(2)  
Put the elevator hydraulic systems A and B back to the condition before the pressure removal.

 (3)  
Pressurize the elevator hydraulic systems A and B.

 (4)  
Put the elevator hydraulic systems A and B back to the condition before the pressurization.

 (5)  
A null procedure of the mach trim actuator.

 (6)  
A visual inspection of the Elevator Control Pushrod.

 (7)  
A visual inspection of the Elevator Feel and Centering Unit.

 B.  
The electrical pump 1 pressurizes the hydraulic system B and the electrical pump 2 pressurizes the hydraulic system A. When you operate the pumps to pressurize the hydraulic systems, you must obey these steps:

 (1)  
Make sure there are more than 250 gallons (1675 pounds/760 kilograms) of fuel in fuel tank 1 or 2. When the fuel temperature is more than 90°F (32.2°C), monitor the system B overheat indicator and turn the pumps off when the hydraulic fluid becomes too hot.

 C.  
This procedure contains pressurization of hydraulic systems A and B by the operation of the electrical pumps.

 TASK 27-31-00-862-001
 2.  Remove the Pressure from Elevator Hydraulic Systems A and B___________________________________________________________
 A.  Special Tools and Equipment
 (1)  
F80049 - Flight Controls Lock Assembly

 B.  
References

 (1)  
29-09-00/201, Hydraulic Reservoir Pressurization System

 C.  
Access

 (1)  
Location Zones
 101/102 Control Cabin
 216 Main Wheel Well, LH
 217 Main Wheel Well, RH

 D.  
Procedure

 S 862-002
 (1)  Set the FLT CONTROL A and B switches on the P5 Pilots' Overhead Panel to OFF.
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A
737-300/400/500MAINTENANCE MANUAL
 S 862-003
 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6-2 Circuit Breaker Panel 1) SHUTOFF VALVES - FLT CONT (2 locations)

 S 862-004
 (3)  
Set the HYD PUMPS A - ELEC 2 or the HYD PUMPS B - ELEC 1 switch on the P5 Pilots' Overhead Panel to OFF.

 S 862-005

 (4)  
Operate the rudder pedals to decrease the remaining hydraulic system pressure.

 S 862-006

 (5)  
If you will remove the hydraulic connections, do this task to remove the air pressure from the hydraulic systems A and B reservoirs: "Release the Pressure from the Hydraulic Reservoirs" (AMM 29-09-00/201).

 S 492-023

 (6)  
Install the flight control lock assemblies (which is referred to as the "lock assembly") (Fig. 202):

 (a)  
Disconnect the electrical connector D818 from the flight controls system A shutoff valve (which is referred to as the "shutoff valve A").

 (b)  
Disconnect the electrical connector D820 from the flight controls system B shutoff valve (which is referred to as the "shutoff valve B").

 (c)  
Make sure that the manual override lever at the shutoff valves A and B is in position 2 (OFF position).

 (d)  
Install a lock assembly on each shutoff valve. 1) Install the lockpins.

 TASK 27-31-00-842-024
 3.  Put the Elevator Hydraulic Systems A and B Back to the Condition Before_______________________________________________________________________ the Pressure Removal____________________
 A.  Special Tools and Equipment
 (1)  F80049 - Flight Controls Lock Assembly
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