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A 737-300/400/500MAINTENANCE MANUAL
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27-11-00
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A
737-300/400/500MAINTENANCE MANUAL
AILERON AND AILERON TRIM CONTROL SYSTEM - MAINTENANCE PRACTICES
_______________________________________________________________
1. General_______
A. This procedure contains two tasks. The first task is the pressurization of hydraulic systems A and B. The second task is the removal of pressure from hydraulic systems A and B.
B. You must release the pressure from hydraulic systems A and B before you do maintenance on the aileron control system. This is to prevent injury to persons because of accidental operation of the control system. You must be careful to put maintenance stands and equipment away from control surface travel.
C. Electric pump 1 pressurizes hydraulic system B and electric pump 2 pressurizes hydraulic systems A. Electric pump 1 heat exchanger is installed in the fuel tank 2. Electric pump 2 heat exchanger is installed in fuel tank 1. When you operate the hydraulic pumps to pressurize the hydraulic systems, you must obey these steps:
(1)
Make sure not less than 250 gallons (1675 pounds/760 kilograms) of fuel is contained in each fuel tank 1 and 2. This is to absorb the heat from the hydraulic fluid. On hot days, or when you know the fuel temperature is above 90°F (32.2°C), monitor the systems overheat indicators. Turn pumps off when the hydraulic fluid becomes too hot.
D.
This procedure contains pressurization of hydraulic systems A and B with the operation of the electric hydraulic system A or B pumps. Pressurization of the hydraulic systems with the engine-driven hydraulic pumps is not given.
TASK 27-11-00-862-001
2. Aileron Hydraulic Systems A and B Pressurization________________________________________________
A. References
(1)
12-12-00/301, Hydraulic Servicing
(2)
24-22-00/201, Electrical Power
(3)
32-00-01/201, Ground Lock Assemblies
B.
Access
(1)
Location Zones
101 Control Cabin, LH
102 Control Cabin, RH
216 Main Wheel Well, LH
217 Main Wheel Well, RH
C.
Pressurize the Aileron Hydraulic Systems A and B
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A 737-300/400/500MAINTENANCE MANUAL
(LOOKING AFT)
B
Aileron Power Control Switches
Figure 201
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A 737-300/400/500MAINTENANCE MANUAL
SEE A
LOCK F80049-12
FLIGHT CONTROLS SHUTOFF VALVE
FLIGHT CONTROLS
HYDRAULIC MODULE MANUAL OVERRIDE LEVER (SHOWN AT POSITION 2)
A
Hydraulic Module Lock Installation Figure 202
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