During this exercise make a panel illumination check:
COM READOUT SEGMENTS AND TRANSFER CHECK
- Set 120.20 Active -
136.95 Standby, push arrowed white transfer button. If complete frequencies were
seen in both positions - all segments are OK. (Transfer button does not illuminate.)
TRANSMIT
- "T" will be seen to the right of the Active frequency whenever the
Mike Key is depressed.
DIMMING CIRCUIT
- The photocell, being sensitive to light,
will dim the display when an opaque material is placed upon it. The display will
"come back" upon taking the material away.
KEEP-ALIVE CHECK
- Set the COM Active window to 120.20. Turn
the MK-12DR OFF. Wait 15 seconds and turn the MK-12DR On. The Active wind-
ow should display 120.20 and the Standby 121.90.
2.11 FLIGHT TEST
A flight test is recommend 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 equipments, etc.).
B. Look for variations in performance due to various landing gear and flight
control surface configurations.
All of these tests must be performed at an ILS facility, on an airway, and in an area where
the ground station signal quality and strength has been verified.
2.11.1 NAV Section
VOR
A. Flying at an altitude of 6000 feet above ground level (AGL), channel
the NAV Active to a VOR facility 50 NM away.
1. Check course accuracy, warning flag indication, and Left-
Right needle sensing.
2. Check the antenna pattern by flying the aircraft in a 10 degree
bank completing a 360 degree turn: The warning flag should
remain out of view throughout the turn and audio should
remain intelligible.
JUNE 1996 REV. C
17
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