a. You are the assigned operator and have not
3-23. Operator/Crew Preventive
operated the item since the last weekly.
Maintenance Checks and Services,
b. You are operating the item for the first time.
Receiver Transmitter RT-718/FRC-
The checks in the interval column are to be performed
Perform weekly as well as before operation PMCS
in the order listed.
B DA WM
Item to be inspected
Equipment is not ready/available if.
Antenna system and receiver front end
Check for loss of receiver sensi-
Receiver sensitivity falls below level for
after electrical storms.
tivity particularly after thun-
mission communications reliability.
derstorms. Use receiver "S" meter
on signal of known strength.
Antenna system and transmitter final.
Observe plates of transmitter final
If antenna system cannot be corrected within
for signs of operating too hot.
time needed to maintain mission communica-
Check VSWR on transmitter
output for high VSWR.
Transmitter frequency stability.
Check with distant station to de-
If transmitter stability causes loss of reliable
termine whether station trans-
mitter frequency is drifting.
Check crystal selected for use in
If spare crystal of selected frequency is not
transmitter for proper operation.
available and no alternate frequency is
available to fulfill mission`
Power resistor in final and drivers.
Inspect power resistors in final
Improper transmitter operation generates
and driver biasing circuits for
interference due to faulty tuning circuits or
signs of discoloration or cracking.
Also check final tank coils for
signs of corrosion or overheating.
Have distant station check signal
quality, and tune adjacent
frequencies to check for spurious
decomposition are toxic and irritating.
Inspect the exterior of the equipment. The exterior
ETHANE dissolves natural oils,
surfaces should be free of dirt and fungus
prolonged contact with skin should be
a Remove loose dirt with a clean, soft cloth.
avoided. When necessary, use gloves
which the solvent cannot penetrate. If
Adequate ventilation should be provided
the solvent is taken internally, consult a
FLUOROETHANE. Prolonged breath-
b. Remove grease, fungus, and ground-in dirt
ing of vapor should be avoided. The
from the equipment with a cloth dampened
solvent should not be used near heat or
Section VI. ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
3-25. Scope of Organizational
The instructions given in paragraph
Organizational maintenance consists of continuity
the organizational maintenance portions
checks, replacing fuses, tubes, and performing the
Change 6 3-18