(b)
Put the stabilizer trim in the green band (the indicator is on the control stand).
(c)
Set the aileron trim to zero (the indicator is on the control wheel).
(d)
Set the rudder trim to zero (on the P8 panel).
(e)
Put the antiskid switch (on the P2 panel) in the OFF position.
(f)
Put the yaw damper switch (on the P5 panel) in the OFF position.
(g)
Put the A/P ENGAGE switches (on the mode control panel) in the OFF position.
(h)
Put the LANDING GEAR handle (on the P2 panel) in the OFF position.
(i)
Put the SPEED BREAK lever (on the control stand) in the DOWN position.
(j)
Put the FLT CONTROL and SPOILER switches (on the P5 panel) in the OFF position.
(k)
Set the flap control lever to 25 units and let the flaps move.
(l)
Open these circuit breakers and attach DO-NOT-CLOSE tags: 1) P6-11 panel a) STBY HYD PUMP NORMAL
2) P6-12 panel
a) STBY HYD PUMP ALTERNATE
(m)
Put the arm switch for the ALTERNATE FLAPS in the ARM position.
(n)
Set the flap control lever to 40 units (the flaps will not move).
S 216-024
(16)
Make sure that the A and B hydraulic systems have a pressure of 2800 psi minimum.
S 866-025
(17)
Remove hydraulic power from hydraulic systems A and B (AMM 29-15-00/201).
(a) Twenty seconds after you remove hydraulic power, make sure hydraulic systems A and B have a minimum of 200 psi remaining in them. 1) If the pressure in system B is less than 200 psi, use the
trouble-shooting procedure (in the General information above) to find the bad parts. Some parts to examine are the relief valve in the B system pressure module, and the check valves in the system.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
2) If the pressure in system A is less than 200 psi, use the trouble-shooting procedure (in the General information above) to find the bad parts. Some parts to examine are the relief valve in the A system pressure module, the check valves in the system, and the ground spoilers (No. 0, 1, 4, 5, 8, and 9).
S 866-026
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES. THE AILERONS, RUDDER, ELEVATOR, FLAPS, SLATS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(18) Supply hydraulic power to hydraulic system B (with the equipment for measuring flow installed) (AMM 29-15-00/201).
TASK 29-00-00-796-027
4. Gross Internal Leak Check (Procedure 1)_________________________
A. General
(1)
Use this procedure to find the total internal leakage of the A or B hydraulic system.
(2)
You must find the changes in the flow of hydraulic fluid (during different conditions of operation) to find the internal leakage rate for each part. There are three procedures to measure the flow: the ammeter procedure, the flowmeter procedure, and the amp-clamp and multimeter procedure.
(a)
To use the ammeter procedure, you connect an ammeter in series with one phase of the motor on the electric motor-driven pump (EMDP). To find the flow you measure the current subtract the basic current and use Figure 603 to change it to a flow.
(b)
To use the flowmeter procedure, you install a flowmeter on a hydraulic service cart and read the flow from it.
(c)
To use the amp-clamp and multimeter procedure, you put the amp-clamp adapter around one of the wires connected to a relay for the EMDP. You then read the current on the multimeter (that is connected to the amp-clamp adapter) subtract the basic current and use Figure 603 to get the flow. One person can do this procedure from the Control Cabin.
(3)
When you read the ammeter, make a record of the value to the nearest
0.1 ampere. Use Figure 603 to change current to flow.
(4)
When you read the flowmeter, make a record of the value to the nearest 100 cc/minute.
B. References
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