Flight Inspection of The PAR
A traditional PAR flight inspection procedure is performed without a navigation signal available to compare directly to a truth reference. A traditional PAR is flight inspected by comparing written notes between two observers, one taking notes at a truth reference system such as a theodolite and the other observer taking notes while observing the radar console, see ICAO Document 8071. The Transponder Landing System (TLS) non-traditional PAR can transmit an ILS signal that corresponds to the aircraft position relative to the precision approach. Therefore the graphical depiction can be directly verified using Instrument Landing System (ILS) flight inspection techniques. This direct measurement removes some ambiguity from the PAR flight inspection process.
Read more about this topic: Precision Approach Radar
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—Patricia Ireland (b. 1935)
“Thus the orb he roamed
With narrow search, and with inspection deep
Considered every creature, which of all
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The serpent subtlest beast of all the field.”
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—Friedrich Nietzsche (1844–1900)