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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.
The new enhanced operational upper limit is reduced to 1 250 ft and to 789 ft in final approach,
when the enhanced functions and the geometric altitude are of high integrity.
(2B) FLAPS 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.
MODE 3 : ALTITUDE LOSS AFTER TAKEOFF
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 6/10
FCOM 19 AUG 10
If the aircraft descends during the initial takeoff climb or during a go-around, GPWS lights come on
and the “DON’T SINK” aural alert sounds repeatedly.
The lower cut-off limit is 30 ft radio altitude.
Mode 3 is desensitized according to the time accumulated after departure and the radio altitude.
MODE 4 : UNSAFE TERRAIN CLEARANCE WHEN NOT IN LANDING CONFIGURATION
Applicable to:
4A - LANDING GEAR UP
Two aural warnings may be triggered, depending on the area : “TOO LOW-GEAR” or “TOO
LOW-TERRAIN”. In addition, the GPWS lights come on.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 7/10
FCOM 19 AUG 10
4B - LANDING GEAR DOWN, AND FLAPS NOT IN LANDING CONFIGURATION.
Three aural warnings may be generated, depending on the area and the configuration :
“TOO LOW-GEAR”, “TOO LOW-FLAPS” or “TOO LOW-TERRAIN”. In addition, the GPWS lights
come on.
4 C – LANDING GEAR UP, OR FLAPS NOT IN LANDING CONFIGURATION.
If the aircraft starts an inadvertent controlled flight into the ground during takeoff and climb, and
penetrates the boundary, then the GPWS lights come on and the “TOO LOW TERRAIN” aural
alert sounds repeatedly.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 8/10
FCOM 19 AUG 10
MODE 4 : UNSAFE TERRAIN CLEARANCE WHEN NOT IN LANDING CONFIGURATION
Applicable to: ,
4A - LANDING GEAR UP
Two aural warnings may be triggered, depending on the area : “TOO LOW-GEAR” or “TOO
LOW-TERRAIN”. In addition, the GPWS lights come on.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 9/10
FCOM 19 AUG 10
4B - LANDING GEAR DOWN, AND FLAPS NOT IN LANDING CONFIGURATION.
Three aural warnings may be generated, depending on the area and the configuration :
“TOO LOW-GEAR”, “TOO LOW-FLAPS” or “TOO LOW-TERRAIN”. In addition, the GPWS lights
come on.
If the enhanced GPWS functions and the geometric altitude are of high integrity, the upper
operational limit is reduced to 500 ft. If not, it is only reduced to 800 ft, when an overflight is
detected.
4 C – LANDING GEAR UP, OR FLAPS NOT IN LANDING CONFIGURATION.
If the aircraft starts an inadvertent controlled flight into the ground during takeoff and climb, and
penetrates the boundary, then the GPWS lights come on and the “TOO LOW TERRAIN” aural
alert sounds repeatedly.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
NAVIGATION
GPWS - GPWS BASIC MODES
A330/A340 FLEET DSC-34-70-20 P 10/10
　
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