Table 1. Unit Preventive Maintenance Checks and Services (PMCS) for AAFARS (Continued)
Not Fully Mission
14 Annually Pumpage
Perform test of thermostat overtemperature sensor. (WP 0022 00)
sensor damaged or
To avoid injury to personnel, adhere to all safety
requirements and provide adequate ventilation and fire
Check sensor continuity at room temperature before starting test.
Disconnect the overtemperature sensor cable at 1A1J3
receptacle on the engine module.
Using a multimeter, connect the overtemperature sensor
cable leads to the multimeter leads.
Record whether or not the overtemperature sensor is closed
(continuity) or open (no continuity).
If sensor is open, stop test and replace sensor. If sensor is
closed, continue to step 5.
The following steps must be performed in the sequence shown.
Attach thermometer to the top edge and inside of the test
Using electrical tape, attach the sensor to the test container
handle such that the sensor is suspended in the container,
close to, but not touching the thermometer or the bottom of
Fill the test container with water so that the sensor and at
least 2 inches of the thermometer are covered.
Plug the test container into a 110v outlet and connect the
sensor wire leads to the multimeter leads. Observe
temperature and multimeter until the sensor opens and/or
the water heats to +190 F.
If sensor does not open (no continuity) stop test and replace
sensor. If sensor opens, proceed to step 10.
10. Unplug the test container and let water cool to room
temperature (less than +100 F).
11. If sensor does not close (continuity) stop, test and replace
sensor. If sensor closed, proceed to step 12.
12. If the sensor opened (step 8) and closed (step 11), the
sensor is acceptable.
END OF WORK PACKAGE