Garmin AT Inc. SL-70 Manual Do Utilizador

3.   Rotate the 

SMALL

 knob to change the character, rotate the 

LARGE

 knob to move the

cursor.

4.  Press 

IDENT

 to save the selection.

Self Test
The SL70 includes a self test that is executed every time the unit is turned on that checks the
receiver and transmitter operation as well as other internal functions.

Verify that the unit does not display a failure indication when turned on.

Altitude Input
Verify that the displayed altitude matches the altimeter pressure altitude (at 29.92).

External Inputs
If the external ident or standby inputs are connected, verify operation by:

a)  Verify that the unit goes to standby when the external standby input is pulled low.

b)  Verify that the ident LED turns on when the external ident button is pressed (must be in

the “ON” or “ALT” modes).

Performance (Ramp) Test
After installation, the transponder should be tested as specified in Appendix F of CFR 14 part
43, to AC 43-6A, and/or other appropriate regulations. The test is typically done as a ramp test
using a transponder ramp test set, such as the IFR ATC-600A. The ramp test includes checks
as follows.

Reference part 43 Appendix F:

a)  reply frequency

b)  suppression

c)  receiver sensitivity

d)  reply RF output power

Reference AC 43-6A:

•

    altitude reporting