel pump if by-
pass valve is defective or installed
backwards.
Check voltage and ground wire. If voltage
is present and ground is good, replace
indicator, maintaining the same K factor.
To check transducer, remove four screws
holding wire housing to flow vane
housing. With battery power on, pass
screwdriver back and forth over wire
housing pickups. You should get a
reading on indicator. If no reading,
replace units.
5-15
Page