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TM 11-5831-201-20
37. Preservation
metal to protect it from further corrosion. Refer
to the applicable cleaning and refinishing practices
Remove rust and corrosion from metal surfaces by
specified in TB 43-0118.
lightly sanding them with fine sandpaper. Brush
two thin coats of paint (para 3-10) on the bare
Paragraph 38 deleted.
Paragraph 39 deleted.
Allow the first coat to dry thoroughly before ap-
3-10. Repainting and Refinishing Instructions
plying the second coat. Keep enamel thin to pro-
Repaint clean, bare metal surfaces with black
vide a smooth, even finish.
enamel. Apply enamel with a small, soft brush.
Section II. TROUBLESHOOTING
the aircraft cable, checks the cable for continuity
3-11. Troubleshooting Chart
as follows:
The following troubleshooting chart for the
(1) Turn off all power to the control set and
C1611D/AIC is based on operational symptoms
all externally connected equipment which com-
and is used to determine whether the C1611D/
prises the system.
AIC is operating in a normal condition. The
(2) Remove the control set from its mount-
symptoms listed in the Symptom column may not
ing and disconnect the plug connector from J1
be observed during normal operation or during a
receptacle at the rear (para 313b).
preflight check. If replacement of a C1611D/AIC
restores the system to normal operation, note the
(3) Operate Multimeter AN/URM-105 as
symptom on the repair tag and return the defec-
an ohmmeter and refer to the plug connector
tive C1611D/AIC to higher maintenance level
pin termination chart (b below).
for repair. If replacement of the C-1611D/AIC
(4) Check continuity of cable pairs (items
does not restore the system to normal operation,
1 through 8, 11 through 13, and 19 through 22)
troubleshooting of the other associated com-
by shorting the opposite ends of the correspond-
ponents of the system; transmitters, receivers,
ing cable pairs at the external equipment and
headset-microphones, control switches, and sys-
connecting the AN/URM105 to the two pin num-
tem cabling is required and should be referred to
bers listed for cable pair in the Pin column of the
higher category of maintenance.
chart (b below).
(5) Check the continuity of single leads
NOTE
(items 9, 10, and 14 through 18) by selecting a
Before using the chart below, be sure
second conductor to provide a return path for
that power is applied to the C1611D/
the meter circuit. Use a lead in the cable that is
AIC and that the other components of
known to be in good condition or the airframe
the system are properly energized.
for the second conductor. Short the opposite end
3-12. Aircraft Cable Continuity Checks
of the second conductor to the single lead under
a. Procedure. If the trouble symptom (para
test. Connect the AN/URM105 between the sec-
ond conductcr and the pin connector to the single
Change 2
3-3
.
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