ILS Approaches Flashcards
Cat 1 ILS approaches typically have what for DH and minimum visibility?
DH 200’
RVR 2400’ (1/2 mile)
In addition to horizontal guidance, what makes an ILS approach a precision approach?
Vertical guidance
Cat 2 and Cat 3 approaches require what?
Special ground and airborne equipment
Special pilot training and check ride
A localizer gives what type of guidance?
Horizontal guidance
A glide slope gives a pilot what type of guidance?
Vertical guidance
Where are localizer transmitters located?
Departure end of the runway
1000’ from runway end
What are the 2 modulating frequencies of the localizer beams?
150 Hz
90 Hz
How wide are the localizer beams at full scale CDI deflection as they cross the threshold of the runway?
350’ from either side of the runway
How sensitive is a localizer compared to a VOR?
4 times as sensitive
Where are glide slope transmitter located?
Offset near the landing end of the runway
What is a typical glide slope angle?
3 degrees
What is the glide slope false lobes descent angle?
12 degrees
What can a pilot do to avoid accidentally descending on the false lobes of the glide slope?
Always intercept the glide slope below the glide slope
How wide are the glide slope beams at full scale CDI deflection?
0.7 degrees
How far away from the transmitter can an aircraft expect to receive the glide slope beams?
10 nm
How far down the runway is a glide slope transmitter usually installed?
Transmitted from TDZ
Offset 750-1250’
Why are the ILS hold short lines farther away from a runway than the normal runway hold lines?
So you don’t block the glide slope beams
What radio does a pilot use to tune in both the localizer and glide slope transmitters?
Nav radio
Does a pilot need to listen to morse code and identify the localizer and glide slope transmitters?
Yes
One frequency tunes in both the localizer and the glide slope
All ILS morse code identifiers start with what letter?
I
Cat 1 ILS approaches usually have what 2 marker beacons?
Middle marker
Outer marker
Marker beacons give the pilot a reference of what type of information?
Reference to distance from the runway
What are the 2 types of indications a pilot will get when they fly over a marker beacon?
Lights
Tones in audio panel
Can a pilot use a middle marker beacon to actually decide that they are at the DA?
No
The outer marker beacon transmits what morse code sound and blinks what color light?
—- dashes
Blue
How far away from the runway are outer marker beacons usually located?
4-7 nm
Some ILS approaches use DME or VOR or LOM or ATC radar instead of having an outer marker T/F?
True
The middle marker beacon transmits what morse code and blinks what color light?
.-.-. Dots and dashes
Orange
Where are middle marker beacons usually located at a point where the aircraft is at what height above touchdown and at what distance from the runway?
200’ above touchdown zone
3500’ from runway threshold
Some ILS approaches use an LOM or ATC radar instead of having a middle marker T/F?
True
The inner marker beacon transmits what morse code sound and blinks what color light?
…. Dots
White
Inner marker beacons are used on what Cat of ILS approach?
Cat 2
Cat 3
A compass locator marker is really what type of transmitter?
Low powered NDB
