(c)
Subtract 4.07 in. Hg. from the local barometric pressure.
1) Apply the result to the No. 1 auxiliary static system as absolute pressure.
(d)
Make sure the differential pressure indicator is 2.0 |0.2 psi.
NOTE: Hit the indicator lightly on the case, not the glass
____ dial cover, before you read the value.
(e)
Subtract 10.18 inches of Hg from the local barometric pressure.
1) Apply the result to the No. 1 auxiliary static system in absolute pressure.
(f)
Make sure the differential pressure indicator is 5.0 |0.2 psi.
NOTE: Hit the indicator lightly on the case, not the glass
____ dial cover, before you read the value.
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A
737-300/400/500MAINTENANCE MANUAL
G. Put the Airplane Back to Its Usual Condition
S 865-067
(1)
Remove the pressure on the pitot-static lines.
S 845-068
(2)
Disconnect the test equipment.
S 085-069
(3)
Remove the seals from the airplane's static lines.
NOTE: Make sure there are no unwanted materials in or around the
____
static ports.
S 865-070
(4)
Open the NO. 1 AIR DATA COMPUTER-1 and TEMP PROBE circuit breakers on the load control panel, P18.
S 865-071
(5)
Open the NO. 2 AIR DATA COMPUTER-2 circuit breakers on the load control panel, P6.
S 865-072
(6)
Disconnect the decade resistance box from connector D277.
S 865-073
(7)
Connect D277 to the TAT probe.
S 865-074
(8)
Close the circuit breakers for the air data systems on the load control panels, P6 and P18.
S 865-075
(9)
Open these circuit breakers on the load control panel, P18: CAPTAIN'S UPPER L F/O LWR L ELEVATOR PITOT L ALPHA VANE HTR L
(10)
Remove all protective caps or covers from the temperature probes.
S 085-076
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737-300/400/500MAINTENANCE MANUAL
S 975-092
(11)
Read and write the TAT value. S 865-093
(12)
Put the PITOT STATIC HEAT A switch on the pilot's overhead panel, P5, to ON.
WARNING:_______ DO NOT TOUCH THE TEMPERATURE PROBE WHILE THE HEATER IS ON.
HEATER TEMPERATURE CAN BE LARGER THEN 200°F (94°C) AND CAN
CAUSE INJURIES
CAUTION:_______ DO NOT OPERATE THE HEATER FOR MORE THAN 5 MINUTES WHILE THE
AIRPLANE IS ON THE GROUND. EXTENDED OPERATION CAN DECREASE
HEATER LIFE.
(a) Make sure the TAT value increases when the heater is warm.
NOTE: To test for heat, put your hand near the probe.
____
(b) Make sure the TEMP PROBE light goes out.
S 865-135
(13)
Put the PITOT STATIC HEAT A switch on the pilots' overhead panel, P5, to OFF.
S 865-083
(14)
Close the heater circuit breakers on the load control panel, P18.
S 865-085
(15)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
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