Bendix
Avionics
Division
ADF-T12C/D AUTOMATIC
DIRECTION FINDER SYSTEM
Installation
Manual
2-7.A.
(5) Position the aircraft on aknown true heading.
( 6 ) P o s i t i o n t h e r e c e i v e r f u n c t i o n s w i t c h t o A D F.
(7) Compare bearing on servo amplifier/indicator with true bearing. Bearings must
agree within ±3 degrees with little or no ’hunting" observed on indicator.
(8) Press TEST button on front panel of receiver and observe indicator pointer. Indi¬
cator pointer will rotate away from indicated bearing while TEST button is pressed.
(9) Release TEST button, and observe indicator pointer. Indicator pointer should
return to the indicated bearing.
(10) Repeat steps (1) through (9) on bands II and III.
(11) For ADF-T12D, select aband other than that containing the station dialed in. The
out-of-lock MON lamp should light.
(12) Return the band switch to the correct band. The out-of-lock MON lamp should go
out.
(13) If adual system is installed, turn one receiver OFF, check the other as described
then repeat for the second receiver.
(14) Rotate the azimuth knob to ensure full rotation of azimuth card (551RL only).
(15) Turn instrument lighting control ON. Ensure indicator lamps are operating.
2-7.B. FLIGHT CHECK
Airborne test should employ the following flight test procedure:
Using the REC mode, select astation of average power from adistance of about
50 miles. Using tuning meter in the 201C/D, adjust receiver frequency until
maximum signal strength is obtained.
(1)
(2) Fly toward the station.
Set the function switch to ADF.
(3)
Note the bearing on the servo amplifier/indicator. Unless the station is weak,
there should be no prolonged hunting by the indicator pointer.
Make a360-degree standard rate turn and observe the servo amplifier/indicator.
The indicator pointer should track the turn without "losing" the station.
Select arange station to check the over-the-station performance of the system.
Set the receiver to ADF and home-in on the range station.
(4)
(5)
(6)
(7)
2-11
Revised Oct/72
I.B. 2012-1
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