Becker ATC 3401 - 3. Mechanical installation; 4. Aircraft wiring

(6) Checking mode A coding
(a) Set code 0000 on the transponder, resulting in only the frame pulses
F 1 and F 2 being visible on the oscilloscope.
(b) Set code 7777, this must produce all 12 reply pulses including the
frame pulses on the oscilloscope.
(7) Checking mode C coding
If an encoding altimeter is connected to the transponder, check with the
aid of the MoA Gilham code whether the coded pulse sequence agrees
with the measured altitude. If the encoding altimeter is not connected
to the transponder it transmits in mode C operation the frame pulses
only.
3. Mechanical installation
A. The ATC 3401 - (1) - R transponder is to be fitted at a suitable point in the
aircraft. This is usually the avionics compartment. The dimensions necessary for the
installation are shown in Fig. 2-2.
B. First secure the mounting plate using four bolts and then slide the transponder
into the mounting plate and lock in position using the two quick release fasteners.
4. Aircraft wiring
A. The aircraft wiring of the transponder is shown in Fig. 2-6.
CAUTION : The transponder supply lines must not be loomed together with
other equipment looms. In addition care must be taken to avoid
running all transponder wiring in the close vicinity of ADF or other
pulse equipment looms.
INSTALLATION AND OPERATION
ATC 3401 - (1) - R
Page 2-3
34-50-03 June 15/96
UNCONTROLLED COPY IF PRINTED