Step	System	Action
1.	Function selector knob	T/R
	Allow 90 seconds for warmup
2.	Course	SET TO 180°.
3.	Tacan test button	PRESS AND RELEASE
4.	Observe the following:
	a. Test indicator	Flashes momentarily.
	b. Course and range flags	In view.
	c. Bearing pointer	Slews to 270° for about 7 seconds.
	d. Course and range flags	Out of view.
	e. Distance	Indicates 0.0 +0.5 miles (-0.5 miles indicated as 399.5 miles).
	f. Bearing pointer	Slews to 180° +3°.
	g. Course deviation indicator	Within 1/2 dot from center.
	h. TO-FROM indicator	Indicates TO.
	i. After about 15 seconds, Course and range flags in view until test complete.

Step	System	Action
1.	ILS frequency Selector	Select frequency on indicator.
2.	Press VOR/MKR Test pushbutton	Marker beacon lights illuminate.
3.	VOR Frequency selected	Must be selected with a valid VOR Signal present.
4.	Course selected	315° on the HSI course selector.
5.	HSI mode	In VOR/ILS.
6.	Press the test pushbutton	Initiates the test.
	a. Course deviation indicator moves to center (with a maximum allowable error of ±4°).
	b. "To-from" indicator on HSI indicates TO.
	c. Marker beacon lights illuminate
	d. Bearing pointers on HSI and BDHI swing to 315°