here they all are
5414
4
MCP/FCU Buttons B32-63 (Read/Write)
AP1 Bit0
AP2 Bit1
---- Bit2-Bit3 (free)
AP3 Bit4
FDON Bit5 (switch on) Captain
FDFF Bit6 (switch off) Captain
---- Bit7 (free)
APDI Bit8 (AP Disengage - not used in 747-400 and 777MCP) <--- 737
APEN Bit9 (AP Engage - not used in 747-400 and 777 MCP) <--- 737
APOF Bit10 (AP Disconnect, discreet OFF for 747-400 and 777 MCP)
VS Bit11 (same as Bit31 previous offset)
--- Bit12-Bit15 (free)
ALS Bit16 (AB LS Button First Officer)
ALS Bit17 (AB LS Button Captain)
ASTI Bit18 (AB STD/QNH push)
ASTO Bit19 (AB STD/QNH pull -> STD BARO 29.92 in)
ASPI Bit20 (AB Speed Button push - managed speed mode)
ASPO Bit21 (AB Speed Button pull)
AHDI Bit22 (AB Heading Button push - managed heading mode)
AHDO Bit23 (AB Heading Button pull)
AALI Bit24 (AB Altitude Button push - managed altitude mode)
AALO Bit25 (AB Altitude Button pull)
AVSI Bit26 (AB VS Button push - managed altitude mode)
AVSO Bit27 (AB VS Button pull)
AEXP Bit28 (AB EXPED Button)
ATFP Bit29 (AB TRKFPA Button)
---- B31 (free)
gr.
Frans M