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December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
13.20.6 D6-30151-425
Hydraulics -
System Description
Intentionally
Blank
April 1, 2000
747 Operations Manual
Hydraulics Chapter 13
EICAS Messages Section 30
Copyright © The Boeing Company. See title page for details.
D6-30151-425 13.30.1
Hydraulics EICAS Messages
The following EICAS messages can be displayed.
Message Level Aural Condition
HYD CONTROL
1, 4
Advisory Hydraulic control module inoperative;
demand pump automatic switching and/or
hydraulic systems may not be available.
HYD OVHT SYS
1, 2, 3, 4
Advisory Hydraulic fluid temperature excessive.
Message Level Aural Condition
HYD PRESS DEM
1, 2, 3, 4
Advisory Demand pump selector OFF, or demand
pump commanded to run and demand
pump output pressure low, or system 4
demand pump selector is inAUX.
Inhibited by HYD PRESS SYS message in
a system low pressure condition.
Message Level Aural Condition
HYD PRESS ENG
1, 2, 3, 4
Advisory Engine drive pump output pressure low.
Inhibited by HYD PRESS SYS message in
a system low pressure condition.
HYD PRESS SYS
1, 2, 3, 4
Caution Beeper Hydraulic system pressure low.
Message Level Aural Condition
>HYD QTY LOW
1, 2, 3, 4
Advisory Hydraulic system fluid quantity low.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
13.30.2 D6-30151-425
Hydraulics -
EICAS Messages
Intentionally
Blank
April 1, 2000
747 Operations Manual
Landing Gear Chapter 14
Table of Contents Section 0
Copyright © The Boeing Company. See title page for details.
D6-30151-425 14.TOC.0.1
Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.1
Landing Gear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.1
Nose Wheel Steering Tiller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.2
Brake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.3
Rudder/Brake Pedals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.3
Autobrakes Selector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.3
Parking Brake Lever . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.4
Brake Accumulator Pressure Indicator . . . . . . . . . . . . . . . . . 14.10.5
Landing Gear SystemIndications. . . . . . . . . . . . . . . . . . . . . . . . 14.10.6
Landing Gear Position Indications . . . . . . . . . . . . . . . . . . . . 14.10.6
Gear Synoptic Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.8
SystemDescription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.1
Air/Ground Sensing System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.1
Landing Gear Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.1
Landing Gear Retraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.2
Landing Gear Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.2
Landing Gear Alternate Extension . . . . . . . . . . . . . . . . . . . . 14.20.2
NoseWheel and Body Gear Steering . . . . . . . . . . . . . . . . . . . . . 14.20.3
Brake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.3
Normal Brake Hydraulic System. . . . . . . . . . . . . . . . . . . . . . 14.20.3
Alternate Brake Hydraulic System . . . . . . . . . . . . . . . . . . . . 14.20.3
Brake Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.3
Antiskid Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.3
Brake Torque Limiter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.4
Autobrake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.4
Parking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.5
Brake Temperature Indication . . . . . . . . . . . . . . . . . . . . . . . . 14.20.6
Normal Brake System Diagram. . . . . . . . . . . . . . . . . . . . . . . 14.20.7
Alternate Brake SystemDiagram . . . . . . . . . . . . . . . . . . . . . 14.20.8
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
　
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