PBN - RNP - RNP AR

Question 1

Difference between RNAV, RNP and RNP AR?

Answer 1

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

Question 2

PBN (Performance Based Navigation) scheme:

Answer 2

PBN is divided into 2 categories:

1. RNAV - Without Performance Monitoring & Alerting System
   
   • En-route (RNAV 10 & 5)
   • Terminal (RNAV 1 & 2)
2. RNP - WITH Performance Monitoring & Alerting System
   
   • En-route (RNP 4)
   • Terminal (RNP 1)
   • Approach /Departure (RNP & RNP AR) ‼️

Question 3

What type of altitude are RNP approached based on?

Answer 3

Barometric altitude

Question 4

How much represent one dot deviation in an RNAV app? And in a RNP app?

Answer 4

1 dot = 0.1NM

Question 5

What is the range of the lateral deviation (each side) for a RNP-RNAV NON PREC APP?

Answer 5

+/- 0.2 NM (each side)

FCOM (G-EJCI) Aircraft SYS - Ind & Reporting sys - PFD - Trajectory deviation

Question 6

RNAV (GNSS). When may the approach be continued? and when must it be discontinued?

Answer 6

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”.

Question 7

What is the appropriate “callout” when discontinuing an RNAV approach?

Answer 7

“Unable RNAV due to equipment, request re-clearance”

Question 8

RNP AR. When may the approach be continued? And when must it be discontinued?

Answer 8

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.

Question 9

What is the difference between RNAV and RNP?

Answer 9

RNP has Performance Monitoring and Alerting System.

Question 10

What is the difference between RNP and RNP-AR?

Answer 10

RNP-AR has RF legs along with RNP values </= 0.3

Question 11

Where on the aircraft is the Required Nav Accuracy Displayed?

Answer 11

PROG page.

Question 12

Which GPS feeds Position Information to the EGPWS/TAWS?

Answer 12

GPS 1

Question 13

How many satellites are required for Fault Detection and Exclusion?

Answer 13

6.

3 for position
1 for time
1 for altitude
1 for vertical profile

Question 14

Only the on-boars Predictive GPS check needs to be completed. True or False?

Answer 14

FALSE.

It doesn’t take into account terrain masking; a ground based check must be completed prior to any RNP-AR.

Question 15

RADIONAV’s should be deselected before every approach. True or False?

Answer 15

FALSE.

Only de-select RADIONAVs as indicated by CCI/NOTAM.

Question 16

What are the call-out trigger for an RNAV APP? (FINAL APP mode engaged).

Answer 16

> 0.1 X-TRK
1/2 dot ND (“V-DEV”)

And GO AROUND if:
>0.3 X-TRK
>3/4 dot below

Question 17

What are the call-out triggers for an RNP-AR APP? (FINAL APP must be engaged).

Answer 17

1/2 dot L/DEV
1/2 dot V/DEV

And GO AROUND if:
1 L/DEV
3/4 dot V/DEV

Question 18

Requirements (or steps) to follow on a RNP APP.

Answer 18

• Minima LNAV/VNAV
• NO FDs ⚠️
• FDP (Final Descent Point) as TO WYPT.
• Check CSTRs