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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757
MAINTENANCE MANUAL
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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MAINTENANCE MANUAL
T/L L 28V
(SH 1)
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
A/B
DISAGREE CONT
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)
CONT VALVE
IRS DECEL
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
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本文链接地址：757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 3
