Operational Connections and Start-Up Procedures.

TM 55-4920-430-13

Table 2-2. AFCS Bench Test Set Initial Switch Positions - Continued

CONTROL

POSITION

CONTROL PANEL SIMULATION Group

AFCS switch

OFF

HEADING switch

DISENGAGE

BARO switch

DISENGAGE

RADAR switch

DISENGAGE

2-6. Operational Connections and Start-Up Procedures.

a. Connection Procedures. (See fig. 2-3.)

(1) Set all test set controls to initial positions listed in table 2-2.

(2) On power cable W7, connect plug P1 to the test set POWER receptacle. Connect plug P2 to a

source of 115-volt 400-Hz ac. Connect plug P3 to a source of 28-volt dc.

(3) On Power cable W7, connect common return (plug P2 pin D) of the 115-volt AC 400-Hz

power supply to common return (plug P3 pin B) of the 28-volt DC power supply.

b. Start-Up Procedures.

(1) Check that all circuit breakers are closed.

(3) Set the AFCS POWER 115 VAC 400 HZ and +28 VDC switches to ON. The three indicator

lights in the AFCS POWER group shall come on.

(4) Set the LCT POWER switch to ON. The +28 VDC LCT POWER indicator light shall come

on.

(5) Check that the four CIRCUIT SELECT switches are at 00, 0, B, 0, left to right.

(6) Perform the self test sequence of table. 2-3.

(7) Check that the CONTINUITY TEST switches are at 00, 0. The continuity test light shall be

out.

(8) Set the CONTINUITY TEST UNITS switch to 1. The continuity test light shall come on.

(9) Set the CONTINUITY TEST UNITS switch to 2. The continuity test lamp shall go out.

( 10) Set the CONTINUITY TEST UNITS switch to 0.

(11) Set the AFCS POWER 115 V 400 HZ and +28 VDC Switches to OFF.

(12) If an AFCS computer unit is to be tested, connect as follows: (See fig. 2-4.)

(a) Connect plug P1 of cable W 1 to test set receptacle AFCS J1. Connect cable plug P2 to AFCS

computer unit receptacle 1.

(b) Connect plug P1 of cable W2 to test set receptacle AFCS J2. Connect cable plug P2 to AFCS

computer unit receptacle J2.

computer unit receptacle J3.

Change 2