Key Topic 70: Instrument Landing System (ILS) Flashcards
3-70K1: What is the frequency range of the localizer beam system used by aircraft to find the centerline of a runway during an Instrument Landing System (ILS) approach to an airport?
A. 108.10 kHz to 111.95 kHz.
B. 329.15 MHz to 335.00 MHz.
C. 329.15 kHz to 335.00 kHz.
D. 108.10 MHz to 111.95 MHz.
D. 108.10 MHz to 111.95 MHz.
3-70K2: What is the frequency range of the marker beacon system used to indicate an aircraft’s position during an Instrument Landing System (ILS) approach to an airport’s runway?
A. The outer, middle, and inner marker beacons’ UHF frequencies are unique for each ILS equipped airport to provide unambiguous frequency-protected reception areas in the 329.15 to 335.00 MHz range.
B. The outer marker beacon’s carrier frequency is 400 MHz, the middle marker beacon’s carrier frequency is 1300 MHz, and the inner marker beacon’s carrier frequency is 3000 MHz.
C. The outer, the middle, and the inner marker beacon’s carrier frequencies are all 75 MHz but the marker beacons are 95% tone-modulated at 400 Hz (outer), 1300 Hz (middle), and 3000 Hz (inner).
D. The outer marker beacon’s carrier frequency is 3000 kHz, the middle marker beacon’s carrier frequency is 1300 kHz, and the inner marker beacon’s carrier frequency is 400 kHz.
C. The outer, the middle, and the inner marker beacon’s carrier frequencies are all 75 MHz but the marker beacons are 95% tone-modulated at 400 Hz (outer), 1300 Hz (middle), and 3000 Hz (inner).
3-70K3: Which of the following is a required component of an Instrument Landing system (ILS) glideslope installation?
A. Altimeter: shows aircraft height above sea-level
B. Localizer: shows aircraft deviation horizontally from center of runway.
C. VHF Communications: provide communications to aircraft.
D. distance Measuring Equipment: shows aircraft distance to VORTAC station.
B. Localizer: shows aircraft deviation horizontally from center of runway.
3-70K4: What type of antenna is used in an aircraft’s Instrument Landing System (ILS) glideslope installation?
A. A vertically polarized antenna that radiates an omnidirectional antenna pattern.
B. A balanced loop reception antenna.
C. A folded dipole reception antenna.
D. An electronically steerable phased-array antenna that radiates a directional antenna pattern.
C. A folded dipole reception antenna.
3-70K5: Choose the only correct statement about the localizer beam system used by aircraft to find the centerline of a runway during an Instrument Landing System (ILS) approach to an airport. The localizer beam system:
A. Operates within the ssigned frequency range of 108.10 to 111.95 GHz.
B. Produces two amplitude modulated antenna patterns; one pattern above and one pattern below the normal 2.5 degree approach glide path of the aircraft.
C. Frequencies are automatically tuned-in when the proper glide slope frequency is selected on the aircraft’s Navigation and Communication (NAV/COMM) transceiver.
D. Produces two amplitude modulated antenna patterns; one pattern with an audio frequency of 90 Hz and one pattern with an audio frequency of 150 Hz, one left of the runway centerline and one right of the runway centerline.
D. Produces two amplitude modulated antenna patterns; one pattern with an audio frequency of 90 Hz and one pattern with an audio frequency of 150 Hz, one left of the runway centerline and one right of the runway centerline.
3-70K6: On runway approach, an ILS Localizer shows:
A. Deviation left or right of runway center line.
B. Deviation up and down from ground speed.
C. Deviation percentage from authorized ground speed.
D. Wind speed along runway.
A. Deviation left or right of runway center line.
