(b)
Heat the sensor probe to a temperature of 230|15°F (110 to 118°C).
(c)
AIRPLANES WITH RAM AIR EXHAUST LOUVERS (PRE-SB 21-1123); Make sure that the inlet modulation panels and the exhaust louvers open.
(d)
AIRPLANES WITHOUT RAM AIR EXHAUST LOUVERS (POST-SB 21-1123); Make sure that the inlet modulation panels open.
(e)
Make sure that the RAM DOOR FULL OPEN lights come on.
(f)
Make sure that the deflector doors stay closed.
(g)
Remove the heat.
(h)
Let the sensors cool.
(i)
AIRPLANES WITH RAM AIR EXHAUST LOUVERS (PRE-SB 21-1123); Make sure that the inlet modulation panels and the exhaust louvers close.
(j)
AIRPLANES WITHOUT RAM AIR EXHAUST LOUVERS (POST-SB 21-1123); Make sure that the inlet modulation panels close.
(k)
Make sure that the RAM DOOR FULL OPEN lights go out.
(l)
Install the 230°F control sensors in the compressor discharge duct of the air cycle machines (AMM 21-52-12/401).
S 715-188
(17) Do a test of the 230°F control sensor using the Digital Multimeter:
(a)
Open the access door for the ram air duct.
(b)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
1) On the main power distribution panel, P6: a) 6E1, AIR COND RAM MOD RIGHT b) 6E2, AIR COND RAM MOD LEFT
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A 737-300/400/500MAINTENANCE MANUAL
TEMPERATURE (`F) Resistance (K Ohms) TEMPERATURE (`F) Resistance (K Ohms)
50 179.5 - 268.1 180 10.7 - 12.2
60 137.8 - 200.7 190 08.9 - 10.0
70 108.0 - 154.0 200 07.4 - 08.3
80 084.4 - 118.2 210 06.2 - 06.7
90 066.7 - 090.7 220 05.4 - 05.9
100 052.7 - 070.2 230 04.6 - 04.9
110 042.0 - 054.8 240 03.9 - 04.2
120 033.8 - 043.2 250 03.3 - 03.6
130 027.5 - 034.4 260 02.8 - 03.1
140 022.5 - 027.7 270 02.4 - 02.7
150 018.6 - 022.4 280 02.0 - 02.3
160 015.4 - 018.2 290 01.8 - 02.0
170 012.8 - 014.9 300 01.5 - 01.8
507090110130150170190210230250270290
300
TEMPERATURE (`F)
RAM AIR TEMPERATURE SENSOR RESISTANCE VS TEMPERATURE GRAPH
Ram Air Temperature Sensor - Temperature and Resistance Data
Figure 502
H75702
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(c) Disconnect the electrical connector D970 (D972) from the left
(right) ram air temperature controller.
NOTE: The ram air temperature controller is located on the____
inboard side of the keel beam and near the ram air
actuator.
(d) Go to the ECS bay and measure the ambient temperature adjacent
to the Ram Air Sensor.
(e) Write down the temperature.
(f) Connect the digital multimeter between electrical connector
D970 (D972), pins 6 and 7 for the left (right) ram air
temperature controller.
(g) Write down the resistance in Kohms that you measure.
(h) Find the temperature on Fig. 502 that is nearest to the
temperature that you wrote down.
(i) Compare the permitted range of resistance for that temperature
to the resistance you wrote down.
(j) If the resistance is out of range, replace the sensor
(AMM 21-52-13/401).
(k) Connect the electrical connector D970 (D972) to the left
(right) ram air temperature controller.
(l) Close these circuit breakers and remove the DO-NOT-CLOSE tags:
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