PBN - RNP - RNP AR Flashcards
(20 cards)
Difference between RNAV, RNP and RNP AR?
RNAV and RNP are fundamentally similar. The key difference is the requirement for on-board performance monitoring and alerting.
The key difference between RNP and RNP AR is the addition of curved paths with RNP value <0.3
PBN (Performance Based Navigation) scheme:
PBN is divided into 2 categories:
- RNAV - Without Performance Monitoring & Alerting System
- En-route (RNAV 10 & 5)
- Terminal (RNAV 1 & 2)
- RNP - WITH Performance Monitoring & Alerting System
- En-route (RNP 4)
- Terminal (RNP 1)
- Approach /Departure (RNP & RNP AR) ‼️
What type of altitude are RNP approached based on?
Barometric altitude
How much represent one dot deviation in an RNAV app? And in a RNP app?
1 dot = 0.1NM
What is the range of the lateral deviation (each side) for a RNP-RNAV NON PREC APP?
+/- 0.2 NM (each side)
FCOM (G-EJCI) Aircraft SYS - Ind & Reporting sys - PFD - Trajectory deviation
RNAV (GNSS). When may the approach be continued? and when must it be discontinued?
MAY BE CONTINUED:
- MCDU msg “GPS PRIMARY LOST” on one.
- MCDU msg “NAV ACCUR DOWNGRAD” on one.
- Loss of both APS: Fly app manually WITH FDs.
MUST BE DISCONTINUED:
- MCDU msg “GPS PRIMARY LOST” on both.
- MCDU msg “NAV ACCUR DOWNGRAD” on both.
- ECAM CAUTION “NAV FM/GPS POS DISAGREE”.
What is the appropriate “callout” when discontinuing an RNAV approach?
“Unable RNAV due to equipment, request re-clearance”
RNP AR. When may the approach be continued? And when must it be discontinued?
MAY BE CONTINUED:
- MCDU msg “GPS PRIMARY LOST” on one.
- MCDU msg “NAV ACCUR DOWNGRAD” on one.
- Loss of both APS: Fly app manually WITH FDs. (Unless RNP <0.3)
- Loss of one MCDU.
- Loss of one FMGC.
- Loss of one EFIS DU.
MUST BE DISCONTINUED:
- MCDU msg “GPS PRIMARY LOST” on both.
- MCDU msg “NAV ACCUR DOWNGRAD” on both.
- ECAM CAUTION “NAV FM/GPS POS DISAGREE”.
- MCDU msg “FM1/FM2 POS DIFF”.
- Loss of both FMGC.
- Loss of both FINAL APP mode.
- Loss of both GPWS TERRAIN
- NAV ALT DISCREPANCY.
- Loss of L/DEV or X-TRK or V/DEV.
What is the difference between RNAV and RNP?
RNP has Performance Monitoring and Alerting System.
What is the difference between RNP and RNP-AR?
RNP-AR has RF legs along with RNP values </= 0.3
Where on the aircraft is the Required Nav Accuracy Displayed?
PROG page.
Which GPS feeds Position Information to the EGPWS/TAWS?
GPS 1
How many satellites are required for Fault Detection and Exclusion?
6.
3 for position
1 for time
1 for altitude
1 for vertical profile
Only the on-boars Predictive GPS check needs to be completed. True or False?
FALSE.
It doesn’t take into account terrain masking; a ground based check must be completed prior to any RNP-AR.
RADIONAV’s should be deselected before every approach. True or False?
FALSE.
Only de-select RADIONAVs as indicated by CCI/NOTAM.
What are the call-out trigger for an RNAV APP? (FINAL APP mode engaged).
> 0.1 X-TRK
1/2 dot ND (“V-DEV”)
And GO AROUND if:
>0.3 X-TRK
>3/4 dot below
What are the call-out triggers for an RNP-AR APP? (FINAL APP must be engaged).
1/2 dot LAT/DEV
1/2 dot V/DEV
And GO AROUND if:
1 LAT/DEV
3/4 dot V/DEV
Requirements (or steps) to follow on a RNP APP.
- Minima LNAV/VNAV
- NO FDs ⚠️
- FDP (Final Descent Point) as TO WYPT.
- Check CSTRs
RNP AR. Limits for GA LAT-DEV and V/DEV.
LAT DEV ➡️ 0.3 or more ➡️ GO AROUND
V/DEV ➡️ 3/4 or more ➡️ GO AROUND
How many satellites are required to perform an RNP AR APP and where do we find this information?
24 or more satellites are required. We can check this at AUGURRAIM app.
