A V I O N I C S L I M I T E D
2.4
POST- INSTALLATION CHECKOUT
An operation performance flight test should be made after the installation to ensure
satisfactory performance of the equipment in its intended environment.
The installing agency using appropriate ramp testing equipment should verify proper
unit operation prior to actual flight testing.
Before conducting the in-flight test, visually and functionally check that all aircraft
control assemblies have full travel and that no obstructions are present to interfere
with their normal operation. Plan and conduct a flight in VFR conditions to test the
INS
422
operation by flying a practice ILS approach. During the practice ILS approach,
check Localizer Left-Right and Glideslope Up-Down deflection. Check the Localizer
accuracy in relation to the ILS runway. Check the Glideslope accuracy in relation to
the published ILS approach altitude.
Verify the three light marker operations and audio at published locations depicted on
the approved approach flown. When Marker audio is present a marker audio mute
feature can be activated by pushing in momentarily (lightly) on the ON-VOL/MKR-
MUTE/BRG knob. This will shut off the marker audio for a few seconds and then
come back on if audio is still present.
Use this feature as often as desired
.
After flying a satisfactory practice ILS approach, select a local VOR station within
range and check the
INS 422
reception and unit function. A good rule for VOR
reception is that for every 1000 feet of altitude, you can expect a range of at least 10
nautical miles of acceptable VOR operation.
Check the Localizer/VOR identifier audio and set the desired volume level by rotating
the ON-VOL/MKR-MUTE/BRG knob.
INS 422 Installation/Owners Manual
Original Issue – June 2001
VPN 701034
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