| 摘要 |
A dual I.L.S. glide slope system for allowing a normal 3 DEG descent path plus an additional 6 DEG descent path which can be used for noise abatement procedures etc. In accordance with the present invention these glide slopes are provided on a single assigned R.F. channel with no inverted courses interposed. The first signal null will occur at 9 DEG elevation when all signals will be zero, producing a "flag" alarm.
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