22-10-00
 ALL  ú ú 09 Page 11 ú Dec 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
Speed Mode
 1)  Pressing SPD switch/light initiates a speed mode request discrete. This discrete generates a speed mode select signal if the A/T is enabled and the airplane is airborne. The speed mode can also be generated by FLCH mode or VNAV mode disengagement.
 2)  The dot-bar matrix in the SPD switch/light lights when the MCP receives SPEED MODE OPER from the TMC. Once SPEED MODE is initiated, it can be disabled if the A/T is disabled, A/T retard engaged, or GA mode selected.
Flight Level Change Mode
 1)  Pressing the Flight Level Change (FLCH) mode switch/light initiates a flight level change discrete. This discrete generates a flight level change select signal if the FCC is engaged in CMD or the F/D is on. The FLCH select signal arms the flight level change mode.
 2)  The dot-bar matrix in the FLCH switch/light lights when the MCP receives FLIGHT LEVEL CHANGE OPER from the FCCs. FLIGHT LEVEL CHANGE OPER is also sent to the EFIS symbol generators for mode display on the EADIs. Once flight level change is engaged it can be disabled if the following modes are selected: ALT HOLD select, VS select, VNAV select, or GA select.
Lateral Navigation Mode
 1)  Pressing the Lateral Navigation (LNAV) mode select switch/light initiates an LNAV mode request discrete. This discrete generates an LNAV SELECT signal if the FCC is engaged in CMD or the F/D is on. The LNAV SELECT signal arms the LNAV mode. The LNAV mode can be manually disarmed by pressing the LNAV switch/light a second time.
 2)  The dot-bar matrix in the LNAV switch/light lights when the MCP receives LNAV OPER or LNAV ARM from the FCCs. The LNAV OPER signal is also sent to the EFIS symbol generators for mode display on the EADIs. Once LNAV mode is engaged, it can be disabled if the following modes are selected: HDG HLD select, HDG select, or GA select.
 3)  The same signal that lights the LNAV switch/light is provided, by the MCP, to the Flight Management System (FMS) to enable LNAV steering commands from the FMC (Ref 34-61-00).
Vertical Navigation Mode
 1)  Pressing the Vertical Navigation (VNAV) mode select switch/light initiates a VNAV mode request discrete. This discrete generates a VNAV SELECT signal if the FCC is engaged in CMD or the F/D is on. The VNAV SELECT signal arms the vertical navigation mode. The VNAV mode can be manually disarmed by pressing the VNAV switch/light a second time.
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 22-10-00
 ALL  ú ú 19 Page 12 ú Dec 20/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
 2)  The dot-bar matrix in the VNAV switch/light lights when the MCP receives VNAV OPER from the FCCs. The VNAV OPER signal is also sent to the EFIS symbol generators for mode display on the EADIs. Once VNAV MODE is engaged it will be disabled if the following modes are selected: ALT HLD select, V/S select, or FLCH select.
 3)  The same signal that lights the VNAV switch/light is provided, by the MCP, to the FMS to enable VNAV steering commands from the FMC (Ref 34-61-00).
Localizer Mode
 1)  Pressing the localizer (LOC) mode select switch/light initiates a localizer mode request discrete. This discrete generates a LOC MODE request signal if the FCC is engaged in CMD or the F/D is on. The LOC MODE signal arms the localizer mode. This signal can be manually disarmed by pressing the LOC mode switch/light a second time.
 2)  The dot-bar matrix in the LOC switch/light lights when the MCP receives LOC MODE ARM/OPER. LOC MODE OPER is also sent to the EFIS symbol generators for mode display on the EADIs. Once the localizer mode is engaged it can be disabled if the following modes are selected: HDG HLD select, HDG select, or LNAV select.
Approach Mode
 1)  Pressing the Approach (APP) mode select switch/light initiates an approach mode request discrete. This discrete generates an APP MODE request signal if the FCC is engaged in CMD or the F/D is on. The APPROACH MODE request signal arms the approach mode. This signal can be manually disarmed by pressing the APP switch/light a second time.
　
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