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┃ aw aw ,, ~L,~ A319 ┃ ┃ ┃
┃ ┃ ┣━━━━━┳━━━━━┫
┃ Lli,~ A320 ┃ ┃SEQ 110 J ┃J REV 34 ┃
┃ A~;-~'M" A321 ┃FLIGHT MANAGEMENT ┃ ┃ ┃
┃ FLIGHT CREW OPERATING MANUAL ┃ ┃ ┃ ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━━┻━━━━━┻━━━━━┛
GPS POSITION
Each IRS computes a hybrid position that is a mixed IRS/GPS position called GPIRS. For
this, each IRS can independently select their GPS source in order to maximize GPS data
availability. Among these 3 GPIRS positions received by each FMGC, one is selected
according to a figure of merit and priority. The selection is performed using the following
hierarchy :
- Onside GPIRS position
- GPIRS 3
- Opposite GPIRS position
If the GPIRS data does not comply with an integrity criteria, the GPS mode is rejected, and
radio position updating is used, the "GPS PRIMARY LOST" message is displayed on the ND
and on the MCDU scratchpad.
During non ILS approach, the loss of the GPS primary function triggers a triple click aural
warning.
When the GPS primary function is recovered, the "GPS PRIMARY" message comes up on
the ND and on the MCDU scratchpad. It means that GPIRS data again complies with the
required integrity criteria.
As long as GPS primary is in use, all usual navigation performance requirements are met.
The crew can deselect/select the GPS on the SELECTED NAVAIDS page, if necessary.
Fq
rYq
r~q
E3
DESELECT
SELECTED NAVAIDS
VOR/TAC AUTO DESELECT
<FGT 115.7o c ~
VOR/TAC AUTO
<FGT
VOR/TAC AUTO
<0DI
ILS/DME AUTO
<IGDI
DESELECT
~GPS
<RETURN
nformation concerning the GPS position is displayed on the GPS MONITOR page
GPS MONITOR
GPS1 POSITION
43~40.4N/O00~17.6E
TTRK GPS ALT GS
342.3 10000 310
MERIT MODE/SAT
lOOM NAV/6
GPS2 POSITION
43~40.4N/O00~17.6E
TTRK GPS ALT GS
342.3 10000 310
MERIT MODE/SAT
100M NAV/6
R Note ~ In normal operations, all ADIRUs may elect the same GPS source. As a result, data
R of the non-elected GPS may be dashed on the GPS MONITOR page, without any
R detected GPS failure or triggered "GPS PRIMARY LOST" message.
CCM ALL
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本文链接地址：
AIRBUS A320 Flight Crew Operating Manual1(170)
