Contents
What is the glideslope intercept altitude?
The minimum altitude of an intermediate approach segment prescribed for precision approach that assures obstacle clearance.
How do you intercept ILS approach?
To fly an ILS, you first align your aircraft with the runway, using the localizer as guidance. This is typically done by radar vectors from ATC, or with a procedure turn. You then fly toward the runway and intercept the glideslope from underneath, so you don’t intercept a false glideslope.
Why should a pilot intercept a glideslope from below?
Objects below 5,000 feet AGL have a tendency to reflect glideslope signals. This can create false glideslopes, which are often at 9 degree and 12 degree angles to the runway. This is why pilots are always taught to intercept the glideslope from below, to ensure they don’t capture a “false” glideslope.
How far out can you intercept the localizer?
Localizer and glideslope signals have limited ranges. At most, reliable signals extend as far as 18 nautical miles or so, but that’s only for localizer guidance within 10 degrees of the course centerline.
What is a false glideslope?
A characteristic of the glide-slope portion of the ILS (instrument landing system), in which one or more false glide-slopes at different angles to the horizontal occur well above the true glide-slope.
Where is final approach fix on ILS?
For precision approaches, the final approach fix is defined as the glide slope intercept at the published altitude. This is identified in the chart’s profile view by the lightning bolt. For non-precision approaches, the final approach fix is identified by the Maltese cross.
How far out can you pick up glideslope?
What causes a false glideslope?
This is because of a radiation pattern of the antenna and the ground reflection of some of the transmitted energy, resulting in more than one overlapping lobe. The false glide-slopes occur at odd multiples of the true glideslope angle (typically 3°) (i.e., at 9° and 15°).
What happens if glide slope is intercepted between silky and Jakor?
For the example plate above, this would mean that if the glide slope were intercepted between SILKY and JAKOR the pilot would be considered to be past the final approach fix for all intents and purposes and might even configure the airplane for landing at that point rather than passing JAKOR at the published glide slope intercept.
Where does the ILS glide slope take place?
The ILS glide slope is intended to be intercepted at the published glide slope intercept altitude. This point marks the PFAF and is depicted by the “lightning bolt” symbol on U.S. Government charts.
Which is the final approach fix for ILS?
The lightning bolt is the final approach fix for precision approaches and the Maltese cross is the final approach fix for non-precision approaches. The ILS glide slope is intended to be intercepted at the published glide slope intercept altitude.
When does ATC authorize a lower intercept altitude?
If ATC authorizes a lower intercept altitude, the final approach segment begins upon glideslope/glidepath interception at that altitude. Does this paragraph imply that the FAF (FAP) for a precision approach fix (point) begins at the minimum glideslope intercept altitude when you have intercepted the glideslope at an altitude above that?