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Flight Management, Navigation -Flight Management System
Operation
737 Flight Crew Operations Manual
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.
YA721, YA722 If an ILS approach is flown in VNAV using vertical angle guidance, VNAV will disconnect when passing the GS–XXX point, but it can be reengaged. If the GS–XXX point is deleted, VNAV will remain engaged throughout the approach.
YA613 - YA687, YA801 - YK104 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.
Go-Around
Below 2000 feet radio altitude, a go-around can be initiated by any of the following methods:
.
pushing either TO/GA switch while in a descent
.
executing a direct-to waypoint in the missed approach (other than the
missed approach point)
.
automatically while in a descent and the last waypoint of the approach
cycles to the first waypoint of the missed approach.
Once the go-around is initiated:
.
the FMC transitions from active descent to active climb
.
the thrust limit changes to go-around thrust
.
all descent altitude constraints below the current airplane altitude are
deleted and replaced with predicted altitudes
.
the original destination airport (airport from which the go-around was just
initiated) becomes the new origin airport allowing SID selection if a
diversion to another airport is required.
Note: LNAV may be engaged when the airplane climbs above 400 feet radio altitude, but VNAV should not be engaged until after flap retraction.
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Flight Management, Navigation -Flight Management System Operation
737 Flight Crew Operations Manual
If the go-around was initiated by pushing a TO/GA switch or selection of go-around thrust, the CRZ ALT will change to the highest of:
.
the highest constraint in the missed approach
.
1500 feet above airport elevation
.
the MCP altitude.
Note: If the MCP altitude is the lowest of the three, the autopilot, if engaged, will level off at the MCP altitude.
If the go-around was initiated by direct-to or waypoint sequencing, the CRZ ALT will change to the highest of:
.
the highest constraint in the missed approach
.
1500 feet above airport elevation.
Refer to section NP20.xx, Go-Around Procedure and section 4.20, Go-Around for additional information.
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Flight Management, Navigation -Flight Management System Operation 737 Flight Crew Operations Manual
VNAV Cruise (Engine Out Above Eng Out Max Alt)
YA721, YA722
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Flight Management, Navigation -Flight Management System Operation
737 Flight Crew Operations Manual
YA613 - YA687, YA801 - YK104
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Flight Management, Navigation -Flight Management System Operation 737 Flight Crew Operations Manual
Engine Out Modification
Select the ENG OUT prompt on the CRZ page. The ENG OUT page displays the appropriate engine out driftdown performance data to enable the airplane to descend to the engine out maximum altitude. Refer to FMC Cruise, section 11.42 for a complete description of the ENG OUT CRZ page.
Drift Down Execution
After selecting the left or right ENG OUT mode, perform the driftdown as follows:
.
disconnect A/T
.
set maximum continuous thrust on operating engine (N1 line)
YA721, YA722
.
set MCP speed to TGT SPD
YA613 - YA687, YA801 - YK104
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