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The false glideslope was lost 15 seconds after it was acquired and AP CAUTION and FMA FAULT 2 events were recorded, meaning that the autopilots would continue to descend the aircraft on a 3-degree slope using inertial guidance. [7]: 27 One autopilot disengaged (LAND 2) and the remaining autopilots flew down to the decision height.
Emission patterns of the localizer and glide slope signals Glide slope station for runway 09R at Hannover Airport in Germany. In aviation, instrument landing system glide path, commonly referred to as a glide path (G/P) or glide slope (G/S), is "a system of vertical guidance embodied in the instrument landing system which indicates the vertical deviation of the aircraft from its optimum path ...
ILS planes. An instrument landing system operates as a ground-based instrument approach system that provides precision lateral and vertical guidance to an aircraft approaching and landing on a runway, using a combination of radio signals and, in many cases, high-intensity lighting arrays to enable a safe landing during instrument meteorological conditions (IMC), such as low ceilings or reduced ...
In addition, with no peripheral visual cues allowing for an orientation relative to the earth there can be an illusion of the pilot being upright and the runway being tilted and sloping. As a result, the pilot initiates an aggressive descent and wrongly adjusts to an unsafe glide path below the desired three-degree glide path. [13]: 3
A composite image of an Alliance Airlines Fokker 70 on final approach at Christmas Island Airport, illustrating the approach slope to the runway. The term glide slope is sometimes used to mean approach slope, although in precise usage the glide slope is the vertical guidance element of the instrument landing system. [2]
A useful formula pilots use to calculate descent rates (for the standard 3° glide slope): Rate of descent = (ground speed ⁄ 2) × 10. or Rate of descent = ground speed × 5. For other glideslope angles: Rate of descent = glide slope angle × ground speed × 100 / 60, where rate of descent is in feet per minute, and ground speed is in knots.
In its developed form, the OLS consists of a horizontal row of green lights, used as a reference, and a column of vertical lights. The vertical lights signal whether the aircraft is too high, too low, or at the correct altitude as the pilot descends the glide slope towards the carrier's deck. Other lights give various commands and can be used ...
This caused the airspeed to drop and the pitch attitude to increase; all this went unnoticed by the crew until the stick-shaker activated. Prior to this, air traffic control caused the crew to intercept the glide slope from above; this obscured the erroneous autothrottle mode and increased the crew's workload.
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