Original subtitles

The GPWS monitors the aircraft flight path and generates visual

and audio warnings alerts when the aircraft is in one of the

defined hazardous situations.

These warnings will be overridden by stall or wind

shear warnings.

The Ground Proximity Warning System processes the data from

RA18 years, one ILS, one FMGC, 1L, GCI U1.

Most G PWS alerts and warnings are generated as a result of

changes in radar altimeter heights or the rates of those

changes.

The system predicts potential hazards from these trends, but

it has no forward-looking capability.

The GPWS control panel is located on the left side of the

overhead panel.

GPWS visual warnings are provided on the miscellaneous

panels.

The system can be tested by pressing either Ground Proximity

Warning system, Glide slope, push button switch.

This test is normally performed by the maintenance crew.

In addition, two loud speakers located on each lower side of

the main panel broadcast GPWS oral warnings even if they are

turned off.

If a high rate of descent is detected at low level, GPWS will

generate a repeated oral sync rate.

Sync rate Alert If this rate is or becomes excessive, a

repetitive oral warning whoop, whoop pull up, whoop, whoop,

pull up will be generated.

In both cases, the red GPWS light will illuminate.

If rising ground is detected as a potential threat to the safety

of the aircraft, GPWS will alert the crew with a repeated Terrain

Terrain Oral alert.

The system will then generate a woop woop pull up warning after

the terrain alert has been repeated twice.

In both cases, the red GPWS light will illuminate.

If the GPWS system detects a rate of descent during the

initial climb, after takeoff, or during a go around, it will

produce a repeated Don't Sink command along with the GPWS red

lights.

If the gear is retracted or the flap's not in the landing

configuration and GPWS detects that the aircraft is close to

the ground, too low terrain warning is generated and the red

GPWS lights eliminate.

If the aircraft continues to descend, another warning too low

gear is generated.

Again, the red GPWS lights eliminate.

If the gear is down but the flaps are not in the landing

configuration, the warning too low flaps is generated along

with the GPWS red lights.

As with other aircraft, the gear warning has priority over the

flap warning.

Below 1000 feet on approach, a GPWS glide slope, ARL and visual

alert will be generated.

If the runway is ILS equipped, the ILS is tuned.

The ILS signal is valid.

The aircraft is significantly below the glide slope.

Both amber glide slope lights will illuminate glide slope,

glide slope, glide slope.

The RO glide slope warning will become louder if no corrective

action is taken or if the aircraft descends even further

below the glide slope.

Flat 3 is a recognized landing configuration.

If the option is used, or if required by an ECAM procedure,

the crew must select Landing Flap 3 Switch ON to ensure that

the GPWS does not generate warnings when it detects that

the aircraft is not in the normal full flap configuration.

The associated green GPWS Flat 3 memo message is displayed on the

engine warning display.

Following certain failures, a landing may have to be made with

an even further reduced flap setting.

The crew can select the Flap Mode push button switch off to

inhibit GPWS flap warnings.

If the flap mode is off, the green Flap Mode OFF message is

displayed on the Engine warning display.

When selected off, the Glide Slope mode push button switch

will inhibit the GPWS glide slope warning.

The white off light illuminates when the GPWS is selected off.

All warnings are inhibited.

If your aircraft is equipped with the enhanced GPWS e.g.

PWSA forward-looking capability for terrain is added.

The basic GPWS functions remain unchanged.

e.g.

PWS is based on terrain database and FMGC current position, not

on radar returns.

The purpose of the enhanced GPWS is to avoid a controlled flight

into terrain and to give enough time to the crew to perform an

avoidance maneuver.

The Enhanced GPWS uses a terrain database coupled with an FMGS

position to calculate 2 terrain envelopes ahead of the aircraft.

When a conflict is detected between these terrain envelopes

and the terrain memorized in the database, an alert is triggered.

1 terrain envelope corresponds to a caution level, while the

second one corresponds to a warning level.

Two terrain on navigation display switches are installed

on each side of the center instrument panel for each ND.

To display terrain, the terrain on ND switch must be on.

Be aware that whether radar information is replaced by

terrain information even if the radar is switched on in the

lights out position, the enhanced GPWS operation is fully

automatic.

If the terrain switch is off, the enhanced functions are

inhibited, but basic GPWS functions are still operative.

If the enhanced functions fail, the fault light will eliminate,

but the basic GPWS functions remain operative.

For the basic GPWS, the system switch controls the basic

functions.

Should the Terrain ON ND function not be selected on when

a caution or warning is triggered, the terrain display

will automatically turn on and the ON light on the terrain

switch will illuminate.

The second enhanced GPWS protective function provides a

terrain clearance floor envelope for each runway stored in the

database.

This function warns against a premature descent below this

floor regardless of aircraft configuration caution.

The relative height is calculated using the captain's

barometric setting.

Thus, the system does not protect against Barrow setting

errors.

The position is calculated using FMGC One.

The system does not protect against FMGC One position

errors.

Should NAV accuracy become downgraded, the enhanced

functions of the enhanced GPWS are automatically deselected.

They will remain so until high NAV accuracy is restored.

The basic GPWS functions remain operative.