.  
amber – terrain elevation is between 500 ft below and 2000 ft above
airplane altitude

.
red – terrain elevation is more than 2000 ft above airplane altitude.

Note:  Values displayed are applicable to terrain that is generally ahead of the airplane flight path. Terrain near the left and right margins of the display may not be included in the calculations.
Transponder Panel (TCAS)

Transponder Switch
TEST – the ATC FAIL light illuminates to indicate the selected transponder is
operational.
STBY – disables transponder modes.

Note:  Transponder modes are enabled only when the airplane is airborne, except for mode S, which operates continuously when the transponder mode selector is out of STBY.
ALT OFF – transponder operates without altitude reporting.
ALT ON – transponder operates with altitude reporting.
TA – enables display of traffic advisory TCAS targets.
TA/RA – enables display of traffic advisory and resolution advisory TCAS targets.

Air Traffic Control (ATC) Code Selector
Rotate – sets transponder code.
Copyright . The Boeing Company. See title page for details.
15.10.12   August 1, 2003

Warning Systems -Controls and Indicators 737 Operations Manual

As installed
AFT ELECTRONIC PANEL

Altitude Source Selector
1 – enables altitude reporting from ADC No. 1. 2 – enables altitude reporting from ADC No. 2.

Transponder Mode Selector
STBY – disables transponder modes.
Note:  Transponder modes are enabled only when the airplane is airborne, except for mode S, which operates continuously when the transponder mode selector is out of STBY.
ALT RPTG OFF – transponder operates without altitude reporting.
XPNDR – transponder operates with altitude reporting.
TA ONLY – enables display of traffic advisory TCAS targets.
TA/RA – enables display of traffic advisory and resolution advisory TCAS targets.
Warning Systems -Controls and Indicators 737 Operations Manual

Intentionally
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Copyright . The Boeing Company. See title page for details.
15.10.14  August 1, 2003

737 Operations Manual

Introduction
Aural, tactile and visual warning signals alert the flight crew to conditions
requiring action or caution in the operation of the airplane. The character of the
signals varies, depending upon the degree of urgency or types of hazards involved.
Aural, tactile, and visual signals are used singularly or in combination to
simultaneously provide both warnings and information regarding the nature of the
condition.

Mach/airspeed warnings, landing gear warnings, takeoff configuration warnings,
windshear warnings, and ground proximity warnings are discussed in this section.
Cabin altitude warning is discussed in the Air Systems chapter, and autopilot and
autothrottle disconnect warnings are discussed in the Automatic Flight chapter.
The conditions which excite the fire warning bell are discussed in the Fire
Protection chapter.

Conditions which require the immediate attention of the flight crew are indicated
by red warning lights located in the area of the pilots’ primary field of vision.
These lights indicate APU, cargo (as installed), engine, or wheel well fires;
autopilot, autothrottle disconnects; and landing gear unsafe conditions.

Conditions which require the timely attention of the flight crew are indicated by
amber caution lights.

Blue lights inform the flight crew of electrical power availability, valve position,
equipment status, and flight attendant or ground communications. Blue lights are
for information and do not require immediate flight crew attention. Some system
blue lights indicate a transitional state by illuminating bright as valves or
components reposition, then returning to a dim blue when the required
configuration is reached.

Green lights indicate a fully extended configuration, e.g., landing gear and leading

edge devices.
For specific information regarding red, amber, blue, and green lights refer to the
appropriate systems chapters.

Stall warning is provided by a control column shaker on each control column.
Various aural signals call attention to warnings and cautions. An aural warning for
airspeed limits is given by a clacker, the autopilot disconnect by a warning tone,
cabin altitude by an intermittent horn, and landing gear positions by a steady horn.
The takeoff configuration is given by an intermittent horn, and the fire warning by
a fire warning bell. Ground proximity warnings and alerts--as well as windshear
　
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