Section II PREVENTIVE MAINTENANCE CHECKS AND SERVICES
checks and services listed in the periodic pre-
4-10. Preventive Maintenance
ventive maintenance checks and services chart
Periodic preventive maintenance checks and
(para 4-11) in the sequence listed.
services on the C-8157/ARC and MT3802/ARC
are required. Periodic preventive maintenance
checks and services and must be performed after
100 hours of flying time. All deficiencies or short-
comings will be recorded in accordance with the
requirements of DA Pam 738-750. Perform all the
4-11. Preventive Maintenance Checks and Services Chart
The checks in the "Interval" column are to be performed in the order listed.
Item to be inspected
Equipment is not ready/available if:
Equipment fails to support assigned mission.
Control Indicator Performance check.
Perform operational checks as described in
Damage to the mounting or equipment.
Check and ensure that the TSEC/KY-28
Cipher equipment is mounted securely.
*Do this check before each deployment to a mission location. This will permit any existing problems to be corrected before the mission starts.
The check does not need to be done again until redeployment.
Section III. TROUBLESHOOTING
b. If the corrective measures indicated do not
4 - 1 2 . General
result in correction of the trouble, higher level
a. Control Indicator C-8157/ARC must be re-
maintenance is required.
moved from the aircraft if it fails in any of its
operations during organizational maintenance, or
at anytime it proves to be faulty.
4-13. Troubleshooting Chart
a. Replace lamp (para 4-8).
a. Defective POWER ON indicator
POWER ON indicator lamp does
b. Press POWER ON switch CB-1
not light when POWER ON
to the ON (up) position and
b. POWER ON switch CB-1 has
switch CB-1 is set to ON (up)
release. If CB-1 continues to
tripped to overload.
trip, higher level repair is re-