Boeing 787-8 - MCP Speed Intervention

787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 11.31.23
Flight crew entry of a step altitude on the CRZ or RTE LEGS page overrides the
FMC step climb predictions for the next predicted step. Once a step climb to that
altitude is predicted, the FMC resumes normal step altitude prediction. Entry of a
planned step altitude on the RTE LEGS page overrides a “Step To” entry made on
the CRZ page.
Predicted step altitudes display on the RTE LEGS page. The distance and ETA to
the next step point (predicted or flight crew entered) display on the CRZ and
Progress pages. They also display on the ND map display with a green circle and
S/C label.
Cruise Descent
Setting an altitude below the current cruise altitude in the MCP altitude window
and pushing the altitude selector (more than 50 NM from a T/D) causes the cruise
altitude to be set to the MCP altitude and the airplane to descend to the new cruise
altitude. The CRZ page displays ACT ECON CRZ DES. If the altitude set in the
altitude window is below the speed transition (SPD TRANS) or restriction (SPD
RESTR) altitude displayed on the DES page, those altitudes and speeds are
deleted. Transition or speed restrictions must be maintained by flight crew action.
MCP Speed Intervention
With VNAV active, pushing the IAS MACH selector enables speed intervention.
Speed intervention allows the flight crew to change airplane speed with the
IAS/MACH selector.
The above illustration shows the VNAV pitch flight mode annunciation for each
phase of flight when using speed intervention.
In a VNAV descent after the T/D, the pitch mode does not change with speed
intervention and remains in VNAV PTH throughout the descent. Pitch controls
speed in VNAV SPD mode, and thrust controls speed in VNAV PTH mode.
V
N
A
V
S
P
D
CRZ
D
E
S
A
P
P
R
C
L
B
VNAV PTH
V
N
A
V
P
T
H
Altitude
VNAV PTH
Restriction
V
N
A
V
P
T
H
V
N
A
V
S
P
D
C
L
B
Altitude
VNAV PTH
Restriction
D
E
S
V
N
A
V
P
T
H
o
T/D
SPEED INTERVENTION PITCH MODES
August 14, 2009