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301 - ATPL - The MIDDLE MARKER of an Instrument Landing System (ILS) facility is identified audibly and visually by a series of:

Question 301 - Radio Navigation - ATPL - Airline Transport Pilot license

Two dashes per second and a blue light flashing
Dots and a white light flashing
Alternate dots and dashes and an amber light flashing
Dashes and an amber light flashing

Training tests and timed exam simulations ATPL - Airline Transport Pilot license