(b)
Close all panels as applicable. 1) Remove the heating hose from the service connection for ground air conditioning unit, 1304L. 2) Remove the heating hose in the Forward Equipment Bay,
forward access door, 1103L. 3) Make sure the forward access door, 1103L is closed. 4) Remove the heating hose from the electronic equipment
access door, 1103L. 5) Make sure the electronic equipment access door, 1201L is closed.
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737-300/400/500MAINTENANCE MANUAL
(c)
Make sure the outflow valves are in the OPEN position.
(d)
Start the APU with the battery or ground power (AMM
49-11-00/201).
(e)
737-300 AND 737-500; Make sure the recirculation fan switch, RECIRC FAN, is in the AUTO position.
(f)
737-400; Make sure the recirculation fan switches, L RECIRC FAN and R RECIRC FAN, are in the AUTO position.
(g)
Close the pack and zone temperature control circuit breakers if they are open.
(h)
Put all zone temperature selectors in the 12 o'clock position.
(i)
737-400;
Make sure the Trim Air switches are ON.
(j)
Turn the left and right pack switches to AUTO.
S 863-046
CAUTION: DO NOT CYCLE THE CONTROL COLUMN, WHEEL, RUDDER PEDALS, BRAKE
_______ PEDALS, GROUND SPOILERS, STABILIZER OR FLAPS UNTIL THE PUMPS HAVE RUN FOR AT LEAST 15 MINUTES.
(7) Turn on the hydraulic system electric motor pumps 30 minutes before starting the engines.
NOTE: This will make sure the hydraulic system operates normally
____
and will prolong the life of the components.
(a)
Use alternating current motor pump to pressurize the main hydraulic system (AMM 29-15-00/201).
(b)
Select these electric to the ON position, on the overhead Hydraulic Control Panel. 1) HYD PUMPS ELEC 1 2) HYD PUMPS ELEC 2
(c)
Leave the motor pumps running until the engine-driven pumps are operating.
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(d) If the hydraulic pressure in one system increases, then drops to zero, do these steps:
NOTE:____Repeat the steps a maximum of three times. After three times (cycles), you must find the cause of the pressure drop.
1) Turn the electric motor pump OFF.
2) Turn the electric motor pump ON.
S 863-047
(8) Do these functions of the flight control systems:
(a) Slowly (1 to 2 seconds), move the control column, wheel, rudder pedals, and the ground spoilers.
NOTE: You must complete at least 10 cycles of each control to
____
near full travel.
1) Verify that the movement of the flight control systems are normal.
(b)
Run the stabilizer trim full travel nose up and nose down using the column trim switch.
(c)
Select the flaps to the full down position.
NOTE: Wait for the flaps to reach the full down position.
____
(d) Select the flaps to the full up position.
NOTE: Wait for the flaps to reach the full up position.
____
(e) Prepare for the autopilot check (AMM 22-10-00/501).
1) Set the autopilot stab trim cutout switch, on the control stand, to the CUTOUT position.
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM THE FLIGHT
_______ CONTROL SURFACES. THE AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, STABILIZER AND NOSE GEAR CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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