Systems Guide

A318/A319/A320/A321
Professional
SYSTEMS
Systems guide
Vol
4
04-03-57
11 July 2018
RADIO NAVIGATION
NAVIGATION RADIOS
The navigation radios are set in the MCDU on the RADIO NAV page. You enter this page by pressing the
RADNAV key. Tuning to a station is as simple as entering the frequency (like 117.50) or the name (like
SPA) on the scratchpad and then clicking the button next to the radio you want to tune. If there is more
than one station with the same name or frequency the nearest is always selected.
GPWS
The Ground Proximity Warning System (GPWS) generates audio and visual warnings when the aircraft is in
a dangerous condition;
• Mode 1: Excessive rate of descent
• Mode 2: Excessive ground closure rate
• Mode 3: Altitude loss after takeoff
• Mode 4: Unsafe terrain clearance
• Mode 5: Excessive deviation from glide path
Note that some airports have approaches that will trigger the GPWS warnings. Be prepared for this.
RUNWAY AWARENESS AND ADVISORY SYSTEM
The Runway Awareness and Advisory System (RAAS) is designed to provide to crews information about
the aircraft's position relative to an airport's runway while operating at an airport. RAAS is a software
upgrade to the later-model Enhanced Ground Proximity Warning Systems. It is designed to prevent
runway incursion incidents. The RAAS is automatically triggered and does not have any user interface. See
Vol1 for more information.
• Approaching Runway (on ground)
• Approaching Runway (in air)
• On Runway