IFR NAVAIR NAV-750

NAVAIR 17—2OAX—737
4.8 RF LEVEL METER TESTS
4.8.1 Set the TI controls as follows:
FREQUENCY MHz switches to 108.000
Meter function switch to RF
4.8.2 Verify that the TI meter needle is aligned over the RF level vertical mark within ±1.5 needle widths.
4.8.3 Set the TI FREQUENCY MHz switches to 110.000.
NOTE NAV—750B is tested from 110.000 to 150.000 MHz, and from 330.000 to 335.000 MHz,
only.
4.8.4 Advance the TI FREQUENCY MHz switches in 20 MHz steps to 335 MHz (after 330 MHz setting,
set to 335 MHz), and at each setting, verify that the TI meter needle remainsalignedover the RF Level
mark within ±1.5 needle widths.
• 4.8.5 If the TI is a NAV—750B, proceed withstep 4.8.6. Otherwise, if the TI is not a NAV—750B, skip to
subsection 4.9.
4.8.6 Setthe TI FREQUENCY MHz switches to 072.000.
4.8.7 Verify that the TI meter needle is aligned over the RF Level vertical mark within ±1.5 needle widths.
4.8.8 Advance the TI FREQUENCY MHz switches in 2.0 MHz steps to 78.000 MHz, and at each setting,
verify that the TI meter needle remains aligned over the RF level mark within ±1.5 needle widths.
4.9 VOR BEARING TESTS
4.9.1 Set the TI controls as follows:
FREQUENCY MHz switches to 108.000 MHz
30 Hz tone MOD control to CAL (UNCAL lamp off)
1020 Hz indent tone MOD control to CAL (UNCAL lampoff)
9960 Hz FM tone MOD control to CAL (UNCAL lampoff)
BEARING-FREQ switch to BEARING
TO-FROM switch to TO
4.9.2 Connect the navigation indicator T!S input connector to the TI rear panel DEMOD (J23)
connector.
4.9.3 Press the TI 0° VOR bearing selectpushbutton, andensure that the TI bearing display indicates
0.0°.
4.9.4 Verify that the navigation indicator TIS indicates 000.00° ±0.05°.
18