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┃J  ~-Z A318                     ┃     AUTO FLIGHT  ┃1.22.20     P 7       ┃
┃  aw aw ,, ~L,~ A319            ┃                  ┃                      ┃
┃                                ┃                  ┣━━━━━┳━━━━━┫
┃ Lli,~ A320                     ┃                  ┃SEQ 110 J ┃J REV 28  ┃
┃      A~7-~'M" A321             ┃FLIGHT MANAGEMENT ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                  ┃          ┃          ┃
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NAVIGATION MODES
The FMGS updates the FM position using GPS or radio navaids if the GPS function in
inoperative.
It can use 4 main different FM navigation modes to make this update. The decreasing
priority order is:
-IRS-GPS
-IRS-DME/DME
-IRS-VOR/DME
- IRS only
During ILS approaches the system performs, a lateral temporary updating using one of the
following modes :
-IRS-GPS/LOC
-IRS-DME/DME-LOC
-IRS-VOR/DME-LOC
-IRS-LOC
EVALUATION OF POSITION ACCURACY
The FMGS computes an Estimated Position Error (EPE) continually.
It is an estimate of how much the FM position has drifted, and is a function of the
navigation mode the system is using.
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┃CURRENT     ┃EPE                             ┃REMARK                              ┃
┃NAV         ┃(RATE or THRESHOLD)             ┃                                    ┃
┃MODE        ┃                                ┃                                    ┃
┣━━━━━━╋━━━━━━━━━━━━━━━━╋━━━━━━━━━━━━━━━━━━┫
┃IRS/GPS     ┃q-(FOM2 + 1002) in meters       ┃FOM = Figure of Merit of GPS        ┃
┃            ┃                                ┃If above 0.28 NM the GPS position   ┃
┃            ┃                                ┃is rejected.                        ┃
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual1(174)