737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
11.31.32
MN-FLT-OH-201
•when a point to point (geometric path) leg is active, VNAV remains in
VNAV PTH
•while a vertical angle leg (GP x.xx on RTE LEGS page) is active,
VNAV remains in VNAV PTH
• if a vertical angle leg (GP x.xx on RTE LEGS page) becomes active,
VNAV switches to VNAV PTH without pilot action
• if on a vertical angle leg, and cross track exceeds two times the RNP
value, while LNAV is not engaged, VNAV will disengage.
VNAV will remain engaged at all flap settings, allowing approaches to be flown
using the vertical angle guidance. Speed for final approach can be set on the
APPROACH REF page.
If an ILS approach is flown in VNAV using vertical angle guidance, VNAV will
disconnect when passing the GS–XXX point if G/S is armed, but it can be
reengaged. If the GS–XXX point is deleted, VNAV will remain engaged
throughout the approach.
For an approach without a runway waypoint on the RTE LEGS page, the VNAV
path is calculated to the MDA or a calculated altitude at the missed approach
point. The calculated altitude may be below the MDA to ensure a flight path angle
and normal threshold crossing height.
Note:
It is the flight crew’s responsibility not to descend below the MDA until
adequate visual contact is achieved.
Integrated Approach Navigation (IAN)
1B785, 1B786, 1J585 - 1J594
Integrated Approach Navigation (IAN) provides the capability to fly most FMC
instrument approaches utilizing a procedure similar to that for ILS approaches. No
special aircrew action is required other than to line select a IAN compatible
approach into the FMC flight plan.
During an IAN approach, the FMC provides:
• glide path (G/P) deviations from the defined VNAV vertical path to the
missed approach waypoint
• glide path (G/P) is constructed on an angle that passes through the
altitude constraint at the missed approach waypoint, and is the steeper of
either the published angle, or the angle that clears the altitude constraint
at the waypoint prior to the missed approach waypoint
• final approach course (FAC) deviations from the defined LNAV lateral
path to the missed approach waypoint
• final approach course (FAC) only provides guidance to the runway if the
missed approach waypoint is located at the runway approach end
• a source for the deviation scales
• distance to the missed approach waypoint.
March 1, 2021