EGPWS System and Operation A320

EGPWS
Enhanced GPWS provides all normal aural GPWS functions as well as the
enhanced terrain avoidance features.
The enhanced function is database
(computer) driven but it is shown in a radar format. Please note that the radar is
NOT being used for terrain detection but the DISPLAY will override the weather
radar image display when the terrain on ND pb (TERR ON ND) is selected. If the
TERR ON ND pb is not selected and a warning is generated the terrain display
will come on automatically and override weather radar display. The Terrain
“sweep” is a distinctive middle to the sides to make it obviously different from the
normal radar. The enhanced terrain feature can be shut off using the TERR pb
on the overhead without losing any of the normal GPWS functions.

Standby Nav, remote tuning

When normal radio navigation is not available you can use the backup nav
mode, Standby Nav (STBY NAV), also known as remote tuning. Select Rose
VOR for the ND. Press the guarded NAV button on the RMP and the green light
will come on indicating that you are now using Standby Nav. To use VOR nav
press the VOR button. Then tune the VOR frequency with the normal selector
knob in the STBY/CRS window. Press to transfer the freq to active and now you
can select the course on the STBY/CRS window using the inner knob of the
selector. All autotuning is disabled during Standby Nav. Number 1 VOR will be
displayed on Capts. ND in Rose VOR. Number 2 VOR will be displayed on F/O’s
ND in Rose VOR.

To tune an ILS first select Rose LS on the ND. Then press the LS button on the
FCU. Then press the guarded NAV button on the RMP. Then press the LS
button in the STBY NAV area of the RMP. Now tune the ILS frequency by using
the normal RMP selector to tune the freq. in the STBY/CRS window. Then press
the transfer button to make the frequency active. Now you can select the ILS
course using the inner knob of the selector. Number 1 ILS will be displayed on
Capt”s. PFD when in LS and F/O’s ND when on Rose LS. Number 2 ILS will be
displayed on F/O’s PFD when on LS and Capt’s. PFD when on Rose LS

Note: the ILS STBY NAV will display onside tuning on the PFD and offside tuning
on the ND. This allows comparison of the signals during approach.

Note: If the STBY NAV is being used during the electrical emergency
configuration only RMP 1 has power.

RADNAV Nav, manual tuning: Select the RADNAV key on the MCDU. Enter the
VOR ident on LSK 1R or 1L and the course on LSK 2R or 2L. Select VOR Rose
for the ND. To manually tune an ILS use the same technique by putting the ILS
ident on LSK 3L and ILS course on 4L then select ILS Rose for the ND. Press
the LS pb to see DME on PFD.
Note: when ROSE VOR is selected with a VOR manually tuned the CAPT ND
will show VOR1 and F/O ND will show VOR2. However, when ROSE LS is
selected with an ILS manually selected the CAPT ND will show ILS2 and the F/O
ND will show ILS1.

Communications: Comms are monitored by ECAM for “stuck mike”.
All RMP’s will tune any radio. ACP’s may be switched in case of failure using
Audio Switching panel on overhead.

Other Links

Automatic Direction Finder ADF

Autopilot Components

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