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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 ┃ ┃ ┃
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┃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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本文链接地址：
AIRBUS A320 Flight Crew Operating Manual1(174)
