T-39 FLIGHT PREPARATION
the blue "OM" light flashing. The Outer Marker is co-located with the FAF and the
approximate position for glideslope interception. The Middle Marker always transmits at
1300 Hz, is co-located with the MAP or DH, and is indicated by an aural tone and the amber
"MM" light flashing
5. Compass Locators
A Compass Locator is an NDB used in conjunction with, or in place of a Middle and/or
Outer Marker. They are tuned up on the ADF (see Mobile Regional ILS 14). You will need
to select the ADF on the Bearing needle on the EHSI. Upon station passage it will swing
from 12 to 6 o'clock.
6. Timed ILS
As a back-up, a timing box near the bottom of an approach plate will give the time
required to travel from the Outer Marker (FAF) to the Middle marker (DH/MAP).
For more on the ILS/Localizer system, refer to the AIM (a copy is located in the ready
room). Your instructor will brief and assist you with your first ILS approach, but you still
must function as a crewmember, so try to do as much as you can on your own. If you have
any questions, contact your personal advisor, any T-39G instructor, or pilot.