TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
e.
e.
On associated iff equipment,
Ppi sweep on master
place IFF ANT SCAN CONT
Control-Indicator C-
switch to IFF.
6988/TPN-18 remains
stopped.
f.
f.
On associated iff equipment,
Ppi sweeps on both
place IFF ANTENNA switch
Control-Indicators C-
to ON. Observe bearing rela-
6988/TPN-18 rotate, but
tionship between sweeps on
sweep on slave Control-
Control-Indicators C-6988/
Indicator C-6988/TPN-
TPN-18 for 60 sec.
18 is not synchronized
with sweep on master
Control-Indicator C-
6988/TPN-18.
g.
g.
On associated iff equipment,
Ppi sweep on both Con-
place IFF ANT SCAN CONT
trol-Indicators C-6988/
switch to RADAR. Observe
TPN-18 now rotate in
bearing relationship between
synchronization.
sweeps on Control-Indicators
C-6988/TPN-18.
h.
h.
On master Pulse Generator 0-
Ppi sweep on master
1333/TPN-18, place SCAN
Control-Indicator C-
switch to OFF.
6988/TPN-18 stops. Ppi
sweep on slave Control-
Indicator C-4988/TPN-
18 continues to rotate.
10-------------------------------- ------------------------------
a.
a.
On both Pulse Generators O-
None.
1388/TPN-18, place SCAN
MODE switch to SEARCH,
SCAN switch to OFF, and
RANGE MILES switch to 20.
b.
b.
Replace front and rear covers
None.
on Radar Receiver Transmitter
RT-818/TPN-18.
Section III. CONTROL-INDICATOR C-6988/TPN-18 TESTS
4-14.
General
4-15.
Physical Tests and Inspection
of Control-lndicators
This section contains all direct support mainte-
C-6988/TPN-18
nance tests for Control-Indicator C-6988/
TPN-18. Perform the tests on both Control-Indi-
a.
Test Equipment and Materials Required.
cators C-6988/TPN-18 as applicable. Ensure that
None.
Radar Set AN/TPN-18 has been adjusted and
b.
Equipment Conditions.
aligned after repairs before performing tests in
(1) Radar Set AN/TPN-18 turned off.
this section. Refer to paragraphs --15 through
(2) Rear cover removed from Control-Indica-
3-46 for adjustments and alignment instructions.
tor C-6988/TPN-18.
c. Procedure.
Control settings
Step No.
Test Equipment
Equipment under test
Test procedure
Performance standard
1----------------------------------- None
-----------------------
Inspect exterior of Control-
Frames, cases, and exterior
Indicators C-6988/TPN-18
painted surfaces are
for damaged frames, cases, and
mechanically sound, with
painted surfaces, and evidence
no damage or corrosion.
of corrosion.
Inspect all interconnecting cables
2----------------------------------- None
-----------------------
Interconnecting cables are
and cable connectors for evi-
serviceable, properly con-
dence of deterioration, proper
nected, and tight.
connections, and tightness.
4-31
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