Chapter 16: Final Approach Flashcards
When does final begin for a precision vs non-precision approach?
Precision: glideslope intercept
Non-precision: FAF (maltese cross on plate)
What is the VDP?
Visual descent point. It is a point from which a stabilized descent can be made from MDA to runway touchdown point. They are not a mandatory part of the procedure.
What should you do if flying to higher mins than what is published or no VDP is published?
Calculate your own. If no VDP is published, be cautious as an obstacle may be a factor for a descent to the runway.
How do you calculate the VDP?
“Gus wears a hat”. HAT/GS * 100
When should continuous descent final approach (CDFA) be flown?
When practicable, especially in ICAO. EU it is required or else approach weather mins will be higher.
How do you calculate a CDFA?
Go to the table in the Legend where compare groundspeed to descent angle for desired VVI/descent rate. Then find altitude to lose from FAF altitude - (TCH+TDZE/THRE). Then divide that by the descent gradient you found to find the “FAF” for the CDFA, NM from runway to start the descent on that descent gradient/VVI down to the MDA.
Do not go below the MDA even when executing a missed approach. Use padding with a calculated altitude 50’ above MDA as a guide for when to start going missed so don’t go below MDA.
How much can st-in course be off the runway and still be considered a st-in?
30 deg
Do not descend below 100’ above TDZE using approach lights as a reference unless what?
Have the red side row bars or red terminating bars visible and identifiable
When must you use timing on an approach?
Only when DME is gone or have no other way to ID MAP but timing. It’s a backup.
When do you need a vector back to final or must discontinue the approach on a LOC/ILS?
If exceed full scale deflection (outside 2 dots). Can request a vector back to intercept from ATC if prior to FAF/gs intercept
When flying a LOC BC (backcourse) what course should you set in?
The published front course (this is the smaller number associated with the feather).
When flying an ILS, when must you switch to LOC mins?
If aircraft is more than one dot below or two dots above the glideslope. If reintercept the glideslope prior to MDA can continue down to ILS mins.
