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The BITE monitor continuously tests transponder functions during normal system operation(not in test mode). Internal and external failures are recorded in the flight fault memory.

 (4)  
All faults detected during flight are stored in a fault memory. Faults occuring on the ground are only stored when the TEST witch is pushed. The recorded faults are used to assist bench level trouble shooting. The air/ground relay discrete enables the flight count.

 (5)  
If no valid interrogations are received by the ATC transponder after a certain period, the BITE initiates a self-test. During this test, the test oscillator sends an ATCRBS and Mode S interrogation to the receiver causing the transponder to reply. The interrogation signal is processed as usaual and the processor checks the receiver output to find out if the signals were properly decoded. The processor also examines the transmitter output to determine whether the correct reply was made.

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E23374
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 D.  Control
 (1)  
Turn on procedure.

 (a)  
Supply electrical power (Ref 24-22-00/201).

 (b)  
Make sure that these circuit breakers are closed:

 1)  P7 Overhead Circuit Breaker Panel a) NAV RADIO ATC L b) NAV RADIO ATC R c) NAV RADIO ATC ANTENNA SW

 (c)  
Make sure all interfacing systems are serviceable.

 (d)  
Set the transponder select switch to the desired system.

 (e)  
Set the mode switch on the ATC control panel to the XPNDR position.

 

 (2)  
Turn off procedure.

 (a)  
Make sure these circuit breakers are open:

 1)  P7 Overhead Circuit Breaker Panel a) NAV RADIO ATC L b) NAV RADIO ATC R c) NAV RADIO ATC ANTENNA SW

 (b)  
Remove electrical power if it is not necessary (Ref 24-22-00/201).

 

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747-400
MAINTENANCE MANUAL

DB99CA DW2371A B99 LEFT ATC TRANSPONDER (E2-3)

 

MODE-S BIT 1 MODE-S BIT 3 MODE-S BIT 2 MODE-S BIT 4 MODE-S BIT 5 MODE-S BIT 6 MODE-S BIT 7 MODE-S BIT 8 MODE-S BIT 9 MODE-S BIT 10 MODE-S BIT 11 MODE-S BIT 12 MODE-S BIT 13 MODE-S BIT 14 MODE-S BIT 15 MODE-S BIT 16 MODE-S BIT 17 MODE-S BIT 18 MODE-S BIT 19 MODE-S BIT 20 MODE-S BIT 21 MODE-S BIT 22 MODE-S BIT 23 MODE-S BIT 24 MODE-S COMMON
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
E15
E14
E13
E12
E11
E10
E9
E8
E7

E6

DB100CA DW2281A W4230 WIRE B100 RIGHT ATC INTERFACE TRANSPONDER UNIT (WIU) (E2-2) (E2-2)

PROGRAMMING PINS WHICH HAVE A BIT VALUE OF 1 ARE CONNECTED TO THE WIRE INTERFACE UNIT. PROGRAMMING PINS WHICH HAVE A BIT VALUE OF 0 ARE NOT CONNECTED TO THE SHORTING RECEPTACLE MODE-S BIT 1
B1
MODE-S BIT 3
B2
MODE-S BIT 2
B3
MODE-S BIT 4
B4
MODE-S BIT 5
B5
MODE-S BIT 6
B6
MODE-S BIT 7
B7
MODE-S BIT 8
B8
MODE-S BIT 9
B9
MODE-S BIT 10
B10
MODE-S BIT 11
C11
MODE-S BIT 12
C12
MODE-S BIT 13
C13
MODE-S BIT 14
C14
MODE-S BIT 15
C15
MODE-S BIT 16
B15
MODE-S BIT 17
B14
MODE-S BIT 18
B13
MODE-S BIT 19
B12
MODE-S BIT 20
B11
MODE-S BIT 21
C10
MODE-S BIT 22
C9
MODE-S BIT 23
C8
MODE-S BIT 24
C7
MODE-S COMMON
C4

W4220 WIREINTERFACE UNIT (WIU) (E2-2)
MODE-S Programming Pin Locations for ATC-1 and ATC-2 Transponders
Figure 4

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