PBN, RVSM, ACAS Flashcards
PBN
What is navigation specification?
A set of aircraft and aircrew requirements needed to support navigation within a defined airspace. It defines the performance required.
When performing PBN operations NOTAM should be checked for?
Availability of navaid facilities.
Predicted GNSS unavailability (SBAS/EGNOS)
If SBAS/EGNOS outage is confirmed via NOTAM, preflight RAIM predicion is required.
What is the cross track error/ deviation limitation normally allowed?
+/- 1/2 RNAV/RNP
+/- 1 RNAV/RNP brief deviations are allowed
What should crew notify ATC if there is a problem with PBN capability?
“Unable RNAV due equipment” together with proposed course of action.
Radar vectors, conventional approach or reverting to different minima, e.g. LPV to LNAV/VNAV.
What type of PBN approaches excist?
RNP APCH and RNP AR APCH.
What three types of minima can RNP APCH have?
LPV (DA 200’ +)
LNAV/VNAV (DA 250’+)
LNAV (MDA 250’ +)
What is special with RNP AR APCH?
It can range from simple straight in approach to complex curved approaches with RF legs used in the final and missed approach. Allows for reduces lateral and vertical obstacle clearance and requires special approval.
RNP AR APCH has LNAV/VNAV minima.
What are the lateral and vertical limitations for RNP approaches?
Lateral deviation should normally be limied to 1/2 x RNP value associated with the procedure up to 1 x RNP value briefly.
Vertical deviation should not exceed 75’ (LNAV/VNAV) or half scale deflection on LPV approach.
Where is list of allowed RNP AR approaches published?
OM-C Ch 12.2
Is RNP-AR approach allowed for alternate planning purposes?
No.
PBN
Considerations before approach
Required equipment is operational (MEL, QRH etc)
Check waypoint sequence
Speed and altitude restrictions, path angles
GNSS is used, deselect NAVAIDS if required
Set altimeters (max 100’ difference)
OAT within procedure limits
LNAV - CDFA, add 50’
RNP AR - TAWS TERRAIN must be displayed
Throughout RF legs max speeds should not be exceeded.
Route modification RNP
Can the lateral and vertical definition of the flightpath between FAF and MAP be changed by flight crew?
No
When can direct to be accepted to IF?
Provided that it is clear to the FC that the aircraft will be esablished on final approach track at least 2 NM before FAF.
Can direct to FAF be accepted?
No.
Can direct to a point preceeding a RF leg be accepted?
No
When should the crew execute a missed approach during RNP APCH (unless visual)?
Failure of navigation system, including those affecting lateral and vertical deviation performance (eg GNSS sensor, FD, AP)
Loss of signal (RAIM, SBAS alert or loss integrity funtion)
Flight instrument failure which affects the ability to safely complete the approach.
Navigation instruments show significant disagreement
The lateral/vertical devistions are exceeded (1 x RNP / +/- 75’ of he glide path or half scale when angular devistion is used)
What is the purpose of RVSM?
To increase airspace capacity.
Between which levels is RVSM applied?
Between FL290 and FL410.
What does ACAS stand for?
Airborna collision avoidance system
Within what time frame should crew respond to a first RA?
Within 5 seconds
Within what time frame should crew respond to a second (modified) RA?
2,5 seconds
When is TCAS inhibited?
When GPWS warning is activated
When aircraft performance is limited by configuration
Altitude to low for vertical maneuver
What kind of report should be completed after a TCAS RA?
A flight safety report.
