3. Replace an Engine Indicator Gauge Sensor/Transducer
A. Replace the Oil Temperature Sensor
Detail Steps/Work Items Key Items/References
WARNING: MAKE SURE THE ENGINE IS SAFE BEFORE YOU DO ANY WORK ON IT. IF THE ENGINE STARTS THE PROPELLER CAN CAUSE INJURY OR DEATH.
(1) Make sure that the engine is safe: S The ignition switch is set to OFF. S Set the ALT/BAT switch to OFF. S The throttle is set to IDLE. S The mixture control is set to LEAN CUT-OFF.
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Detail Steps/Work Items Key Items/References
(2) Remove the engine top-cowling. Refer to Section 71-10.
(3) Disconnect the airplane battery. Refer to Section 24-31.
(4) Disconnect the electrical cables from the temperature sensor: S Remove the nut and washer from the electrical connector. S Remove the cable eye-end from the connector.
WARNING: DO NOT GET OIL ON YOU. OIL CAN CAUSE SKIN DISEASE.
(5) Replace the oil temperature sensor: S Remove the sensor. S Remove and discard the O-ring seal. S Install a new O-ring seal. S Install a new sensor. On the engine accessory housing.
(6) Connect the electrical cable to the sensor: S Put the electrical cable eye-end in position on the connector. S Install the washer and nut onto the electrical connector.
(7) Connect the airplane battery. Refer to Section 24-31.
(8) Install the engine cowlings. Refer to Section 71-10.
(9) Do a test of the engine oil temperature indicating system: S Monitor the oil temperature indication. S Set the ALT/BAT switch to ON. S Do an engine ground run-up. S Shut the engine down. The indicator must show the likely ambient temperature of the oil. Refer to the DA 40 Airplane Flight Manual. The oil temperature indicator must show the relevant temperature of the oil.
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Detail Steps/Work Items Key Items/References
(9) Look for oil leaks from the sensor: S Remove the engine top-cowling. S Look for oil leaks from the sensor. S Install the engine top-cowling.
B. Replace the Fuel Flow Sensor
Detail Steps/Work Items Key Items/References
WARNING: MAKE SURE THE ENGINE IS SAFE BEFORE YOU DO ANY WORK ON IT. IF THE ENGINE STARTS THE PROPELLER CAN CAUSE INJURY OR DEATH.
(1) Make sure that the engine is safe: S The ignition switch is set to OFF. S Set the ALT/BAT switch to OFF. S The throttle is set to IDLE. S The mixture control is set to LEAN CUT-OFF. S Set the fuel shut-off to SHUT-OFF.
(2) Remove the engine cowlings. Refer to Section 71-10.
(3) Disconnect the airplane battery. Refer to Section 24-31.
(4) Disconnect the electrical connector from the sensor. Refer to Figure 3.
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.
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Detail Steps/Work Items Key Items/References
(5) Replace the fuel flow sensor: S Disconnect the fuel hose from the inlet side of the fuel flow sensor. S Disconnect the fuel hose from the outlet side of the fuel flow sensor. S Remove the 2 bolts and washers that attach the fuel flow sensor to the mounting bracket Move the fuel flow sensor clear of the airplane. S Put the new fuel flow sensor into position on the bracket and install the bolts and washers that attach the sensor to the bracket. S Connect the fuel hose to the outlet side of the fuel flow sensor. S Connect the fuel hose to the inlet side of the fuel flow sensor. Use a suitable container to collect spilt fuel. Put a cap on open connections.
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