Systems Guide

A318/A319/A320/A321
Professional
SYSTEMS
Systems guide
Vol
4
04-03-60
11 July 2018
MANUAL MODE
The engines are in manual mode when the thrust levers are outside the operating range and the ATS is
not activated. In manual mode the pilot operates the engines by moving the thrust levers between idle
and T.O./G.A. The FADEC will calculate the optimal N1 rating for each position.
When on ground and the thrust levers are in the FLEX detent the FADEC will select a thrust rating based
on flex T.O temperature (set in MCDU) greater than the current TAT. If no flex temperature is set MCT
thrust will be used. MAX TO power is always available by pushing the levers full forward.
AUTOMATIC MODE
In autothrust mode (A/THR activated) the thrust is calculated by the FMGC but limited to the mode
setting of the thrust levers. When an alpha-floor condition is detected the FMCG will automatically select
alpha-floor mode and full power is available.
The FMA will flash white LVR CLB to remind the pilot to select climb mode above the thrust reduction
altitude.
RADIO NAVIGATION
Radio Navaids are used to display positional information and by the aircraft computer to calculate it’s
position. Tuning can be done automatically by the FMGC or manually using the MCDU RADNAV or PROG
pages. When the FMGC fails the Radio Management Panel can be used. Manual tuning always has
priority.
NAVAID SELECTION ON MCDU PAGES
The navaids that are tuned by the FMGC can be seen on three MCDU pages:
• RADIO NAV page
Tuning can here be done by entering the frequency or name.
The nearest navaid that matches will be used.
• PROG page
• SELECTED NAVAIDS page
AUTOTUNE VOR
The following priority rules are used for VOR tuning:
• Approach navaid
• Radio position computation
• Navaid specifically for the active leg
AUTOTUNE ADF/DME
The following priority rules are used for DME and ADF tuning:
• ADF in F-PLN and/or fix in the approach is a TO waypoint
• Radio position computation