60 140
40 104
20 68
0 32
-20 -4
-40400 450 500 550 600 650 -40
DEGREES CENTIGRADE
DEGREES FAHRANHEIT
RESISTANCE - OHMS
Temperature - Resistance Graph
Figure 501
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737-300/400/500MAINTENANCE MANUAL
S 705-022
(9) Make sure the resistance is approximately 20 ohms at ambient temperature between 60 and 90°F.
NOTE: The resistance must be less at low temperatures and higher at
____
high temperatures.
S 225-024
(10)
Measure the resistance from pin 1 or 6 to the TAT probe case.
S 705-026
(11)
Make sure the resistance is larger than 5 megohms.
S 415-027
(12)
Connect the electrical connector to the TAT probe.
TASK 34-12-31-715-028
3. Total Air Temperature Probe Heater Test
_______________________________________
A. Reference
(1) AMM 24-22-00/201, Manual Control
B. Access
(1) Location Zones
101/102 Flight Compartment
C. Prepare for Test
S 865-030
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-031
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P18 Load Control Center
1) A8, COMPUTER-1 AC
2) A9, COMPUTER-1 (26V AC)
(b)
P6 Load Control Center
1) B6, COMPUTER-2 26V AC
2) B7, COMPUTER-2 AC
S 865-032
(3) Open these circuit breaker and attach DO-NOT-CLOSE tags:
(a) P18 Load Control Center
1) C1, CAPT UPPER L
2) C4, F/O LWR L
3) D2, ELEVATOR PITOT L
4) D5, ALPHA VANE HTR L
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737-300/400/500MAINTENANCE MANUAL
S 865-033
(4) Remove the dust caps from the TAT probe.
D. Total Air Temperature Probe Heater Test
S 975-034
(1) Make a note of the TAT value.
S 865-045
WARNING:_______DO NOT TOUCH TEMPERATURE PROBE WHILE HEATER IS ON. PROBE TEMPERATURE IN STILL AIR MAY EXCEED 200°F (94°C). HEATERS MAY BE TESTED FOR OPERATION BY FEELING FOR HEAT RADIATION IN THE NEAR VICINITY OF THE PROBE TO AVOID POSSIBILITY OF PERSONNEL BEING BURNED.
CAUTION: DO NOT OPERATE HEATER FOR MORE THAN 5 MINUTES WHILE AIRPLANE IS
_______ ON THE GROUND. EXTENDED OPERATION MAY SHORTEN HEATER LIFE.
(2) Put the PITOT STATIC HEAT A switch on the pilots overhead panel, P5, to ON. (a) Make sure the light on the TEMP PROBE indicator goes off.
(3) S 215-037Make sure the TAT value increases after a sufficient amount of time.
(4) S 865-042Put the PITOT STATIC HEAT A switch to OFF.
(5) S 865-043Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P18 Load Control Center 1) C1, CAPT UPPER L 2) C4, F/O LWR L 3) D2, ELEVATOR PITOT L 4) D5, ALPHA VANE HTR L
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