Radio Navigationmedium#1128
The middle marker of an ILS transmits:
A
Continuous dashes with a blue light
B
Continuous dots with a white light
C
Alternate dots and dashes at 1300 Hz with an amber light
CorrectD
Dash-dot-dash at 400 Hz with a green light
Explanation
The middle marker transmits alternate dots and dashes at 1300 Hz (medium tone) with an amber cockpit light, approximately at the CAT I decision height.
Ready for a timed quiz?
Test yourself with random questions from Radio Navigation and all other ATPL subjects.
Start a Practice Quiz