Cross-Radials - P-12820121

T-45C TS INav-04; ADV INav-02

Components and Characteristics of the Instrument Landing System (ILS)

2. DME from a separate facility may be used within Terminal

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Instrument Procedures (TERPs) limitations:

DME (TERPs)

a. To provide ARC initial approach segments

b. As a FAF for BC approaches

As a substitute for the OM

NOTE: The DME of a separate facility is not, by FAA (AIM)

definition, authorized for use inside the outer marker inbound on an

ILS approach.

C. Cross-Radials

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Cross-Radials

1. May be generated by VOR or TACAN stations

2. No difference in the procedures used on ILS/LOC approaches than

any of the other types of approaches. However, the cross-radial

generated from a VOR station would require the ILS to be off tuned

on final

NOTE: Off-tuning the ILS frequency for VOR cross-radial fix

identification after final is not an acceptable option. TACAN cross-

radial identification poses no problem.

3. If DME is associated with ILS/LOC approach, use the DME as the

method to identify the aircraft position along the FAC

D. Compass Locator

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Compass Locator

Although the T-45C is not equipped to use a compass locator, the

following information is provided to give you a basic understanding of

the system

1. Low power transmitter which emits an omnidirectional signal in the

ADF range

2. Most often situated at MM or OM sites

3. Most transmitters have less than 25 watts of power and a range of

at least 15 nm. Some locations have up to 400 watts, and are used

as OM compass locators and may carry Terminal Weather

Broadcast (TWEB) information

4. If used as a Locator Outer Marker (LOM), the beacon will transmit

the first two letters of the localizer identifier. If used as the Middle

Marker (MM), the beacon will transmit the last two letters of the

localizer identifier

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