737 Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
11.31.30 D6-27370-866-EGP
1 Cruise
Before the top of descent, FMC is in cruise mode and uses VNAV PTH and ECON
cruise speed.
2 Descent
After top of descent, FMC is in descent mode and VNAV changes to economy
descent speed and descends in VNAV PTH.
3 Speed Restriction Deceleration
Before the speed restriction altitude, VNAV decelerates to commanded speed
using VNAV PTH.
When at restricted speed, VNAV commands decreased pitch and descends in
VNAV PTH.
4 Altitude Restrictions
The VNAV path conforms to altitude restrictions at MNO, EPG, and the FAF. The
thrust mode changes to FMC SPD as required to maintain the target speed.
5 Approach
VNAV descends and starts approach in VNAV PTH at the commanded speed.
6 Missed Approach
When TOGA is pushed during approach, or when crossing the missed approach
point, VNAV disengages.
When selected during missed approach, VNAV engages in VNAV SPD.
7 Missed Approach Level Off
At missed approach altitude VNAV changes to VNAV PTH.
VNAV Speed Descent
A speed descent may be selected manually by selecting the SPEED prompt on the
PATH DES page. With no E/D specified, the speed descent is the only descent
mode available.
The speed descent maintains the target speed. Normally, the target speed is
economy above the airspeed restriction altitude and 240 knots below that altitude,
until deceleration is necessary for the approach. VNAV will not permit descent
below the altitude restriction until the airspeed is at or below the restricted value.
September 15, 2016
To Next Page
Loading...
