NARCO AVIONICS NAV122D, NAV122D/GPS
2.5.1 Continued
D. Glide Slope
1. Set test equipment and NAV Receiver to a GS frequency. Modulation should be a
standard GS centering signal.
Spec:
Centering,
±
1 needle width with no GS flag. visible
2. Change modulation to .091 ddm Up then Down.
Spec: Deflection, 1.5 dots,
±
1 needle width with a no GS flag visible.
3. Remove modulation or decrease test equipment RF output to minimum.
Spec: GS warning flag shall be in full view.
2.5.2 Flight Test
A flight test is recommended to perform the following checks and adjustments.
A. Check all avionics under actual operating conditions for abnormal indications (ignition noise,
audio distortion at in-flight volume settings, rotating beacon noise, interference between
avionics equipment etc.).
B. Proportion audio volume levels.
C. Look for variations in performance due to various landing gear and flight control surface
configurations.
D. Good excuse to go flying.
All of these tests must be performed at an ILS facility, on an airway, or in an area where the ground station
signal quality and strength has been verified.
A. Flying at an altitude of 6000ft above ground level (AGL) channel the NAV Receiver to a
VOR facility 50nm away.
1. Check course accuracy, warning flag indication, and left-right needle sensing.
2. Check the antenna pattern by flying the aircraft at a 10
°
bank completing a 360
°
turn: the
warning flag should remain out of view throughout the turn and audio should remain
intelligible.
B. Flying at an altitude of 6000ft AGL, channel the NAV Receiver to a VOR facility 10nm away
and fly inbound.
1. Check course width (
±
10
°
of selected radial).
2. Observe the VOR warning flag while approaching, passing over, and flying outbound:
TO-FROM indicator shall indicate correctly and the warning flag must not be observed
except when passing directly over the station.
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Summary of Contents for NAV122D
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