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indicator shows the fuel quantity of the long range chamber only digitally, in US Gallons.
The fuel sensor operates a caution light on the annunciator panel. When the fuel level in the left tank
or the right tank falls below 3 US gal (±1 US gal) the caution light comes on. Refer to Section 31-50 for
more data on the low fuel caution light.
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-40-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the fuel quantity indicating system. If you have the
trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair
given in the Repair column.
Trouble Possible Cause Repair
Fuel quantity indication for one
tank incorrect/blank, other tank
reads correctly.
Fuel probe unit in fuel tank
defective/contaminated.
Fuel quantity indication system
wiring defective.
Defuel/refuel the related tank to
flush the fuel probe. If the
indication is still incorrect then
replace the fuel probe.
Do a test of the indication
system wiring. Refer to Chapter
92-00 for the wiring diagrams.
Fuel quantity indication on both
tanks incorrect/blank.
Fuel quantity indicator
defective.
Fuel quantity indication system
wiring defective.
Engine integrated indicating
system defective.
Replace the fuel quantity
indicator.
Do a test of the indication
system wiring. Refer to Chapter
92-00 for the wiring diagrams.
Refer to the system
manufacturer's manuals.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 102
20 Sep 2007 28-40-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-40-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
The maintenance practices in this Section tell you how to replace a fuel tank probe and a fuel tank
sensor.
Refer to Section 31-10 for data on removing/installing a fuel quantity indicator.
Obey the safety precautions for fuel at all times.
WARNING: DO NOT GET FUEL ON YOU. FUEL CAN CAUSE SKIN DISEASE.
WARNING: DO NOT ALLOW FIRE NEAR FUEL. FUEL BURNS AND CAN CAUSE
INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
WARNING: DO NOT BREATH FUEL VAPOR. FUEL VAPOR CAN MAKE YOU ILL.
2. Remove/Install a Fuel Tank Sensor
Obey the safety precautions for fuel at all times.
A. Remove a Fuel Tank Sensor
Detail Steps/Work Items Key Items/References
(1) Defuel the wing that has the fuel tank sensor that
you will remove.
Refer to Section 12-10.
(2) Remove the inboard access panel for the fuel
tank.
Refer to Section 52-40.
(3) Disconnect the electrical cables for the sensor. At the in-line connector.
(4) Remove the sensor from the tank.
(5) Remove and discard the O-ring seal from the
sensor.
AIRCRAFT
Fuel System
DA 40 Series
AMM
Page 202
20 Sep 2007 28-40-00 Doc # 6.02.01
Rev. 5
B. Install a Fuel Tank Sensor
Detail Steps/Work Items Key Items/References
(1) Install a new O-ring seal onto the sensor.
(2) Install the sensor in the fuel tank:
S Apply sealant to the thread of the sensor.
S Move the sensor into position in the fuel tank
mount.
S Screw the sensor fully home into the mount.
S Tighten the sensor.
Use 'seal-lube' or 'fuel-lube'.
Make sure that the O-ring is correctly
positioned.
(3) Connect the electrical cables to the sensor. At the in-line connector.
(4) Do a test for the correct operation of the fuel
sensor:
S Set the airplane ALT/BATT switch to ON.
S Monitor the low fuel caution light on the
annunciator panel.
S Put 4 US gallons of fuel into the fuel tank that
has the fuel sensor that you will test.
S Set the airplane ALT/BATT switch to OFF.
The low fuel caution message must be
activated.
The low fuel caution message must
disappear.
(5) Refuel the airplane. Refer to Section 12-10.
(6) Do a check for leaks at the fuel sensor
installation.
(7) Install the inboard access panel for the fuel tank. Refer to Section 52-40.
AIRCRAFT
DA 40 Series
AMM
Fuel System
Doc # 6.02.01
Rev. 5 28-40-00 Page 203
20 Sep 2007
3. Remove/Install a Fuel Tank Probe
Obey the safety precautions for fuel at all times.
A. Remove the Fuel Tank Probe from the Inboard Fuel Chamber
Detail Steps/Work Items Key Items/References
(1) Defuel the wing that has the fuel tank sensor that
　
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