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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-313
(22)
Set the EFIS control unit to map mode and a range of 20 on the ND.
S 865-314
(23)
Supply power to the TIC T-49 test set.
(a) Make a note of the software Rev X.X of the test set.
E. TCAS Bearing Accuracy Test
S 865-315
(1)
Set the intruder type switch on the T-49 to the ATCRBS position.
S 865-316
(2)
Set the scenario switch on the T-49 to the fixed intruder scenario position (+1000).
NOTE:____Shield the bottom TCAS antenna. 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.
S 865-317
(3) Push the interrogate switch on the T-49.
(a) Make sure the T-49 display shows the type of intruder set.
S 865-318
(4) Use the test set to interrogate the four quadrants of the TCAS antenna at bearings of 0, 90, 180, 270 degrees.
(a) Make sure the ND shows the intruder's bearing | 15 degrees.
S 865-152
(5) Set the scenario switch on the T-49 to the fixed intruder scenario position (-1000).
NOTE: Shield the top TCAS antenna or move the test set close (10
____ feet) to the bottom TCAS antenna. This is to test the bottom TCAS antenna.
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747-400 MAINTENANCE MANUAL
S 945-045
(6) Set the power setting to low (LO) on T-49 with (HI/LO) power setting switch.
NOTE: A HI power setting can increase the likelihood of multipath
____
problem.
S 865-046
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.
(7)
Make sure the ground locks are installed or the nose and main landing gear (AMM 09-11-00/201).
S 865-047
(8)
Put the gear lever in the OFF position.
S 865-319
(9)
Do the steps in the bearing accuracy test again for the bottom antenna.
F. TCAS Intruder Test
S 865-320
(1)
Put the T-49 directional antenna 45 degrees to the right of the center line of the airplane with a 50 feet separation from the airplane. The directional antenna will send signals to the TCAS antenna.
S 865-321
(2)
Set the scenario switch on the T-49 to the straight approach 14 nMi position.
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747-400
MAINTENANCE MANUAL
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(3) Set the intruder type switch to the MODE S position.
S 865-322
(4) Push the interrogate switch.
(a) Make sure the T-49 display shows the correct intruder type.
S 865-323
(5) Push the interrogate switch to start the scenario.
(a) Make sure the T-49 display shows the airplane's altitude |100
feet and the correct scenario (Range 14nMi, Co-Altitude,
Closure rate 720 kts).
S 865-048
(6) Increase the airplane's altitude by 200 feet.
(a) Make sure this sequence occurs on the ND, PFD, and flight
compartment speaker:
1) The intruder ascends to the airplane symbol from the 45
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