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737-27-1253
These are the indications for the standby hydraulic system:
* Low quantity
* Low pressure
* Stby Rud On.
GUN ALL
Hydraulic Pressure Indication
Hydraulic pressure shows on the lower center display unit
systems display for systems A and B.
Hydraulic Fluid Quantity Indication
Hydraulic fluid quantity shows in percent of full, on the lower
center display unit systems display for systems A and B
reservoirs.
The LOW QUANTITY amber light to the right of the FLT
CONTROL switches on the flight control panel comes on when
the hydraulic fluid quantity decreases to less than normal in the
standby hydraulic system reservoir.
Hydraulic Pump Low Pressure Warning Indication
The amber LOW PRESSURE lights come on for each pump
when the output pressure is less than normal.
The hydraulic systems A and B LOW PRESSURE lights are
above the HYD PUMP control switches on the hydraulic panel.
The standby system LOW PRESSURE light is to the right of the
FLT CONTROL switches on the flight control panel.
Hydraulic Fluid Overheat Warning Indication
The amber OVERHEAT lights for the hydraulic system A and B
EMDPs come on when the pump case drain hydraulic fluid
temperature is more than normal. These lights are above each
HYD PUMP control switch on the hydraulic panel.
HYDRAULIC POWER - CONTROL AND INDICATIONS
EFFECTIVITY
GUN ALL 29-00-00
Page 9
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-00-00-005
The amber OVERHEAT lights for the hydraulic system A and B
EMDPs also come on when the EMDP electric motor
temperature is more than normal. The electric motor
temperature sensor is independent of the case drain
temperature sensor.
The standby hydraulic system does not have an overheat
indicator.
Master Caution Indication
When any of the amber lights on the hydraulic control panel
come on, the MASTER CAUTION light and the HYD light on the
system annunciator panel (P7) also come on.
When any of the amber lights on the flight control panel come
on, the MASTER CAUTION light and FLT CONT light on the
system annunciator panel (P7) also come on.
HYDRAULIC POWER - CONTROL AND INDICATIONS
EFFECTIVITY
GUN ALL 29-00-00
Page 10
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-00-00-005
HYDRAULIC POWER - CONTROL AND INDICATIONS
HYDRAULIC POWER - CONTROL AND INDICATIONS
EFFECTIVITY
GUN 001-005, 201-999 PRE SB 737-27-1253 29-00-00
Page 11
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-00-00-005
HYDRAULIC POWER - CONTROL AND INDICATIONS
HYDRAULIC POWER - CONTROL AND INDICATIONS
EFFECTIVITY
GUN 006-099, 101-115; GUN 001-005, 201-999 POST SB 737-27-1253 29-00-00
Page 12
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
29-00-00-005
General
The components for the main, auxiliary, and ground servicing
hydraulic systems are in these locations:
* Engine accessory gearbox
* Main landing gear wheel well
* Main fuel tanks
* Aft wing-to-body fairing.
Main Hydraulic Systems
Hydraulic system A, and system B components are almost the
same. System A components are on the left side of the airplane.
System B components are on the right side of the airplane.
These are the components on the engines:
* The system A engine-driven pump (EDP) and case drain
filter module are on the left engine
* The system B engine-driven pump (EDP) and case drain filer
are on the right engine.
These are the components in the main landing gear wheel well:
* Reservoir (2)
* Engine driven-pump (EDP) supply shutoff valve (2)
* Electric motor-driven pump (EMDP) (2)
* Pressure module (2)
* EMDP Case drain filter module (2)
* Return filter module (2).
These are the components in the main fuel tanks:
* System A heat exchanger in main fuel tank 1
* System B heat exchanger in main fuel tank 2.
These are the components in the ram air bays:
* System A ground service disconnect module in the left ram
air bay
* System B ground service disconnect module in the right ram
air bay.
Standby Hydraulic System
These are the components in the main landing gear wheel well:
　
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