757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 3(6)

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 2)  The BITE status test circuit in the autobrake card provides a monitoring test upon completion of the self test (system or ramp). The test monitors the following and provides its results to the BITE card: a) Deceleration selection - a deceleration selected b) Solenoid and servo valves - continuity and impedance c) Failure light drivers - continuous operation of light
 drivers d) Digital parity - check digital word parity for
 correctness e) Digital checksum - active location check f) Throttle switch - continuity g) Air/ground sensing - continuity
 (e)  BITE card signal processing
 1)  The multiplexer in the BITE card selects the analog voltages to be monitored. A continuous monitor test circuit receives and processes the voltage signals (valves, transducers, 26 v dc and 5 v dc regulated power sources and fault memory power), the digital memory data and the system status input. The test circuit provides a time delay of all voltage failure indications as required by the logic circuit. The data management in the BITE card microprocessor allows a buffered flow of signals between BITE card and all other cards.
 2)  When the ENABLE/VERIFY switch and the VERIFY switch on the control unit are pressed, the BITE card starts a system test (BRAKE TEST switch at NORM) or an autobrake test (BRAKE TEST switch at A/B and AUTOBRAKES selector switch in any one deceleration position). Failure detected during test is recorded in the memory and shown on the display. Successful tests feed no fault signal to the BITE card and the system is operable.
 C.  Control
 (1)  
Antiskid system (Fig. 1)

 (a)  
A 28 v dc supplies operating power for the antiskid system thru four circuit breakers (ANTISKID WHEELS, 1-5, 2-6, 3-7, and 4-8) on P11 to the control unit. The system turns on when the circuit breakers are closed. The system turns off when the circuit breakers are open. Antiskid system off is shown by the illumination of ANTISKID light on P5.

 (b)  
When normal (right) hydraulic system power is removed, the alternate (left) hydraulic system activates automatically. The left system provides hydraulic power to the alternate antiskid system.

 

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757
MAINTENANCE MANUAL

 (c)  
The front face of the control unit (Fig. 16) contains BITE switches. These switches are used for checking out transducer, valve and skid circuits on each wheel. A complete antiskid system test can also be performed with the BITE switches.

 (2)  
Autobrake system (Fig. 2)

 (a)  
Arm autobrake system during landing. 1) Place AUTOBRAKES selector switch to 1, 2, 3, 4 or MAX AUTO position to turn on system.

 2)  Observe that AUTOBRAKES light goes out and the switch remains in level selected. This shows the autobrake system is armed.
 3)  Depress either or both brake pedals.
 4)  Observe that AUTOBRAKES light comes on indicating the taking over of autobrake braking by manual braking. The EICAS display shows AUTOBRAKE advisory message. The selector switch automatically trips to DISARM.
 5) Place the selector switch to OFF. 6) Observe that AUTOBRAKE light goes out. The EICAS shows no AUTOBRAKE message. The autobrake system turns off.
 (b)  Arm autobrake system in RTO mode prior to takeoff. 1) Place AUTOBRAKES selector switch to RTO position to initiate autobrake RTO mode.
 2)  Observe that AUTOBRAKE light goes out and the switch remains at RTO. This shows that autobrake system of RTO mode is armed.
 3) Depress either or both brake pedals. 4) Observe that selector switch trips to OFF without indication, and the autobrake system turns off.
 

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757 FAULT ISOLATION/MAINT MANUAL
ANTISKID/AUTOBRAKE SYSTEM
COMPONENT SHT 102 FIG. QTY  ACCESS/AREA  REFERENCE 
CARD - AUTOBRAKE CIRCUIT  6  1  821, FWD CARGO COMPT, E5, ANTI-M102 SKID/AUTOBRAKE CONTROL UNIT,  32-42-01
CARD - BITE CIRCUIT  6  1  821, FWD CARGO COMPT, E5, ANTI-M102 SKID/AUTOBRAKE CONTROL UNIT,  32-42-01
CARD - INTERFACE/DISPLAY CIRCUIT 6 1  821, FWD CARGO COMPT, E5, ANTI-M102 SKID/AUTOBRAKE CONTROL UNIT,  32-42-01 
CARD - MAIN WHEEL CIRCUIT  6  4  821, FWD CARGO COMPT, E5, ANTI-M102 SKID/AUTOBRAKE CONTROL UNIT, 32-42-01 
CIRCUIT BREAKERS  1  FLT COMPT, P11 
ANTI-SKID 1-5, C1171  1  11S18  * 
ANTI-SKID 4-8, C1172 1  11S22  *
 AUTOBK ANTISKID TEST IND 1, C1176 1  11S21  *
　
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