ICA-D212-725 (28)
Page 11 of 48
CHAPTER 28 – FUEL SYSTEM (28-00-00)
COPYRIGHT
2007 BY DART AEROSPACE LTD.
THIS DOCUMENT IS PRIVATE AND CONFIDENTIAL AND IS SUPPLIED ON THE EXPRESS CONDITION THAT IT IS NOT TO BE USED FOR ANY PURPOSE OR COPIED OR COMMUNICATED TO ANY
OTHER PERSON WITHOUT WRITTEN PERMISSION FROM DART AEROSPACE LTD.
Revision:
6
Date: 13.08.26
28.5 TROUBLESHOOTING FUEL SYSTEM
Table 28-2.
Troubleshooting fuel system.
INDICATION OF TROUBLE
PROBABLE CAUSE
CORRECTIVE ACTION
FUEL FILTER caution panel
segment illuminated.
Fuel
filter
is
dirty.
Replace filter. If frequent filter
changes are required, investigate fuel
source.
FUEL BOOST caution panel
segment illuminated.
Obstructed pump line through
flow switch and ejector pump.
Clean screen in pump outlet fitting or
replace flow switch or ejector pump or
obstructed hoses.
No electrical power to pump.
Repair wiring or replace faulty units in
circuit.
Defective boost pump.
Replace pump.
Shutoff valve inoperative.
Valve faulty or lacking electrical
power.
Repair circuit or replace valve.
Engine fuel pump warning
light illuminated.
One of the two pressure switches
mounted on the engine adjacent
to the fuel pump is faulty.
Check switches and replace faulty
switch.
One of the two engine driven
fuel pumps is faulty.
Replace engine-driven fuel pump.
FUEL LOW caution panel
segment when fuel is not low or
fails to illuminate when fuel is
low.
Defective float switch or wiring.
Replace float switch. Repair wiring.
FUEL LOW caution panel
segment when fuel is above
10% fuel remaining (of basic
fuel system) Approximately 150
pounds total, 75 pounds each
side.
Lower fuel cell flapper valves.
Check flapper valves for correct
installation and operation. Replace
flapper valves if defective.
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