(b)
The pressure which is shown is related to the ground source you use.
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A
737-300/400/500MAINTENANCE MANUAL
TASK 36-05-00-862-010
3. Use the APU to Pressurize the Pneumatic System
______________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 49-11-00/201, APU Power Plant
B. Access
(1) Location Zone
101/102 Control Cabin
C. Pressurize the Pneumatic System
S 862-011
CAUTION: YOU MUST SUPPLY THE ELECTRICAL POWER BEFORE YOU SUPPLY THE
_______ PNEUMATIC POWER. IF YOU DO NOT SUPPLY THE ELECTRICAL POWER FIRST, YOU CAN CAUSE DAMAGE TO THE COMPONENTS OF THE AIR CONDITIONING SYSTEM.
(1) Supply the electrical power (AMM 24-22-00/201).
S 862-030
WARNING: YOU MUST ISOLATE THESE SYSTEMS BEFORE YOU PRESSURIZE THE
_______
PNEUMATIC SYSTEM:
-
THE AIR CONDITIONING SYSTEM
-
THE ENGINE START SYSTEM
-
THE COWL AND WING ANTI-ICE DUCTS
-
THE HYDRAULIC RESERVOIR
-
THE POTABLE WATER TANKS.
IF YOU DO NOT ISOLATE THESE SYSTEMS, THEY CAN OPERATE AND THE PNEUMATIC SYSTEM CAN LOSE PRESSURE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(2) Start the APU (AMM 49-11-00/201).
(a) Let the APU become stable at the governed speed.
S 862-034
(3)
Put the APU BLEED switch, on the forward overhead panel, to the ON position (Fig. 201).
(a) The APU load control and the bleed air valve will open to permit the pneumatic system to pressurize.
(4)
Put the ISOLATION VALVE to the OPEN position (Fig. 201).
S 862-013
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737-300/400/500MAINTENANCE MANUAL
S 212-026
(5) Monitor the two indicators for the duct pressure on the forward overhead panel.
(a) The indicators must show 30 to 50 psi on each pointer without the systems in operation.
TASK 36-05-00-862-014
4. Operate One or More of the Engines to Pressurize the Pneumatic System
_____________________________________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 49-11-00/201, APU Power Plant
(3)
AMM 71-00-00/201, Power Plant
(4)
AMM 75-24-02/201, High Pressure Turbine Clearance Control System
B. Procedure
S 862-015
CAUTION: YOU MUST SUPPLY THE ELECTRICAL POWER BEFORE YOU SUPPLY THE
_______ PNEUMATIC POWER. IF YOU DO NOT SUPPLY THE ELECTRICAL POWER FIRST, YOU CAN CAUSE DAMAGE TO THE COMPONENTS OF THE AIR CONDITIONING SYSTEM.
(1) Supply the electrical power (AMM 24-22-00/201).
S 862-031
WARNING: YOU MUST ISOLATE THESE SYSTEMS BEFORE YOU PRESSURIZE THE
_______
PNEUMATIC SYSTEM:
-
THE AIR CONDITIONING SYSTEM
-
THE ENGINE START SYSTEM
-
THE COWL AND WING ANTI-ICE DUCTS
-
THE HYDRAULIC RESERVOIR
-
THE POTABLE WATER TANKS.
IF YOU DO NOT ISOLATE THESE SYSTEMS, THEY CAN OPERATE AND THE PNEUMATIC SYSTEM CAN LOSE PRESSURE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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