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On the MCDU PROG page, the required and the estimated position accuracy are displayed, and
determine the HIGH/LOW accuracy indication (Refer to STLO-22_20_R-10 GENERAL).
The required accuracy can be a default value, which is either a function of the flight phase, or a
navigation database procedure value, or a value manually-entered by the crew.
When flying in an RNP environment, the crew can insert the appropriate RNP value in the
REQUIRED ACCUR field of the PROG page.
When HIGH is displayed
The RNP requirement is estimated to be fulfilled.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SPECIAL OPERATIONS
REQUIRED NAVIGATION PERFORMANCE (RNP)
A318/A319/A320/A321 FLEET PRO-SPO-51 P 3/10
FCOM 19 AUG 10
When LOW is displayed
The RNP requirement is estimated not to be fulfilled. In this case :
• The crew crosschecks navigation with raw data, if available,
• If the crosscheck is negative, or if raw data is unavailable, the crew informs the ATC.
When leaving the RNP environment, the crew will clear the manually-entered required accuracy.
WITHOUT GPS PRIMARY FUNCTION
RNP accuracy criteria are met, provided radio navaid coverage supports it for :
‐ RNP-1 en route and in the terminal area, provided a required accuracy of 1 nm See (1) is
checked, or manually entered in the MCDU.
‐ RNP-0.3 in approach, provided a required accuracy of 0.3 nm See (1) is checked, or manually
entered in the MCDU.
Note: (1) It is possible to enter the radial equivalent to the specified Crosstrack (XTK) accuracy,
that is the RNP multiplied by 1.2, the EPE being an estimated radial position error.
WITH THE GPS PRIMARY FUNCTION
RNP requirements are met, provided GPS PRIMARY is available, for :
‐ RNP-1 en route
‐ RNP-0.5 in the terminal areas, provided the AP or FD in NAV mode is used.
‐ RNP-0.3 in approach, provided the AP or FD in NAV mode is used.
BRNAV IN EUROPEAN AIRSPACE
Applicable to:
In this airspace, radio navaid coverage is assumed to support RNP-5 accuracy.
The minimum required equipment to enter BRNAV airspace is :
‐ One RNAV system, which means :
• One FMGC
• One MCDU
• One VOR or one GPS receiver for FM navigation update
• One DME or one GPS receiver for FM navigation update
• One IRS
‐ Flight Plan Data on two NDs.
PROCEDURES
When GPS PRIMARY is not available, periodically crosscheck the FM position with navaid raw
data.
Manual selection of a required accuracy on the MCDU is optional.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SPECIAL OPERATIONS
REQUIRED NAVIGATION PERFORMANCE (RNP)
A318/A319/A320/A321 FLEET PRO-SPO-51 P 4/10
FCOM 19 AUG 10
If manual entry of a required accuracy is desired enter 5 nm or use the radial equivalent to
5 nm XTK accuracy, that is 6.1 nm.
When leaving RNP-5 airspace, or when entering the terminal area revert to the default
required accuracy, or enter the appropriate value on the MCDU.
If one of the following MCDU or ECAM messages is displayed
check navigation accuracy with navaid raw data, or with the GPS MONITOR page (if GPS
installed) :
• NAV ACCUR DOWNGRAD
• FMS1/FMS2 POS DIFF
• CHECK A/C POSITION
• ECAM : FM/GPS POS DISAGREE (if GPS installed)
If the accuracy check confirms that RNP-5 capability is lost, or if both FMGCs have
failed Inform the ATC, and revert to conventional navigation.
If the accuracy check confirms that only one FMGC position is incorrect , resume
navigation with the other FMGC.
In inertial navigation, BRNAV capability is maintained for 2 h, independently of the estimated
accuracy displayed on the MCDU.
BRNAV IN EUROPEAN AIRSPACE
Applicable to:
,
,
MSN,,,,
In this airspace, radio navaid coverage is assumed to support RNP-5 accuracy.
The minimum required equipment to enter BRNAV airspace is :
‐ One RNAV system, which means :
• One FMGC
• One MCDU
• One VOR or one GPS receiver for FM navigation update
• One DME or one GPS receiver for FM navigation update
• One IRS
‐ Flight Plan Data on two NDs.
PROCEDURES
When GPS PRIMARY is not available, periodically crosscheck the FM position with navaid raw
data.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SPECIAL OPERATIONS
REQUIRED NAVIGATION PERFORMANCE (RNP)
A318/A319/A320/A321 FLEET PRO-SPO-51 P 5/10
FCOM 19 AUG 10
Manual selection of a required accuracy on the MCDU is optional.
If manual entry of a required accuracy is desired enter 5 nm or use the radial equivalent to
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A320机组操作手册FLIGHT CREW OPERATING MANUAL 14(41)
