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in the data base, possibly corrected by the takeoff shift entered on PERF TO page.
- In flight, the FM position approaches the radio position or the GPS position at a rate
depending upon the aircraft altitude.
FM POSITION
\
RADIO OR GPIRS
MIX IRS POSITION
Bias
Each FMGC computes a vector from its MIX IRS position to the radio or GPIRS position.
This vector is called the "bias".
Each FMGC updates its bias continuously if a radio position or a GPIRS position is available.
If an FMGC looses its radio/GPIRS position, it memorizes the bias and uses it to compute
the FM position, which equals the mix IRS position plus the bias.
Until the radio or the GPIRS position is restored, the bias does not change.
The crew can update the FM position manually. This also updates the bias.
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃ ┃ ┃1.22.20 P 6 ┃
┃ ┃ ┣━━━━━┳━━━━━┫
┃I ~-~ A318 ┃I FLIGHTLMANAGEMENT ┃SEQ 110 1 ┃I REV 26 ┃
┃ aw aw ,, ~L,~ A319 ┃ ┃ ┃ ┃
┃ Lli,~ A320 ┃ ┃ ┃ ┃
┃ A~7-~'M" A321 ┃ ┃ ┃ ┃
┃ FLIGHT CREW OPERATING MANUAL ┃ ┃ ┃ ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━━━┻━━━━━┻━━━━━┛
POSITION MONITOR
The crew may check the position computation using the "GPS MONITOR" or "POSITION
MONITOR" page.
TAKEOFF UPDATE
FM POSITION (ONSIDE FMGC)
FM POSITION (OFFSIDE FMGC)
GPIRS OR RADIO POSITION (ONSIDE FMGC)
WHICHEVER IS USED FOR POSITION UPDATING
MIX IRS POSITION (ONSIDE FMGC)
A takeoff update requires that the takeoff runway be part of the flight plan. This provides
the most accurate position update.
If the takeoff run starts at an intersection, enter a takeoff shift on the PERF TO page to refine
the takeoff update.
An accurate takeoff update ensures a precise aircraft position during departure.
PERF TO PAGE
INITIATED FROM RUNWAY
THRESHOLD, TO SHIFT
SHOULD BE INSERTED TO
UPDATE THE POSITION.
F-PLN A PAGE
(WITHOUT PREDICTIONS)
CCM ALL
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本文链接地址：
AIRBUS A320 Flight Crew Operating Manual1(173)
