f. Remove any obstructions from the air inlets (front) and air
exhausts (rear) of the power amplifier and antenna coupler.
21. WEEKLY PREVENTIVE MAINTENANCE CHECKS AND SERVICES. Now that
know the daily maintenance routine for radio set AN/GRC-193, we
now ready to look at the operator's preventive maintenance checks
services. These checks and services must be performed every time
radio set is used or at least once weekly.
Operator's preventive maintenance checks and services.
B - Before
D - During