PRESS B/CRS SWITCH EFFECTIVE ONLY AFTER BCRS LOC CAPTURE COURSE BACK
ROLL AXIS COMMANDS BCRS LOC CENTERLINE HOLD MODE
PITCH AXIS COMMANDS BCRS GLIDESLOPE CENTERLINE HOLD IF BCRS GLIDESLOPE IS AVAILABLE, OTHERWISE SELECTED VERTICAL SPEED
TURN ON F/D ON GROUND
AUTOMATICALLY ACQUIRED AT CMD ENG IF ROLL ATTITUDE EXCEEDS HDG HOLD CRITERIA
APPROACHES WINGS LEVEL LATERAL COMMAND ENGAGE OPTION MANUALLY SELECTABLE ON MCP
LATERAL COMMAND ENGAGE OPTION
WINGS
LEVEL
MODE
MANUALLY SELECTABLE ON MCP HEADING BANK ANGLE LIMITS SELECTABLE SELECT ON MCP MODE SYNCHRONIZING SERVO COMMANDS ONLY TO UNPRESSURIZED A/P SERVOS NO AUTOPILOT ENGAGED AND BOTH FLIGHT DIRECTORS OFF FCC SIGNAL PATHS SYNCHRONIZE TO REFERENCES CONDUCTS SYSTEM FAILURE DETECTION MONITORING TO DETERMINE PERMISSIBLE ACTIVE MODES FOR ENGAGEMENT NO AUTOPILOT YAW AXIS CONTROL PITCH AXIS CONTROLS ROTATION ATTITUDE OR SPEED SCHEDULE ROLL AXIS COMMANDS WINGS LEVEL UNTIL LIFTOFF, THEN GROUND TRACK HOLD
COMMANDS ROLL TO WINGS LEVEL AND AUTOMATIC TRANSITION INTO HDG HOLD
BASIC ROLL AXIS MODE COMMANDS TO HOLD HEADING REFERENCE
COMMANDS TO HOLD BANK ANGLE AT SELECTION
COMMANDS TO ACQUIRE AND HOLD MCP SELECTED HEADING
LATERAL RESPONDS TO LATERAL STEERING COMMANDS FROM FLIGHTMANUALLY SELECTABLE OM MCP NAVIGATION MANAGEMENT SYSTEM MODE
LOCALIZER COMMANDS TO ACQUIRE AND TRACK LOCALIZERMANUALLY SELECTABLE ON MCP ACTIVE CENTERLINE AFTER LOC CAPTURE MODE
BACKCOURSE COMMANDS TO ACQUIRE AND TRACK BACKCOURSELOCALIZERMANUALLY SELECTABLE ON MCP
LOCALIZER CENTERLINE
SIMULTANEOUS PITCH AND ROLL MODES.
GUN 001-050,052-999
GUN 051
Command Roll Modes
Figure 7
D00373
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757 MAINTENANCE MANUAL
GUN 051;
Lateral Command Engage Option (LCEO)
1) The lateral command engage option (LCEO) is selected by grounding a dedicated pin on the FCC. The baseline configuration is LCEO inoperative (pin ungrounded). In this configuration, the A/P engages into HDG HLD mode at CMDENG regardless of the bank angle (B/A). With LCEO operative (pin grounded) the A/P engages into HDG HOLD if the B/A is equal to or less than 5 degrees, and into Roll Attitude Hold if the B/A is greater than 5 degrees.
Autopilot Mode Engage Option (APMEO)
1) The APMEO is enabled by grounding a dedicated pin on the FCC. The baseline configuration is APMEO enabled. This option causes the A/P to couple smoothly into the path command modes being used by the F/D when the A/P engages in CMD (except during takeoff or go-around). The G/S ACTIVE, LOC ACTIVE, and G/A modes transition to V/S and HDG HLD modes and rearm the G/S and LOC if they were armed or active before A/P CMD ENGAGE.
Heading Hold
1) Heading hold is the basic roll axis mode. It is automatically selected when the F/D only mode is initially chosen or when any A/P channel is engaged in single-channel CMD (both F/D off). Heading hold can also be manually selected by pressing the HOLD switch/light on the MCP.
Attitude Hold
1) Attitude hold is in operation when the AFDS is initially engaged, the LCEO is operative and the B/A is greater than 5 degrees. If the autopilot is engaged, or the flight director is on, with the B/A greater than 30 degrees, the A/P rolls the airplane back to 30 degrees and holds that attitude.
2) AIRPLANES WITH CONTROL WHEEL STEERING; attitude hold is the basic CWS mode when no wheel force is applied and the B/A at engagement is greater than heading hold capture criteria.
Heading Select Mode
1) GUN 001-050, 052-999; heading select mode acquires and maintains the heading selected on the MCP. It has 6 selectable bank angle limits: AUTO and 5°-25° in 5 degree steps. The AUTO B/A limit varies from 15 to 25 degrees as a function of true airspeed and heading error. The heading select mode can be manually called by pushing the HDG SEL switch on the MCP.
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