INSTALLATION
1. General
Installation of the transponder ATC 3401 - (1) - R depends on the aircraft type
and its equipment. Therefore, only general information can be provided in this
Section.
2. Inspection before installation
Before the transponder is installed in an aircraft, a visual inspection for possible
transport damages shall be performed.
A. Visual inspection
Please look out for the following defects :
(1) Dirt, dents, scratches, corrosion, broken fastening elements on housing
and housing parts.
(2) Dirt and scratches on nameplate, front plate and inscriptions.
(3) Dirt, bent or broken pins, cracked insert of unit connector and antenna
socket.
(4) Missing screws.
B. Checking procedure
Connect the transponder with control unit to the test setup as shown in
Fig. 2-1 and carry out the following tests in the given sequence. Instead of
the transponder test set SQUAWK/NAUT I an equivalent test set or a ramp
test set can be used.
(1) Checking receiver sensitivity
(a) Set SQUAWK/NAUT I to mode A on and 400 interrogations per
second. Note that the amplitude of pulse P 2 is ≤ - 9 dB of pulse
P 1.
(b) Note that pulses P 1 and P 3 have equal amplitudes. Set the RF
input level to - 72 dB and observe that the transponder replies to
at least 90 % of the interrogations.
(c) Set SQUAWK/NAUT I to mode C and repeat test.
INSTALLATION AND OPERATION
ATC 3401 - (1) - R
Page 2-1
34-50-03 June 15/96
UNCONTROLLED COPY IF PRINTED
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