Instrument Landing Systems

What are the two main components of an ILS?

• Localizer and Glide Slope

• Vertical Speed Indicator and Heading Indicator

• Navigation Display and Flight Management System

• Air Speed Indicator and Altimeter

How does the localizer function in an ILS?

• The localizer is used to measure wind speed during landing.

• The localizer provides lateral guidance to align the aircraft with the runway centerline.

• The localizer provides vertical guidance for altitude control.

• The localizer helps in calculating fuel efficiency during flight.

What frequency range is typically used for ILS signals?

• 100.00 to 105.00 MHz

• 108.00 to 111.95 MHz and 329.15 to 335.40 MHz

• 300.00 to 310.00 MHz

• 120.00 to 125.00 MHz

What is the difference between precision and non-precision approaches?

• Precision approaches rely solely on subjective opinions.

• Non-precision approaches provide more detailed data than precision approaches.

• Precision approaches are always faster than non-precision approaches.

• Precision approaches are approaches which provide both Horizontal and Vertical Guidance

On an ILS approach, the marker beacon lights indicate:

• The aircraft’s deviation from the glide path.

• The aircraft’s deviation from the centerline.

• The distance from the runway threshold.

• The height above ground at Decision Altitude.

In ILS terminology, what does the term “Decision Altitude” mean?

• The altitude at which the aircraft must land

• The altitude where the pilot must decide to continue or go around

• The altitude of the ILS localizer antenna

• The altitude where glide slope intercept occurs

What is the standard glide path angle provided by ILS?

• 2.5 degrees

• 3 degrees

• 3.5 degrees

• 4 degrees

Calculate the descent rate for an ILS glide slope angle of 3° at a groundspeed of 120 knots.

• 500 feet per minute

• 600 feet per minute

• 700 feet per minute

• 800 feet per minute

If you receive equal 90 Hz and 150 Hz modulation signals on the Localizer, it means:

• The aircraft is left of the runway centerline.

• The aircraft is right of the runway centerline.

• The aircraft is on the runway centerline.

• The Localizer signal is unreliable.

How does the Localizer provide lateral guidance to the aircraft?

• By using two overlapping lobes modulated at 90 Hz and 150 Hz

• By broadcasting a single omnidirectional signal

• By transmitting signals from multiple antennas along the runway

• By using a fixed frequency beam with no modulation