RNP Flashcards
What is the required equipment for RNP?
What can be MEL’d?
EGPWS set on terrain
• (2) FMS
- (2) GNSS receivers
- (2) Flight Director
- (1) Autopilot
- Dual functioning FMS. WASS enabled and working.
- 2 PFDs
- 2 ADCs
- 2 FDs
- 2 GPS Antennae
- Autopilot
- TAWS/EGPWS
- PMs MFD
- Current database
You can’t do an RNP approach if any of these items are MEL’d
Why do you have to inhibit VOR/DME on the FMS prior to an RNP approach?
How do you do it?
How do you know if they are successfully inhibited?
Because VOR/DME is a higher priority over gps when it comes to updating position.
1) Data pg2
2) Select DME
3) Select LSK next to DESEL DME
4) Select RETURN
5) Select VOR
6) Select LSK next to DESEL VOR
7) Select RETURN
8) Repeat for other FMS
(D) should show next to VOR and DME inputs.
When are you required to execute a missed approach on an RNP approach?
- Failure of required equipment. (NAV DR, NAV INTEG, POS, GPS INTEG advisories).
- Loss or degradation of NAV capabilities.
- Exceeding tolerances (1/2 scale deflection of LNAV or VNAV i.e. 75 ft).
- Outside of stabilized approach criteria.
- Exceeding speed restrictions.
- Aircraft malfunction.
- Windshear
- EGPWS caution (if EGPWS warning then terrain recovery procedure).
Loss of RNP on approach. (Loss of one or both FMSs)
One FMS: use the other.
Both FMSs: Dead reckon or alternate means i.e. NDB, VOR, radar vectors etc.
If an IRU loses DME inputs, what will happen and for how long?
It will enter coasting mode for 2 mins and 23 seconds.
What are the only altitudes to temp comp on an RNP approach?
DA and MSA
Ref: 3.17 (cold weather corrections) pg3-96
How does the FMS calculate position during an RNP approach?
It uses GNSS and IRU.
Ref: Sim and Training Guide 6.6.2.6
What is the difference from a GPS INTEG, a NAV INTEG or a NAV DR message?
What must we do to account for the differences in these messages especially during a go around?
With a GPS INTEG message, the IRU is still working and you have guidance for a few minutes. You must reenable VOR and DME inputs however you can’t do another RNP approach.
With NAV INTEG or NAV DR the FMS will not have sufficient performance to navigate accurately. Therefore “set heading, alt sel, check missed approach altitude”. Ask for radar vectors. However in a mountainous region you will have to dead reckon until you climb to a minimum vectoring altitude.
Ref: Sim Training Guide 6.6.2.6
Can you do an RNP after an engine failure?
No, because you need a functioning autopilot and Flight director which becomes unavailable below 1000ft agl.
If you don’t see APPR next to the HSI upon crossing the FAF, and the runway is not in sight?
Go Around
Sim study guide 6.6.2.4
