737 Flight Crew Operations Manual
Warning Systems Chapter 15
System Description Section 20
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D6-27370-866-EGP 15.20.1
20 System DescriptionSystem DescriptionFile High light
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 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 this section and 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.
YK981 - YQ456
Many of the flight instrument display symbols and annunciations listed in this
chapter also appear on the Head-Up Display (HUD) System. Refer to Chapter 10,
Flight Instruments, for HUD display symbol descriptions.
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 engine, wheel well, cargo, or APU 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.
September 15, 2016
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