Inspection Requirements. - SB-740-91-010245

SB 740-91-01

3. Inspection Requirements.

The following mechanical-visual inspections are applicable to all AN/PRC-77 series systems, sets, units, and assemblies

and further define the coded inspection criteria given in appendix A.

(1)

Inspect equipment covers and front panels for condition of finish and panel markings.

(2)

Inspect for dents, punctures, or warped areas.

(3)

Inspect spring lock fasteners and receptacles.

(4)

Inspect external surfaces for loose or missing screws or washers.

(5)

Inspect receptacles for condition of pins, contacts, mounting, and for foreign particles.

(6)

Inspect air filters and air outlet for excessive dirt or grit.

(7)

Operate all controls through all their positions. (Do not disturb screwdriver adjustments.) Controls shall

operate smoothly with no binding. Control knobs shall be tight on their shafts with no missing or loose

hardware.

(8)

Check for meter damage and broken indicator glass on radio set control and reflectometer.

(9)

Inspect all exposed metal surfaces for rust and corrosion.

(10)

Inspect safety wiring on the wing nut fasteners on the mounting.

(11)

Check the mechanical action of the switches and knobs. They shall move smoothly, free of binding and

scraping on the radio set control.

(12)

Inspect handles for looseness and defects.

4. Electrical Tests.

The following tests are to be performed, using the applicable data sheet (figure B-15) for Radio Set AN/PRC-77.

Step

Settings and Instructions

Normal Indication

1. Operational Test

(a) Position two AN/PRC-77's (RT-841/PRC-77) at least 25 feet apart.

(b) Set the power supplies for 10.0 VDC, and connect to "POWER" connector on the front panel of the RT-

841-PRC-77 with Test Cable No. 2.

B-57