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1) The AUTOBK ANTISKID TEST IND 1 and AUTOBK ANTISKID TEST IND 2 circuit breakers on panel P11 provide 28 v dc power to the autobrake selector panel. A switch on the panel provides pilot's choice for autobrake functions. Prior to landing, the pilot arms the system by placing the switch at 1, 2, 3, 4 or MAX AUTO. At touchdown, the brakes apply automatically and maintain the braking desired by the pilot. 2) When the switch is at RTO, the system functions for aborted takeoff. The system applies full pressure (3000 psi) to the brakes when the average wheel speed is above 85 knots and both engine thrust levers are moved to idle. 3) Should a failure occur, the system disarms and the selector switch automatically moves to DISARM. At DISARM, the system releases the autobrake pressure, an AUTOBRAKES light comes on, and the EICAS display will show the AUTOBRAKES advisory message. The pilot can turn off the AUTOBRAKES light and remove the message by placing the switch to OFF. The light will not go off and the message will remain if the solenoid valve on the autobrake module is faulty (solenoid valve output pressure switch shows high pressure).
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28V DC L BUSRTO LATCH AUTOBRKS/ANTISKID A/B LATCH TEST/IND 1
28V 23 1 DISARMRTO ARM A/B PWR RTO 28V 4 MASTER ARM RELAY R BUS
28V DCMAX OFF A/B 28V RTO PWR AUTOBRKS/ANTISKID TEST/IND 2
28V RTO P11 PWRARM SELECT RELAY A/B ARM A SPLY 28V IRS DECEL (L) B(SH 2) RATE COMPAREBRK DECEL RATEPRESS (SH 2) INITIALDECEL SELECTED BRAKESELECT 1234MAXAUTOBRAKE SEL SW FILL SW DECEL RATE AUTO RTO SELECTEDINTFCFULL RTO SEL OFF/DISARM SELECTED PRESS A/B ARMING LOGICC ADVANCED IRS AVAIL IRS AVAILABLEA/BIRS ARM IRS ON GND IRS DECEL (L)(SH 2) INTFC IRS DECEL (R) SPOILERS WHEEL28V DC (SH 2) SPIN-UP A/S FAIL STOWED T/L L 28V(SH 2) ALL THROTTLE/ LVRS NOT ADV D T/L R 28V A/B FAILAUTO- THROT AIR/GND DISAGREESW ALL T/LNORM MANUAL BRK OFF AT IDLEAB ENABLE INTFCSPOILERS1 SPOILERSTOWED NORM BRK OFFSW INTFC HANDLERTO ARMING LOGIC GNDRTO SELECTED ALL T/L AT IDLE AIR-GND DISAGREE 2 RTO FAILON AIR/ GNDON GND NO. 1(SH 2) AIR INTFC GNDON GND NO. 2 SYS NO. 1 NOT ADVANCED
ON GND AIR/GND RELAY BRK OFF NORM MANUALOFF/DISARMAIR L METERED AUTOTHROTTLE OFF NO. 1RTO ARM BRKBRK OFF WHEELSPOILER HANDLEPRESS. SW (SH 2) A MICROSW PACKPRESS SPIN-UP ASSY SYS NO. 2SW POS SW R METERED AIR/GND RELAY BINTFCBRK OFF(A/B ARM LOGIC) WHEEL PRESS. SW (SH 2) RESET NO. 2SPIN-UPLATCH NO. 1NO. 2 WHEEL SPIN-UPNO. 5 ACTIVATE AVERAGE ANTISKIDWHEEL NO. 6 SPIN-UP ACTIVATEXDCRNO. 3 VELOCITY XDCRV AVE í 60K (V AVE) í 85 NO. 4 (8 PLACES) INTFC DEACTIVATENO. 8 NO. 7 V AVE < 30K 1 STOWING SPOILER HANDLE WILL DISARM AUTOBRAKES ONLY AFTER SPOILER DEPLOYMENT ON THE GROUND
SOFTWAREHARDWARE 2 RTO FAIL MONITORED AT TIME OF RTO ARMAUTOBRAKE CARD SUBSEQUENT RTO FAIL WILL NOT CAUSE SWITCH TO DISARM ANTISKID/AUTOBRAKE CONT UNIT
Autobrake Control SchematicFigure 15 (Sheet 1)
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T/L R 28V AUTOBRAKEPRESS. A/B DISAGREE SOLAUTOBRAKE CONT VLVINTFC C SOL VLVPRESS ,SW HYD AMPLIFIER A SERVO D/A VALVE DRIVER
PRESS. FDBK STAGEBRAKINGPOWER STAGE B A/B VLV ENABLE A/B APPLY C
ANTISKID/ AUTOBRAKE VLV C INTFC (SH 1) CONTROL UNIT 750 PSI P AUTOBRAKE SOL D
RTO APPLY VALVE PRESS SW1 2 3 MD&T AA DISARM 4 MAX OPEN CLOSE OFF A/B FAIL RATE DR COMPARE
DISAGREE 750AUTOBRAKE LT RTO 3 SEC PSI P DECEL RATE AUTOBRAKE SHUT-OFF (SH 1)
AUTOBRAKE PRESS. SW SEL SW (SH 1)
(R) A/B FAIL (SH 1) A/B FAIL (BITE)
AUTOBRAKE SOFTWARE SOL VLVHARDWAREAUTOBRAKE AUTOBRAKE (Y) VALVE MDL NORM www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 3
