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747-400 MAINTENANCE MANUAL
 S 865-194
 (10) Enter the loss of the cable in the LOSS field.
 NOTE: The cable loss values should be listed on the cable.
____
 E. Test the TCAS System
 S 735-029
 (1)  Do the TCAS Bearing Accuracy Test as follows:
 (a)  
Set the mode switch on the control unit to the TA ONLY position.

 (b)  
Push the SCEN key on the TCAS test set to show the scenario menu.

 (c)  
Set up this scenario:
 1) INTRUDER TYPE: ATCRBS ALT = OFF
 2) RANGE: 8.0nm RATE: 0 kt

 (d)  
Use the test set to interrogate the four quadrants of the TCAS antenna at bearings of 0, 90, 180, and 270 degrees.

 NOTE: Shield the bottom TCAS antenna with an antenna shield.
____ This is to test the top TCAS antenna. You may have to get up high to be able to interrogate the top TCAS antenna from the rear of the airplane.
 (e)  
Push the RUN/STOP key to start the test. 1) Make sure the ND shows the intruder's bearing |15 degrees.

 (f)  
Shield the top TCAS antenna or move the test set close (about 6 feet) to the bottom TCAS antenna.

 NOTE:____This is to test the bottom TCAS antenna. If you moved the test set, you must change the test set setup accordingly.
 WARNING: MAKE SURE THE GROUND LOCKS ARE INSTALLED ON ALL THE
_______ LANDING GEAR [BEFORE YOU MOVE THE CONTROL LEVER]. WITHOUT THE GROUND LOCKS, THE LANDING GEAR CAN RETRACT AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (g)  Make sure the ground locks are installed or the nose and main landing gear (AMM 09-11-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (h)  
Put the gear lever in the OFF position.

 (i)  
Do the steps in the Bearing Accuracy Test again for the bottom antenna.

 S 215-030
 (2)  Make sure the flaps setting is at 5 degrees or less.
 NOTE: Aural warnings may sound if flaps setting is greater than 5
____
 degrees.

 S 865-031
 WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE GIVEN 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.
 (3)  
Do the "Prepare Safety-Sensative Systems for Air Mode Simulation" task (AMM 32-09-02/201).

 S 865-032

 (4)  
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 865-170
 (5)  
Set the transponder select switch on the control unit to the L or 1 position.

 (6)  
Make sure the mode switch on the control unit is on the TA/RA.

 S 215-173
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
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 (7)  Push the TEST switch on the front panel of the TCAS computer.
 (a)  Make sure a TCAS self-test does not occur.
 S 865-015
 (8)  Connect a pitot/static test set to the airplane so that you can
　
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