PBN Flashcards
What is PDE?
Path Definition Error
Defined path may not exactly match the desired path, caused by the resolution of the computer and irregular Earth’s surface. This is a smal error managed ni the data chain,
What is NSE?
Navigation Sensor Error
ACs’ actual position may not coincide with its estimated position, minimised by using more accurate pos’ sensors. Represents the difference between the true pos’ and estimated pos’.
What is FTE?
Flight Technical Error
Ability of pilot or avionics to fly from estimated position onto the defined path. Can be minimised by use of flight director or autopilot.
What is TSE?
Total System Error
The combination of al 3 above errors.
The TSE of AC and the desired path difference between physical true position of AC and the desired path.
When an AC has demonstrated that all eros combined, the AC is able to fly within the required performance 95% of the flight time with lateral track accuracy of +-/ 1nm or better.
What is LNAV/VNAV?
Lateral and Vertical guidance
from the estimated position onto the defined path is
called LNAV, VNAV respectively.
What is a Waypoint?
Awaypoint is defined as a geographic coordinate (in WGS84) and is identified either:
- By a 5 letter unique name code, e.g. XILAN
- If located with a ground based NAVAID by the 3 letter ICAO identifier for that station e.g. TEB
-For Terminal Airspace only, by an alphanumeric name code, e.g. SA541.
What is a FRT?
Fixed Radius Transition
An enroute functionality.
FRT are used for other ATS routes, usually at higher altitudes.
This functionality has recommended turn radial
• 22.5NM for airways above FL20
• 15NM for airways below FL.19
What is aPath Terminator?
Instrument Flight Procedures each ‘leg’ is associated with a ‘Path Terminator’, which defines how the path wil be flown and how the ‘leg’ wil be terminated.
RF (Radius to Fix), used for consistent turn performance on IFPs, is one example of a path terminator. With RF the ‘leg’ is to be flown as a fixed radius around a defined arc centre and
terminating at the next fix (which is a waypoint).
What is a Fly-by turn?
The aircraft’s RNAV system anticipates the turn. The turn starts at some distance before the waypointot alow tangential interception of the next leg of the ATS route or procedure.
The majority of aircraft capable of area navigation have this functionality.
The earliest the
turn
can be initiated
is 20M prior to
the waypoint.
What is a Flyover turn?
The aircraft starts to turn onto the next leg of the ATS route as to passes over
the waypoint.
Al aircraft capable of area navigation can perform a
flyover turn.
Causes aircraft to overfly route which may conflict with parallel routes/aircraft
What is Parallel Offset?
(ref. RNAV)
/
Aparallel track ot the left or right of the designated or established airway/route. Normaly associated with
RNAV.
Only
used during the en-route phase and can be used to achieve lateral separation or to avoid wake turbulence etc. as an alternative to radar vectoring etc.
