JUNE 1996
REV. C
16
5.
Check the remaining three cardinal points (90, 180, and 270).The
Left-Right needle should center within ±2.0 degrees ( ±1.5 degrees for
TSO'd indicator) with a TO flag.
6.
With OBS remaining at 270, set test equipment to 90.The Left-Right
needle should center within ±2.0 degrees ( ±1.5 degrees for TSO'd
indicator) with a FROM flag.
D. LOC
1.
Set test equipment and NAV Active display to a LOC frequency.
Modulation should be a standard LOC centering signal.The needle
should center within ± 2 needle widths (± 1 needle width for TSO'd
Indicator) with a TO flag.
2.
Change modulation to .093 ddm left, then right.Deflection should be
to the end of the Blue and Yellow areas on the Indicator.
3.
Remove modulation or decrease test equipment RF output to
minimum. NAV flag should be visible.
E. Glideslope
1.
Set test equipment and NAV Active channel to a GS frequency. Verify
that the Glideslope Receiver is channeled correctly. All 40 Glideslope
channels should be checked.
D. DME
1.
Set test equipment and NAV active channel to a DME frequency and
verify that the DME is being channeled correctly. All Mhz and Khz
channels should be checked.
2.10.2 COM General Preflight Test
With the aircraft engine(s), avionics equipment, and other on-board electronics
operating, transmit and receive on several different frequencies. There should be no
excessive interference and intelligible two-way communications should be
demonstrated.
