737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
MN-FLT-OH-201
11.31.29
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 TO/GA 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.
Vertical Angle
A vertical angle can be assigned to a waypoint from the navigation database. This
vertical angle defines a VNAV path between the waypoint and the waypoint
preceeding it. This feature can be available in approaches, approach transitions,
and STARs. For example, the vertical angle for the glideslope of an ILS approach
would typically be 3 degrees. This angle is displayed on the ACT RTE LEGS page
above the speed/altitude line for the associated waypoint. Vertical angles may be
expected in any approach ending at RWXXX or MAXXX. The E/D will be
RWXXX or MAXXX, and the E/D altitude will be either threshold crossing
height (TCH – typically 50 feet above the touchdown zone elevation) or the
altitude specified at MAXXX.
March 1, 2021
