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The system displays the EPE to the crew and compares it with the required navigation
performance (RNP).
- If the EPE does not exceed the appropriate criteria, accuracy is HIGH.
- If the EPE exceeds the appropriate criteria, accuracy is LOW.
The required navigation performance is displayed on the PROG page. These figures are
defaulted value and can be modified by the crew.
When the message "SYSTEM RNP IS XX.X" is displayed, the crew should verify the
manually entered RNP value in the REQUIRED field of the PROG page and clear or modify
it if necessary.
The RNP value shall be in accordance with the specified RNP values of the
navigation/approach charts (if a RNP is specified).
This message is also displayed at change of flight area if the new required criteria
(defaulted value) is smaller than the displayed manually entered value.
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃POSITION ACCURACY CRITERIA defined by airworthiness authorities ┃
┣━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┫
┃ ┃REQUIRED NAVIGATION ┃
┃FLIGHT AREA ┃ ┃
┃ ┃PERFORMANCE (RNP) ┃
┣━━━━━━╋━━━━━━━━━━━━━━━━━━━━━━━━━┫
┃EN ROUTE ┃3.41 NM ┃
┣━━━━━━╋━━━━━━━━━━━━━━━━━━━━━━━━━┫
┃TERMINAL ┃2.07 NM ┃
┣━━━━━━╋━━━━━━━━━━━━━━━━━━━━━━━━━┫
┃ ┃ VOR/DME 0.61 NM ┃
┃APPROACH ┃ ┃
┃ ┃OTHER CASES 0.36 NM ┃
┗━━━━━━┻━━━━━━━━━━━━━━━━━━━━━━━━━┛
When the position computation uses IRS/GPS mode, the EPE is always smaller than any
airworthiness required value. As a result, accuracy is HIGH and GPS is the primary mean
of navigation. "GPS PRIMARY" is displayed on PROG page and temporarily on ND.
EFIS ND
┏━━━━━━━━━━━━━━━━━━━━━━━━┳━━┓
┃ DES AF024 ┃ ┃
┃ CRZ OPT REC MAX ┃ ┃
┃ FL350 FL390 ┃EEl ┃
┃ VDEV=+ 39OFT ┃F~ ┃
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本文链接地址：
AIRBUS A320 Flight Crew Operating Manual1(176)
