(e)
GUN 001-050, 052-999; The Fail Passive configuration has 2 or 3 channels hydraulically engaged in roll, pitch, and yaw, using two independent sources of data, and electrical and hydraulic power. The ASA shows LAND 2 (green).
(f)
GUN 051; The Fail Passive configuration has 2 or 3 channels hydraulically engaged in roll, pitch, and yaw, using two independent sources of data, and electrical and hydraulic power. The ASA shows AUTOLAND 2 (white).
(g)
Autoland configurations are not active until each FCC recognizes LOC and G/S capture; the airplane is below 1500 feet radio altitude; and other autoland logic requirements are met. Autoland configurations provide control for runway alignment, flare, landing, and rollout.
(8) Autoland Functional Sequence (Fig. 13)
(a)
The left (L) A/P is CMDENG (pitch and roll) on ILS approach. The LOC has been captured and the A/P is in ALT HOLD prior to glideslope intercept. The center (C) and right (R) FCCs supply captain's and F/O's F/D displays.
(b)
The APP mode enables multichannel engage (MCHENG). With the method 2 option active, the pilot must place the engage switches in CMD for the C and R A/Ps. This arms all A/Ps for MCHENG and makes the L FCC the first channel in CMD. The FMA on the EADI now displays roll and pitch ARM modes.
(c)
GUN 001-050, 052-999; multichannel engage occurs when all A/Ps have detected LOC and G/S capture and 1500 feet from a valid radio altimeter (RA). The first channel in command must receive acceptable CMDENG criteria from the other two FCCs. All A/Ps engage pitch, roll, and yaw channels. The ASA displays LAND 3 (Fail Operational) or LAND 2 (Fail Passive). All phases of autoland are possible with LAND 3 or LAND 2 displayed.
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757
MAINTENANCE MANUAL
AUTOLANDFOR FAIL-OPERATIONALREQUIREMENTS/CONDITIONS LEFT AUTOPILOT CENTER AUTOPILOT RIGHT AUTOPILOT
FUNCTIONSROLL CHANNEL FUNCTIONSPITCH CHANNEL YAW CHANNELFUNCTIONS ROLL CHANNELFUNCTIONS PITCH CHANNELFUNCTIONS YAW CHANNELFUNCTIONS ROLL CHANNELFUNCTIONS PITCH CHANNELFUNCTIONS YAW CHANNELFUNCTIONS
1F/O F/D ON USING RFCCCAPT F/D ON USING CFCCGS ENG.HR>1500.ALT HOLD.L A/P CMDENG . LOC CAPT .______ CONTROLSLEFT A/PLATERAL CONTROLSERVO FORLOCALIZERTRACKING CONTROLS LEFTA/P PITCHALT HOLDSERVO FOR BARO POSITIONTO RUDDERSYNCHRONIZING SUPPLIES F/DCMDS FORLOCALIZERTRACKINGA/P CH SYNCSTO AIL POSN. ALT HOLDF/D CMDS FORPOSN. SUPPLIESA/P CH SYNCSTO ELEVATOR POSITIONSYNCS TORUDDER AS FORCENTERA/P AS FORCENTERA/P AS FORCENTERA/P
2 APP SWITCH (METHOD 2 OPTION)AS ABOVE, PILOT PRESSES BUT ALSO IS MULTI-CHANNEL ARMAS ABOVE - L FCC REMAINS CMDENG 2 AS ABOVE - PILOT PRESSES CMD SWITCH,CENTER A/P BECOMES MULTI-CHANNEL ARM 2 RIGHT A/P BECOMES MULTI-CHANNEL ARMAS ABOVE - PILOT PRESSES CMD SWITCH,
AND ALT HOLD.AS ABOVE, BUT NOW GSENG________ AS ABOVE CONTROLS LEFTA/P PITCHSERVO FORGLIDESLOPECAPTURE & TRACK AS ABOVE AS ABOVE TRACKG/S CAPT &F/D CMDS FORA/P CH SYNCS AS ABOVE AS ABOVE AS FOR CENTERA/P AS ABOVE
ROLL & YAW CH ENTER ROLLOUT ARMPITCH CH ENTERS FLARE ARM.ALL VALID A/PS ARE MCHENG.AS ABOVE, BUT HR < 1500FT.ASA SHOWS LAND 3 (GREEN) ARM MODEENTER ROLLOUTALIGNMENT.RUNWAYBANK CMD FORPLUS LIMITEDAS ABOVE, CMDAS FIRST INFOLLOWS C FCCTROL OF AUTOSTAB TRIM.MAINS IN CON-CHANGES. RE-CONFIGURATIONSPEED ANDING APPROACHATTITUDE DUR-ADJUSTS PITCHARM MODE.AS ABOVE,ENTERS FLARE LINELOC CENTER-NOT MAINTAINIF BANK CAN-PROVIDING YAWALIGNMEMT,DURING RUNWAYCONTROLSA/P ROLLOUTGUIDANCE SERVO ENGAGES TOCONTROL CENTERREFERENCESIN ROLLOUT ARMCMDS DISABLEDA/P LATERALCONTROL SERVO,USING CENTERA/P APPROACHMODE. F/D DISCONNECTSIF RIGHT A/PTRIM CONTROLFOR AUTO STABFIRST IN CMDRIGHT FCC ASABLED. FOLLOWSF/D CMDS DIS-FLARE ARM MODE.ERENCES INAPPROACH REF-CONTROL CENTERENGAGES TOSERVO, USINGA/P PITCH CONTROL CENTERENGAGES TOA/P ROLLOUTGUIDANCE SERVODURING ROLLOUTARM MODE ENGAGES TOCONTROL RIGHTAPPROACH REF-ERENCES INROLLOUT ARMDISABLEDA/P LATERALCONTROL SERVOUSING RIGHT A/PMODE. F/D CMDS ENGAGES TOCONTROL RIGHTDISCONNECTSPITCH SERVO,USING RIGHT A/PREFERENCES INCMD FOR STABTRIM CONTROL,IF LEFT A/P ENGAGES TOCONTROL RIGHTDURING ROLLOUTA/P ROLLOUTGUIDANCE SERVOARM MODE
AND GSENG.PITCH CH ENTERS FLARE ENGAGEAS ABOVE, BUT WHEN HR<50FT_____ TITUDE REDUCESDUCE AS ALT-COMMANDS RE-AS ABOVE,BUT AILERON HOLD APPROX.RUNWAY THRES-1400 FT FROMTARGET ISDOWN. TD POINTSEC AT TOUCH-RATE TO 2 FT/DUCE DESCENTCONTROLS PITCHATTITUDE TO RE- AS ABOVE
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