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path angle and normal threshold crossing height.
Note: It is the flight crew’s responsibility not to descend below theMDA until
adequate visual contact is achieved.
VNAV provides pitch guidance through the descent to the MDA. The autothrottle
controls airspeed to the active FMC speed.
• idle thrust
• speedbrakes retracted
• descent wind speed decreasing
with decreasing altitude
• applicable target speed
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.31.24 D6-30151-425
Flight Management, Navigation -
Flight Management System
Operation
Go-Around
Pushing a TO/GA switch activates go-around and deletes altitude constraints
through the end of descent. VNAV may be selected to complete the climb to
missed approach altitude.
October 1, 2000
747 Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.31.25
Cruise and Descent Profile (Nonprecision Approach)
T/D
50'
ABOVE 4000'
CROSS
EPG
CONSTRAINT
WAYPOINT
10,000'
FAF
ALTITUDE
MISSED APP
AND 170 KTS
FAF ALT
CROSS AT
E/D
EPG FAF
1
2
3
4
5
6
7
VNAV PTH
VNAV PTH
VNAV PTH
VNAV PTH
VNAV SPD
VNAV PTH
Level deceleration
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.31.26 D6-30151-425
Flight Management, Navigation -
Flight Management System
Operation
1 Cruise
Before top of descent, FMC is in cruise and commands VNAVPATH and ECON
cruise speed.
2 Level deceleration phase
At top of descent, FMC transitions to descent and commands the airspeed to
ECON descent speed and maintains altitude in VNAV PATH.
3 Descent
Nearing descent speed, VNAV commands a descent in VNAV PATH at ECON
descent speed.
4 Descent deceleration phase
Before the speed restriction altitude, FMC commands the target descent airspeed.
The pitch mode remains VNAV PTH and the descent rate approximates 500 feet
per minute.
5 Descent and Approach
When at target speed, VNAV commands a descent and starts approach in VNAV
PATH at commanded speed.
6 Missed Approach
When selected during missed approach, VNAV activates in VNAV SPD.
7 Missed Approach Level Off
At missed approach altitude, VNAV SPD changes to VNAV PATH.
October 1, 2000
747 Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.31.27
Takeoff and Climb (Engine Out)
1 Takeoff
Condition: before a sensed engine failure and aboveVNAV activation altitude.
VNAV active (400ft)
ENG OUT>
400 FT
FL250
CRZ ALT
SEL SPD
250
<ALL ENG ENG OUT>
ACT VREF + 100 CLB
223
FL250
EO SPD
CRZ ALT
ALL ENG>
ACT EO CLB
Sensed engine failure
Note: VNAV page title will be
LIM SPD CLB until flaps
are retracted
V2 + 10 to V2 + 25
FMC maintains takeoff thrust
and speed V2 + 10
EO acceleration height or first
movement of flap handle
At VREF + 98, automatic
change from takeoff reference
thrust limit to continuous (CON)
thrust limit
Select and execute
ENG OUT
1
2
4
5
3
MAX ALT
FL 230
272/10000
SPD TRANS
October 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.31.28 D6-30151-425
Flight Management, Navigation -
Flight Management System
Operation
Result: VNAV SPD commands a climb at V2+10 to V2+25 knots. Autothrottle
mode is THR REF and the reference thrust limit is takeoff.
2 Sensed Engine Failure
Condition: after VNAV active, engine failure sensed, airplane below engine out
acceleration height, and below the thrust reduction point entered on the TAKEOFF
REF page.
Result: VNAV remains in VNAV SPD and commands a speed of V2 + 10.
Autothrottle remains in THR REF at the selected reference thrust limit for takeoff.
3 Acceleration Height
Condition: at acceleration height or flap retraction has started.
Result: VNAV commands an acceleration to VREF + 100 limited by airplane
configuration (flap placard). The VNAV climb page shows theACT VREF + 100
　
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