OPERATIONS MANUAL

Automatic Flight
Takeoff Operation:
Preflight: F/D switches are set to ON. LNAV and VNAV are
armed. AFDS commands circa 8° pitch attitude (not for use
with autopilot).
Takeoff clearance: Pilot sets thrust levers to vertical position
and checks engine parameters on EICAS. If parameters are
normal, pilot pushes TO/GA switch which engages A/T in
THR REF mode. A/T moves throttles to takeoff thrust limit.
50 KIAS: TO/GA switch is inhibited until after liftoff.
65 KIAS: A/T changes to HOLD mode to allow manual
thrust control if necessary.
100 KIAS: FMC stores the current barometric altitude as
a runway elevation reference for later use re LNAV/VNAV
engagement, flap acceleration and thrust reduction.
Liftoff: AFDS starts commanding the
roll to maintain runway track, and the
pitch to maintain the airspeed that was
recorded when pitch passed 2°, +10 kt;
or V2+10 if that is greater.
If current airspeed remains above
target airspeed for 5 seconds: Target
airspeed is reset to current airspeed,
but not greater than V2+25.
In case of
engine failure:
Target airspeed
remains between
V2 and V2+10.
50 feet above runway elevation: Armed LNAV engages, and
FMC starts commanding the roll to follow active FMC route.
400 feet above runway elevation: Armed VNAV engages,
and A/T changes to THR REF mode.
Flap acceleration height: VNAV starts using a target speed
of V2+100, but not less than 250 kt; and not greater than flap
limit speed or airport speed restriction, whichever is lower.
Thrust reduction point: (Above, below, or at flap acceleration
height.) FMC activates armed climb thrust limit.
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