RNAV/RNP AR Flashcards
Use in conjunction with FLS Guidance deck.
What modes are required to fly an RNP AR approach?
APP-DES with NAV are the required modes for an RNP-AR approach.
Is it possible to do an RNP AR approach down to .1 nm with one FMC unserviceable?
No
2 FMCs give 0.3 NM capability
See FCOM table PRO-SPO-PBN 00021349.0001001
On an RNP AR approach, is the vertical guidance temperature compensated?
No, the profile does not compensate for low temperatures and so chart limits must be respected.
Temperature corrections should not be used.
What check is carried out on the flight plan for an RNP AR approach?
Check the RNP value for each leg of the RNAV(RNP) procedure.
If necessary, modify the RNP value in the FMS POSITION/MONITOR page.
What is the maximum allowable discrepancy between altimeters on an RNP AR approach?
75 ft
Is it permissable to hand fly an RNP AR approach?
Yes, as long as the RNP is .3 or above.
Approaches with an RNP of less than .3 require one autopilot to be engaged.
When cleared for an RNP AR approach how is the flight system armed?
Press the APPR pb when cleared for approach and prior to starting the RNP AR final approach.
What mode must arm when pressing the APPR button during an RNP AR approach?
APP-DES mode.
What condition must be met to get APP-DES mode on the FMA prior to flying an RNP AR approach?
The flight crew must have selected an RNAV(RNP) approach on the FMS ARRIVAL page.
When does APP-DES engage?
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.
How are the LDEV and VDEV scales selected for display?
APP-DES deviation scales appear automatically when flying an RNP-AR approach.
On the PFD deviation scales for an RNP-AR approach, what does one dot LDEV equal?
0.1 NM
A numerical value of LDEV is displayed on the ND after reaching what value of lateral deviation?
As soon as it exceeds 0.02 NM.
When is PM required to call ‘CROSS TRACK’?
The PM announces “CROSS TRACK” if excessive lateral deviation occurs: ½ RNP or 0.1 NM (whichever occurs first).
In the event that lateral deviation reaches the RNP, what is the mandated course of action?
Go-Around
What is being indicated if the LDEV flashes on the PFD and XTK pulses on the ND?
Lateral deviation has reached the current RNP value.
When does VDEV appear on the PFD?
VDEV automatically appears when flying a RNP AR procedure and when the FMS flight phase is DES or APPR.
What does one dot equal in VDEV?
One dot equals to a deviation of 100 ft.
When is the PM required to call ‘VDEV’?
The PM announces “VDEV” if excessive vertical deviation occurs: -50 ft or ½ dot below
When is a go-around required for excessive vertical deviation?
Go-around must be initiated if vertical deviation reaches -75 ft or ¾ dot below (after the FAF)
When does the VDEV flash on the PFD?
If vertical deviation reaches -75 ft or ¾ dot below.
What is the minimum height for use of the autopilot with APP-DES engaged?
200 ft.
What modes will the flight directors revert to after the Missed Approach Point?
HDG and V/S
What is the message displayed when ECAM senses a loss of RNP AR capability?
ECAM displays “RNP AR CAPABILITY DOWNGRADED”
What ECAM fault messages would require a go-around during an RNP AR approach with no visual reference?
- SURV TAWS FAULT or
- SURV SYS 1+2 FAULT or
- SURV TERR SYS FAULT or
- SURV GPWS FAULT
If an RNP AR approach is expected, how should the IRS be aligned before take-off?
A complete alignment of the IRS must be performed before takeoff.
How is the FMS flight plan checked before starting an RNP AR approach?
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.
How is the RNP AR capability checked before starting the procedure?
The RNP AR capability must be in accordance with the intended RNP AR procedure.
When is the use of a Ground Based Prediction Program for checking NAV PRIMARY recommended?
- 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 °).
How does an unserviceable GPWS system affect RNP AR capability?
RNP AR prohibited without EGPWS.
What is the importance of checking the Navigation Database before an RNP AR approach?
The Navigation Database must be current.
Where can the required approval be found to fly an RNP AR approach?
In the Loretto brief, including the minimum RNP for the specified approach.
Where can details of RAIM outages be found.
In the Loretto brief.
What role does FMC-C play during an RNP AR approach?
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.
If a go-around is carried out during an RNP AR approach, how is the lateral mode affected?
NAV mode remains engaged during a go-around.
What does this message mean on the ND?
Shown when the flight crew manually selects the RNP value in the POSITION/MONITOR page
What does this message mean on the ND?
Shown when the navigation database provides the RNP value.
What does this message mean on the ND?
Shown when the RNP value is the flight area RNP value.
Do RNP AR procedures always have their final approach legs as RNP AR?
NO.
An approach with xLS guidance may be associated with a RNP AR missed approach. The approach procedure name has then the suffix (RNP).
What is the maximum speed on an RF leg?
185 kts
