.  
illuminates the STBY RUD ON, Master Caution, and Flight Controls (FLT CONT) lights.

Copyright . The Boeing Company. See title page for details.
Hydraulics -System Description

Standby Hydraulic System Schematic
YA613 -YC413

Copyright . The Boeing Company. See title page for details.
13.20.6  June 1, 2005

Hydraulics -System Description 737 Flight Crew Operations Manual
YD651 -YK104
LOW QUANTITY 
LOW PRESSURE 
STBY RUD ON 

Copyright . The Boeing Company. See title page for details.
March 28, 2005  13.20.7
Hydraulics -System Description 737 Flight Crew Operations Manual

Standby Hydraulic System Leak
If a leak occurs in the standby system, the standby reservoir quantity decreases to zero. The LOW QUANTITY light illuminates when the standby reservoir is approximately half empty. System B continues to operate normally, however, the system B reservoir fluid level indication decreases and stabilizes at approximately 72% full.
Variations in Hydraulic Quantity Indications
During normal operations, variations in hydraulic quantity indications occur when:
.
the system becomes pressurized after engine start

.
raising or lowering the landing gear or leading edge devices

.
cold soaking occurs during long periods of cruise. These variations have little effect on systems operation.

If the hydraulic system is not properly pressurized, foaming can occur at higher altitudes. Foaming can be recognized by pressure fluctuations and the blinking of the related LOW PRESSURE lights. The MASTER CAUTION and HYD annunciator lights may also illuminate momentarily.
Copyright . The Boeing Company. See title page for details.
13.20.8  September 26, 2003

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.1
Landing Gear Panel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.1 Landing Gear Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.2 Manual Gear Extension  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.3 Autobrake and Antiskid Controls . . . . . . . . . . . . . . . . . . . . . . . 14.10.4 Parking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.5 Hydraulic Brake Pressure Indicator . . . . . . . . . . . . . . . . . . . . . . 14.10.6 Brake Temperature Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.6 Rudder/Brake Pedals  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.7 Nose Wheel Steering Switch  . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.8 Nose Wheel Steering Wheel  . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.10.8
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.1
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.1 Landing Gear Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.1 Landing Gear Retraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.1 Landing Gear Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.2 Landing Gear Manual Extension  . . . . . . . . . . . . . . . . . . . . . 14.20.2 Nose Wheel Steering  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.3 Brake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.3 Normal Brake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.3 Alternate Brake System  . . . . . . . . . .. . . . . . . . . . . . . . . . . . 14.20.3 Brake Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.3 Antiskid Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.4 Autobrake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.4 Parking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.6 Air/Ground System  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.20.6 Air/Ground System Logic Table . . . . . . . . . . . . . . . . . . . . . . 14.20.6
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Landing Gear -Table of Contents 737 Flight Crew Operations Manual

Intentionally
Blank

Copyright . The Boeing Company. See title page for details.
14.TOC.0.2  September 29, 2005

Landing Gear Panel

 NOSE GEAR 
 
NOSE GEAR 
LEFT GEAR  RIGHT GEAR 
LEFT GEAR  RIGHT GEAR 

Landing Gear Indicator Lights (top)
Illuminated (red) –
.  
landing gear is not down and locked (with either or both forward thrust levers retarded to idle, and below 800 feet AGL).
　
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