IAS/M (push): IAS/M hold mode.
IAS/M (pull): IAS/M Select mode.
HDG (push): Heading Hold mode.
HDG (pull): Heading Select mode.
ALT (push): Altitude Hold mode.
ALT (pull): LVLCH mode (AFCAS), or releases selected altitude to PROF (FMS).
AFCAS: What are the push/pull functions of the FMP controls?
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