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t-39 - Chief of Naval Air Training

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T-<strong>39</strong> FLIGHT PREPARATION STUDENT GUIDE<br />

E-2<br />

the blue "OM" light flashing. The Outer Marker is co-located with the FAF and the<br />

approximate position for glideslope interception. The Middle Marker always transmits at<br />

1300 Hz, is co-located with the MAP or DH, and is indicated by an aural tone and the amber<br />

“MM” light flashing<br />

5. Compass Locators<br />

A Compass Locator is an NDB used in conjunction with, or in place <strong>of</strong> a Middle and/or<br />

Outer Marker. They are tuned up on the ADF (see Mobile Regional ILS 14). You will need<br />

to select the ADF on the Bearing needle on the EHSI. Upon station passage it will swing<br />

from 12 to 6 o'clock.<br />

6. Timed ILS<br />

As a back-up, a timing box near the bottom <strong>of</strong> an approach plate will give the time<br />

required to travel from the Outer Marker (FAF) to the Middle marker (DH/MAP).<br />

For more on the ILS/Localizer system, refer to the AIM (a copy is located in the ready<br />

room). Your instructor will brief and assist you with your first ILS approach, but you still<br />

must function as a crewmember, so try to do as much as you can on your own. If you have<br />

any questions, contact your personal advisor, any T-<strong>39</strong>G instructor, or pilot.

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