Localizer
- valid and reliable signal coverage 35 degrees on either side of front course centre line up to 10 NM from transmitter
- 10 degrees up to 18 NM from transmitter for front and back courses
- 3-letter identifier
- starts with 'I' if aligned within 3 degrees of runway heading
- starts with 'X' if more than 3 degrees
- CDI needle deflection is 2.5 degrees from centre to full-scale
Glideslope
- beam depth is 1.4 degrees (0.7 above and below)
- standard glidepath is 3 degrees
Backcourse - Localizer only
- beware of reverse sensing!
- with an HSI, the track bar must be selected to the outbound course on localizer back course approaches in order to obtain positive track bar sensing
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