RNAV/RNP AR

Question 1

What modes are required to fly an RNP AR approach?

Answer 1

APP-DES with NAV are the required modes for an RNP-AR approach.

Question 2

Is it possible to do an RNP AR approach down to .1 nm with one FMC unserviceable?

Answer 2

No

2 FMCs give 0.3 NM capability

See FCOM table PRO-SPO-PBN 00021349.0001001

Question 3

On an RNP AR approach, is the vertical guidance temperature compensated?

Answer 3

No, the profile does not compensate for low temperatures and so chart limits must be respected.

Temperature corrections should not be used.

Question 4

What check is carried out on the flight plan for an RNP AR approach?

Answer 4

Check the RNP value for each leg of the RNAV(RNP) procedure.

If necessary, modify the RNP value in the FMS POSITION/MONITOR page.

Question 5

What is the maximum allowable discrepancy between altimeters on an RNP AR approach?

Answer 5

75 ft

Question 6

Is it permissable to hand fly an RNP AR approach?

Answer 6

Yes, as long as the RNP is .3 or above.

Approaches with an RNP of less than .3 require one autopilot to be engaged.

Question 7

When cleared for an RNP AR approach how is the flight system armed?

Answer 7

Press the APPR pb when cleared for approach and prior to starting the RNP AR final approach.

Question 8

What mode must arm when pressing the APPR button during an RNP AR approach?

Answer 8

APP-DES mode.

Question 9

What condition must be met to get APP-DES mode on the FMA prior to flying an RNP AR approach?

Answer 9

The flight crew must have selected an RNAV(RNP) approach on the FMS ARRIVAL page.

Question 10

When does APP-DES engage?

Answer 10

APP-DES engages in the vertical capture zone around the flight plan path:

Between -50 ft and + 250 ft if the flight plan path is in level off, or

Between -250 ft and + 250 ft if the flight plan path is in descent.

Question 11

How are the LDEV and VDEV scales selected for display?

Answer 11

APP-DES deviation scales appear automatically when flying an RNP-AR approach.

Question 12

On the PFD deviation scales for an RNP-AR approach, what does one dot LDEV equal?

Answer 12

0.1 NM

Question 13

A numerical value of LDEV is displayed on the ND after reaching what value of lateral deviation?

Answer 13

As soon as it exceeds 0.02 NM.

Question 14

When is PM required to call ‘CROSS TRACK’?

Answer 14

The PM announces “CROSS TRACK” if excessive lateral deviation occurs: ½ RNP or 0.1 NM (whichever occurs first).

Question 15

In the event that lateral deviation reaches the RNP, what is the mandated course of action?

Answer 15

Go-Around

Question 16

What is being indicated if the LDEV flashes on the PFD and XTK pulses on the ND?

Answer 16

Lateral deviation has reached the current RNP value.

Question 17

When does VDEV appear on the PFD?

Answer 17

VDEV automatically appears when flying a RNP AR procedure and when the FMS flight phase is DES or APPR.

Question 18

What does one dot equal in VDEV?

Answer 18

One dot equals to a deviation of 100 ft.

Question 19

When is the PM required to call ‘VDEV’?

Answer 19

The PM announces “VDEV” if excessive vertical deviation occurs: -50 ft or ½ dot below

Question 20

When is a go-around required for excessive vertical deviation?

Answer 20

Go-around must be initiated if vertical deviation reaches -75 ft or ¾ dot below (after the FAF)

Question 21

When does the VDEV flash on the PFD?

Answer 21

If vertical deviation reaches -75 ft or ¾ dot below.

Question 22

What is the minimum height for use of the autopilot with APP-DES engaged?

Answer 22

200 ft.

Question 23

What modes will the flight directors revert to after the Missed Approach Point?

Answer 23

HDG and V/S

Question 24

What is the message displayed when ECAM senses a loss of RNP AR capability?

Answer 24

ECAM displays “RNP AR CAPABILITY DOWNGRADED”

Question 25

What ECAM fault messages would require a go-around during an RNP AR approach with no visual reference?

Answer 25

• SURV TAWS FAULT or
• SURV SYS 1+2 FAULT or
• SURV TERR SYS FAULT or
• SURV GPWS FAULT

Question 26

If an RNP AR approach is expected, how should the IRS be aligned before take-off?

Answer 26

A complete alignment of the IRS must be performed before takeoff.

Question 27

How is the FMS flight plan checked before starting an RNP AR approach?

Answer 27

Check that the FMS lateral and vertical F-PLN extracted from the navigation database is in agreement with the instrument procedure chart, particularly check that the correct RNP values are displayed on F-PLN page.

Question 28

How is the RNP AR capability checked before starting the procedure?

Answer 28

The RNP AR capability must be in accordance with the intended RNP AR procedure.

Question 29

When is the use of a Ground Based Prediction Program for checking NAV PRIMARY recommended?

Answer 29

• For RNP AR operations strictly below 0.15 NM and with less than 24 satellites available
• Within constrained environment areas. An environment area is considered constrained in the case of GPS masking in mountainous area (GPS mask angle > 5 °).

Question 30

How does an unserviceable GPWS system affect RNP AR capability?

Answer 30

RNP AR prohibited without EGPWS.

Question 31

What is the importance of checking the Navigation Database before an RNP AR approach?

Answer 31

The Navigation Database must be current.

Question 32

Where can the required approval be found to fly an RNP AR approach?

Answer 32

In the Loretto brief, including the minimum RNP for the specified approach.

Question 33

Where can details of RAIM outages be found.

Answer 33

In the Loretto brief.

Question 34

What role does FMC-C play during an RNP AR approach?

Answer 34

The two active FMCs (FMC-A and FMC-B) compute the LDEV and the VDEV. In addition, during RNP AR procedures, FMC-C also computes the LDEV, but keeps its role of backup FMC.

The two active FMCs (FMC-A and FMC-B) send to the FMC-C the next 20 legs of their flight plans. The FMC-C crosschecks the flight plans provided by the active FMCs, before the computation of the LDEV.

Note:

The flight crew cannot interact with FMC-C.

Question 35

If a go-around is carried out during an RNP AR approach, how is the lateral mode affected?

Answer 35

NAV mode remains engaged during a go-around.

Question 36

What does this message mean on the ND?

Answer 36

Shown when the flight crew manually selects the RNP value in the POSITION/MONITOR page

Question 37

What does this message mean on the ND?

Answer 37

Shown when the navigation database provides the RNP value.

Question 38

What does this message mean on the ND?

Answer 38

Shown when the RNP value is the flight area RNP value.

Question 39

Do RNP AR procedures always have their final approach legs as RNP AR?

Answer 39

NO.

An approach with xLS guidance may be associated with a RNP AR missed approach. The approach procedure name has then the suffix (RNP).

Question 40

What is the maximum speed on an RF leg?

Answer 40

185 kts