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 S 715-071
 (4)  Do the TCAS Operational Test.
 S 865-072
 (5)  Put the T-49 directional antenna about 50 feet in front of the airplane on the center line. The directional antenna will send signals to the TCAS antenna.
 NOTE:____ 50 feet separation between the TCAS antenna and the directional antenna is recommended. A separation between 10 to 100 feet will provide satisfactory results. Make sure there is a line of sight between the airplane's ATC, TCAS antennas and the test set directional omnidirectional dipole antennas. Also, make sure the airplane under test is closer to the test set than other active transpondersthat are near.
 S 865-308
 (6)  Connect the cable of the directional antenna to the T-49 antenna connector.

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747-400
MAINTENANCE MANUAL

 S 865-071
 (7)  Set the transponder select switch on the control unit to the L or 1 position.
 S 865-309
 WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE REFERENCED TASK TO
_______ PREPARE THE SAFETY SENSITIVE SYSTEMS FOR THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (8)  
Do the "Prepare Safety-Sensative Systems for Air Mode Simulation" task (AMM 32-09-02/201).

 S 865-105

 (9)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P7 Overhead Circuit Breaker Panel: 1) 7F22, LANDING GEAR DSP & CONT PRI 2) 7F23, LANDING GEAR DSP & CONT ALTN 3) AIRPLANES WITH THE "GND SAFETY RELAY" CIRCUIT BREAKER
 INSTALLED AT PANEL GRID LOCATION 7H08; 7H08, GND SAFETY RELAY
 S 865-310
 (10) Push the TEST on the front panel of the TCAS computer.
 (a)  Make sure a TCAS self-test does not occur.
 S 865-035
 (11)
 Set the mode switch on the control unit to the TA/RA position.

 S 865-331

 (12)
 Connect to radio altimeter test set to the airplane.

 S 865-329

 (13)
 Set a radio altitude of 2400 feet.

 NOTE: Increase the radio altitude by 600 feet per minute (fpm) or
____ less. RAs are inhibited below 600 feet during climb with TCAS change 7.0 and 1100 feet with TCAS version 6.04a. So TA ONLY will show at low altitude.
 (a)  Make sure the TA ONLY indication clears from the ND when the radio altitude is greater than 1100 feet.
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A
747-400 MAINTENANCE MANUAL
 S 865-330
 (14) Open this circuit breaker:
 (a)  On the P7 Overhead Circuit Breaker Panel:
 1) 7B10, ATC-L

 S 215-040
 (15)
 Make sure the ND and EICAS shows the TCAS OFF indication.

 S 865-041

 (16)
 Open this circuit breaker:

 (a)  On the P7 Overhead Circuit Breaker Panel:
 1) 7B22, ATC-R

 S 215-042
 (17)
 Make sure the upper EICAS shows the TCAS SYSTEM advisory.

 S 865-043

 (18)
 Close this circuit breaker:

 (a)  On the P7 Overhead Circuit Breaker Panel:
 1) 7B10, ATC-L
 2) 7B22, ATC-R

 S 215-044
 (19)
 Make sure the TCAS SYSTEM message clears from the upper EICAS.

 S 865-311

 (20)
 Connect a pitot/static test set to the airplane so that you can pressurize the two air data computers (AMM 34-11-00/201).

 S 865-312

 (21)
 Use the pitot/static test to make a barometric altitude of 40,000 feet.

 NOTE: The 40,000 feet barometric altitude is chosen to minimize
____ false TCAS alert to TCAS equipped airplanes nearby. Make sure to have altitude reporting function of the ATC off or the ATC system on standby during this procedure.
　
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