Results
#1. The coverage of an ILS localiser extends to _________either side of the on course line out to a range of ….. nm.
#2. The upper and lower limits of an ILS glide path transmitter having a 3.5° glide slope are:
The lower lobe starts at 0.45 x GP angle and the upper lobe ends at 1.75 x GP angle.
Coverage extends to 10NM and up to 8° either side of the centreline.
the limits of coverage of a 3.5° glidepath are:
Lower limit = 0.45 x 3.5°= 1.575°
Upper limit = 1.75 x 3.5° = 6.125°
#3. The minimum angle at which a false glide path is likely to be encountered on a 3°glidepath is:
The first false glidepath will be at about twice the normal glide angle and other weaker false glideslopes may exist at three or four times the glide angle.
A similar problem can occur with localiser beams and can create false centrelines but they are very weak and always outside the localiser coverage area.
#4. The visual and aural indications obtained when overflying an ILS middle marker are:
Identified by an amber light and an audible pattern of dot-dash-dot-dash (“. – . -“) at 1,300 Hz.
#5. An aircraft carrying out an ILS approach is receiving stronger 150 Hz signals than 90 Hz signals. The correct actions to be taken to place the aircraft on the centreline and on the glidepath are to fly: ? F
Localiser has 90 hz lobe on left and 150 hz lobe to the right
more 150 hz means you are right of centre line and should come to LEFT
Glide slope has the bottom lobe as 150 hz hence you are flying low so FLY UP
#6. In elevation the upper and lower limits of an ILS glide path transmitter having a 3.0 degree glide slope are:
lower lobe starts at 0.45 x GP angle and the upper lobe ends at 1.75 x GP angle.
Coverage extends to 10NM and up to 8° either side of the centreline.
the limits of coverage of a 3.0° glidepath are:
Lower limit = 0.45 x 3.0° = 1.35°
Upper limit = 1.75 x 3.0° = 5.25°
#7. A category 2 ILS installation encountered in the UK :
Category I A Category I ILS is one which provides guidance information from the coverage limit of the ILS to the point at which the localiser course line intersects the ILS glidepath at a height of 200 ft (60 m) or less above the horizontal plane containing the threshold.
Category II An ILS which provides guidance information from the coverage limit of the ILS to the point at which the localiser course line intersects the ILS g/path at a height of 50ft (15 m) or less above the horizontal plane containing the threshold.
Category III An ILS, which with the aid of ancillary equipment where necessary, provides guidance information from coverage limit of the facility to, and along, the runway surface.
#8. Which of these ILS indicators shows an aircraft on final approach left of the centre line and at maximum safe deviation below the glide path ?
For a 5 dot display maximum safe deviation below glide slope is 2.5 dots fly up
the vertical needle is localiser needle
horizontal needle is glide slope needle
both shows you where to fly in this case says up and right
#9. An aircraft tracking to intercept the ILS localiser inbound on the approach side but outside the published coverage angle:
#10. The outer marker of an ILS installation has a visual identification of:
#11. The specified maximum safe fly up indication on a 5 dot CDI is:
For a 5 dot display maximum safe deviation below glide slope is 2.5 dots fly up
#12. An aircraft is attempting to use an ILS approach outside the coverage sectors of an ICAO standard system:
#13. The coverage of the ILS glideslope in azimuth is:
#14. An aircraft’s Instrument Landing System glideslope and localiser receivers are receiving predominant 90Hz modulated signals. If the aircraft is within the coverage of the ILS, QDM of 264°, it is:
Localiser has 90 hz lobe on left and 150 hz lobe to the right
more 90 hz means you are left of centre line and should come to Right
Glide slope has the upper lobe as 90 hz hence you are flying above so FLY BELOW
Imagine flying into a runway with qdm 264°
That means radial 094°
you are flying left which makes you south as per the above diagram
#15. The coverage of the Micro-wave Landing System in the UK extends to ______nm up to a height of ______and ______degrees either side of the on course line.
