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THRESHOLD CROSSING HEIGHT (TCH)

Instrument Procedures

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TCH

The theoretical height above the runway threshold at which the aircraft’s glideslope antenna would be if the aircraft maintains the trajectory established by the mean ILS glideslope or the altitude at which the calculated glidepath of an RNAV or GPS approach crosses the threshold.

Source FAA Pilot/Controller Glossary · checked 2026-08-25

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