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algorithm that uses the following as inputs : The pressure altitude, GPS altitude, radio altitude, and
data from the terrain database.
The cockpit loudspeakers broadcast, even if turned off, the aural warning or caution messages
associated with each mode. The audio volume of these messages is not controlled by the
loudspeaker volume knobs. (These knobs only allow volume adjustment for radio communication).
PULL UP lights come on to give a visual indication when a PULL UP warning alert is triggered for
Modes 1, 2, and TAD.
GPWS lights come on for caution alerts of Modes 1 to 5, TAD and TCF, on the Captain and First
Officer instrument panels.
Note: A number of airports throughout the world have approaches or departures that are not
entirely compatible with standard GPWS operation. These airports are identified in the
envelope modulation database in such a way that when the GPWS recognizes such an
airport, it modifies the profile to avoid nuisance warnings.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - DESCRIPTION
A330/A340 FLEET DSC-34-70-10 P 3/4
FCOM 19 AUG 10
SCHEMATIC
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - DESCRIPTION
Intentionally left blank
A330/A340 FLEET DSC-34-70-10 P 4/4
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 1/10
FCOM 19 AUG 10
MODE 1 : EXCESSIVE RATE OF DESCENT
Applicable to: ALL
Mode 1 has two boundaries. Penetration of the first boundary causes the GPWS lights to come on,
and generates a repeated “SINK RATE” aural alert. Penetration of the second boundary generates a
repetitive “PULL UP” aural alert, and causes the PULL UP light to come on.
The lower cut-off limit is 10 ft radio altitude.
The upper cut-off limit is 2 450 ft radio altitude.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 2/10
FCOM 19 AUG 10
MODE 2 : EXCESSIVE TERRAIN CLOSURE RATE
Applicable to:
(*) The upper cut-off limit varies from 1 650 ft to 2 450 ft radio altitude, depending on the speed
(between 220 kt to 310 kt).
At certain airports, the upper boundary is limited to reduce the warning sensitivity and minimize
the nuisance warnings.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 3/10
FCOM 19 AUG 10
(2A) FLAPS NOT IN LANDING CONFIGURATION AND AIRCRAFT NOT ON THE GLIDE
SLOPE
BEAM.
Penetration of the boundary causes the GPWS lights to come on, and generates the repeated
aural alert : “TERRAIN”.
After “TERRAIN” has sounded twice, the warning switches to “PULL UP”, and is continually
repeated until the aircraft leaves the warning envelope. In addition, the PULL UP lights come
on. After the aircraft leaves the boundary, the GPWS lights replace the PULL UP ones and the
“TERRAIN” aural message persists.These alerts stop, when the aircraft increases either the
barometric or inertial altitude by 300 ft. If it enters another alert region during this altitude-gain
time, then the whole process begins again with a new reference altitude for the 300 ft altitude-gain.
(2B) THE FLAPS ARE IN LANDING CONFIGURATION.
Lowering the flaps to the landing position automatically switches GPWS to Mode 2B. In this case
lower boundary varies between 200 ft to 600 ft depending on altitude rate. In ILS approach (glide
slope deviation < ± 2 dots) the lower boundary is fixed at 30 ft.
When the aircraft enters the envelope, the alert is the same as for mode 2A. When gear and flaps
are in the landing configuration, the aural message is “TERRAIN ” only and is not followed by
“PULL UP” if the aircraft remains within the envelope.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 4/10
FCOM 19 AUG 10
MODE 2 : EXCESSIVE TERRAIN CLOSURE RATE
Applicable to: ,
(*) The upper cut-off limit varies from 1 650 ft to 2 450 ft radio altitude, depending on the speed
(between 220 kt to 310 kt).
At certain airports, the upper boundary is limited to reduce the warning sensitivity and minimize
the nuisance warnings.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 5/10
　
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