Navigation aids that only provide accurate lateral guidance are called ‘Non-Precision Approaches’. ILS’s are referred to as ‘Precision Approaches’ because it guides the aircraft both vertically and laterally. They can be used to facilitate an approach and enhance the flight crews situational awareness. ILS’s tend to be utilised regardless of how far away the pilots can see the runway due to their accurate guidance. Such systems are less accurate than an ILS which restricts the weather in which the pilots can land. ILS’s aren’t available at all airports and some airports have other navigation aids available to help guide the aircraft. A Category III approach allows the autopilot to land the aircraft itself, however, a CAT I approach requires the pilot to manually land the aircraft. In some conditions (when it’s very foggy), only the autopilot can land the aircraft as the pilots wouldn’t have sufficient time to react if they only saw the runway at the last second. The pilots are then able to make corrections to the aircraft’s flight path to ensure it remains inline with the runway and descends at the correct rate.Įither the autopilot can fly the approach, or it can be manually flown by the pilots. The radio beam signals are interpreted by the aircraft’s computer systems and relay this information to the pilots. For most ILS’s the pilots should be lined up with the runway centreline and on a 3 degree glide path, but some ILS’s, like London City Airport have a steeper approach of 5.5 degrees. The ILS receiver fitted on the aircraft measures the difference in depth of modulation (DDPM) between the signals. The ILS works by sending 2 beams up from the landing runway, one telling the pilots if they or high or low (known as the glideslope) and the other telling them if they are left or right of the runway centre line (known as the localiser). It is used to help provide lateral and vertical guidance to the pilots when landing an aircraft. Whilst the ILS is used for most landings, it is most useful when it’s cloudy or the visibility is poor, as it allows the pilots (or autopilot) to fly the aircraft all the way down to the runway, even if they only manage to see the runway in the final few seconds. Why are the Lights Dimmed for Take-off?.Why are there still ‘No Smoking’ signs on planes?.Opening the Window Blinds For Take-off & Landing?.What Speed Does a 747 Take-off and Land?.Pilot Uniform Guide: What do the Stripes Mean?.Long Haul vs Short Haul a Pilots Perspective.How Many Days Off Do Pilots Get a Month?.Annual Training Requirements For Airline Pilots.Are Thunderstorms Dangerous To Aircraft?.What Speed Does a Boeing 777 Take-off and Land?.What Happens if a Passenger Jet Flies Too High?.What Could Cause a Double Engine Failure?.Can a Plane fly if all its Engines have Failed?.Boeing 737NG Simulator Assessment Guide.Pilot Aptitude Testing Practice – JobTestPrep.CV & Cover Letter Tailoring Express Service.Simulator Experience For Aspiring Pilots.How old Is too old to start Flight Training?.Can I be an Airline Pilot if I have Diabetes?.How Much Does It Cost to Train as a Pilot?.Integrated Training Organisation Comparison.How to Finance Commercial Flight Training.Education & Qualifications Requirement For Pilots.
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