Airbus A340 Series, Brochure

Page: 146 / 211

STL 472.502/90 Issue 6
A340 Automatic Flight System - Flight Management
10.26
Radio navigation
Each FMGC tunes its own side radio navaids, except
when in single operation :
- One VOR, one ILS, one ADF (if belonging to the F-
PLN) and five DMEs may be autotuned at the
same time.
- Manual tuning always has priority over autotuning.
- Autotune priority rules are according to FMGS
logic ;
For example :
• VOR autotune (frequency course) priority is :
- Manual tune,
- Specified navaid for approach,
- Radio position computation,
- Display purpose logic.
• Five DMEs can be scanned simultaneously
- One DME for display purposes ;
- Two DMEs for radio position computation
when in DME/DME mode ;
- One DME for VOR/DME position comput-
ation when in VOR/DME mode ;
- One DME is linked to ILS/DME.
Radio navigation architecture
FMGC 2 FMGC 1
FMGC 1 FMGC 2
RMP 1 RMP 2
VOR 1
DME 1
ILS 1
ADF 1
VOR 2
DME 2
ILS 2
ADF 2
RADIO NAV
VOR 1 FREQ
SIU / 128.50
CRS
075
ILS / FREQ
( ) / ( )
ADFI / FREQ
10E / 415.00
415.00 / 10E
FREQ/ ADF 2
FREQ/ VOR 2
CRS
( )
115.70 /TGO
CRS
( )