Radio Navigationmedium#1127
The outer marker of an ILS is identified by:
A
A continuous dash at 400 Hz with a blue light
B
Alternating dots and dashes at 1300 Hz with an amber light
C
Six dots per second at 3000 Hz and a white light
D
Continuous dashes at 400 Hz and a blue/purple light
CorrectExplanation
The outer marker transmits continuous dashes at 400 Hz (low tone) with a blue/purple cockpit light, located approximately 4-7 NM from the threshold.
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