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 pressurize the two air data computers (AMM 34-11-00/201).
 S 865-016
 (9)  Use the pitot/static test set to make an altitude of 40,000 feet on
 the captain's altimeter.
 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
 put the ATC system on standby during this procedure.

 S 865-017
 (10)
 Connect the radio altimeter test set to the airplane. S 865-335

 (11)
 Set the radio altitude to 550 feet. NOTE: The airplane must be in the air mode before you increase

____ the radio altitude or the TCAS will fail.
 (a) Make sure the ND shows the TA ONLY indication. S 865-019
 (12) Set the radio altitude to 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 change 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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747-400 MAINTENANCE MANUAL
 S 865-026
 (13) Open this circuit breaker:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B10, ATC-L

 S 215-027
 (14)
 Make sure the ND and EICAS shows the TCAS OFF indication.

 S 865-070

 (15)
 Open this circuit breaker:

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

 S 215-028
 (16)
 Make sure the upper EICAS shows the TCAS SYSTEM advisory.

 S 865-029

 (17)
 Close this circuit breaker:

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

 S 215-075
 (18)
 Make sure the TCAS SYSTEM message clears from the upper EICAS.

 S 865-089

 (19)
 Push the SCEN key on the TCAS test set to show the scenario menu.

 S 865-091

 (20)
 Set up this scenario:

 (a)  
INTRUDER TYPE: ATCRBS ALT = ON

 (b)  
RANGE: 8.0 nm RATE: +500 kt

 (c)  
ALTITUDE: 39,900 ft RATE: 0 fpm

 

 NOTE: Make sure the vertical separation between the airplane
____ and the intruder is about or slightly less than 100 feet. You can change the airplane's altitude or intruder setup on the test set to achieve this.
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747-400 MAINTENANCE MANUAL
 S 865-305
 (21) Push the RUN/STOP key to start the test, and look for this sequence on the ND, PFD, and flight compartment speaker:
 (a)  The intruder moves down the 45 degree bearing mark to the
 center of the ND.
 (b)  The intruder has the correct relative altitude.
 NOTE: The relative altitude shown can be -00 or -01 depending____
 on your actual vertical separation. This is because
 TCAS can only display relative altitude by 100 foot
 increments.
 (c)  The intruder begins as Non-threat Traffic (open white diamond).
 (d)  The intruder changes to Proximate Traffic (solid white diamond)
 (e)  The intruder changes to a Traffic Advisory (solid yellow
 circle).
 (f)  The TCAS gives a "TRAFFIC, TRAFFIC" voice announcement on the
 flight compartment speaker.
 (g)  The intruder changes to a Resolution Advisory (solid red
 square).
 (h)  The TCAS gives a "CLIMB, CLIMB" or "CLIMB, CLIMB, CLIMB" voice
 announcement on the flight compartment speaker.
　
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