What is XTK?
Cross Track Error
It is a measure of how accurately the approach is being flown.
Prog page 4
What do ANP and RNP stand for?
Actual Navigation Performance
Required Navigation Performance
What do we do with LNAV minima?
Add 40 feet. MDA
What do we do with LNAV/VNAV minima?
No correction. DA
What is the RNP up to the FAF?
1nm
What is the required RNP from FAF to MAP?
0.3nm (progress page 4 enter or verify)
What is RNP after MAP?
1nm
If ANP exceeds RNP what happens?
FMC alert
‘Unable required NAV performance -RNP
Max XTK error on approach?
0.5nm
Max XTK error from FAF to MAP?
0.15nm
What are the rules re routing to FAF?
- no direct routings to FAF
- direct routings to IF allowed providing
- do not add remove waypoints to RNAV procedure
What is APV?
Approach Procedure Vertical Guidance
LNAV + VNAV
Must use non precision calls
For a non precision we may use which vertical mode?
VNAV or VS
What are some TEM considerations with RNAV?
It is a Baro VNAV System so it has the following limitations
- QNH Blunder Error
- Temperature Error, changes true altitude.
- warmer air, true altitude higher
- colder air, true altitude lower, Cold Temp Correction made
What does temperature on APV chart signify?
If temperature is lower than this then the LNAV/VNAV minima must not be used.
LNAV minima (MDA) can be used and corrections made.
At the FAF both pilot altimeters must be within how much?
+- 100ft
Prog Page 4 Vertical Deviation max allowed is?
+- 75ft
What messages require a go around?
- unable required NAV perf RNP
- FMC DISAGREE
- verify position
- failure both FMC’s
- Loss AFDS LNAV
- GPS L/R invalid
- IRS Pos Disagree
- Unable procedure airspace
What should be checked at the 500 continue/go around call?
- XTK 0.15
- Vertical +- 75ft (3 whites 3 reds)
- landing Configuration
- v/s as required (greater than 1000 must be previously briefed)
What procedure do we have at Ryanair to try to avoid CFIT?
- Loadsheet QNH from printed weather
- ATIS or ATC QNH on arrival
If any difference or confusion confirm with ATC
Some helpful guidelines
- 1000ft call shud be around 4 miles
- 2500 call
Ryanair up is approved for?
RNAV(GNSS) or RNAV(GPS) approaches to LNAV minima
RNAV(GNSS) or RNAV(GPS) approaches to LNAV/VNAV minima
Ryanair is not approved for?
RNAV(GNSS) or RNAV(GPS) approaches to LPV minima
RNAV(RNP) approaches
APV (Approach with vertical guidance) is flown to?
LNAV/VNAV minima
NPA (non precision approach) is flown to?
LNAV minima (+40 feet)
