Alternate Dests Page X/X
The ALTERNATE DESTS pages 2 through 6 display specific information about alternate airports and the route used for diversion. All data on the page is related to the alternate airport displayed in the page title.
Two routes to the airport can be selected:
.
DIRECT–TO
.
MISSED APP The calculation of ETA and fuel remaining are based on the selected route.
Copyright . The Boeing Company. See title page for details.
11.43.36 June 1, 2005
Flight Management, Navigation -FMC Descent and Approach 737 Flight Crew Operations Manual
Alternate (ALTN)
Allows entry of alternate destination. Alternate and related information will also display on page 1/6.
VIA
Displays routing method used for alternate predictions.
Distance To Go (DTG)
Displays distance to go to alternate.
Manual entry allowed if DIRECT method is selected. Entered value will be
displayed in large font.
Estimated Time of Arrival (ETA)
Displays estimated time of arrival at alternate.
FUEL
Displays fuel remaining at alternate.
Missed Approach (MISSED APP)
Push – changes routing method to missed approach for alternate predictions.
INDEX
Push – displays ALTERNATE DESTS Page 1/X.
Trip Altitude (TRIP ALT)
Displays computed optimum cruise altitude..
Manual entry is allowed and will be displayed in large font. If manual entry is
unsuitable, display will show UNABLE.
ACTUAL WIND
Displays current wind direction and velocity..
If manual entry is made, heading will change to EST WIND.
Distance To Go (DTG)
Displays distance to go. Manual entry not allowed for missed approach routing.
DIRECT–TO
Push – changes routing method to direct to for alternate predictions.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -FMC Descent and Approach 737 Flight Crew Operations Manual
Destination–Alternate
Displays computed distance from destination to alternate when missed approach is selected. Distance includes missed approach procedure plus great circle distance from last waypoint in missed approach to alternate.
Manual entry is displayed in large font.
Holding
The FMC computes holding patterns with constant radius turns based on current winds and FMC commanded airspeed. The pattern size is limited to FAA or ICAO protected airspace. In LNAV, the AFDS tracks the holding pattern using up to a 30 degree bank angle. Strong winds or airspeed in excess of FAA or ICAO entry speeds may result in the airplane flying outside the protected airspace.
With LNAV active before sequencing the holding fix, holding pattern entries are determined by the following:
.
the angle between the flight plan leg into the holding fix and the holding
inbound course determines the entry method used (parallel, teardrop or
direct entry)
.
the airplane flies the initial outbound leg for a specified time (1.0 minute
at or below 14,000 feet and 1.5 minutes above 14,000 feet)
.
teardrop entries use an FMC calculated offset angle designed to intercept
the outbound leg at the point where the inbound turn begins
.
parallel and teardrop entries may cause the airplane to fly beyond the
displayed holding pattern; however, the airplane remains in protected
FAA or ICAO limits.
HOLD Page
The hold page is used to enter a holding pattern into the route.
When the flight plan does not have a holding pattern, push the HOLD function key to show the LEGS page with the HOLD AT line.
Two versions of the hold page are possible:
.
an airway or procedure holding pattern (from the navigation database)
.
a flight crew–entered holding pattern.
The holding page shows actual or default data about the holding pattern.
Entries make route modifications, which can be erased or executed.
Copyright . The Boeing Company. See title page for details.
11.43.38 June 1, 2005
Flight Management, Navigation -FMC Descent and Approach 737 Flight Crew Operations Manual
Active holding patterns are magenta on the navigation display.
Note: During FMC guided entrance to a hold, portions of the LNAV magenta holding pattern on the navigation display may not show. This may only occur when the holding pattern is within 5000 feet of the FMC computed MAX ALT, and after the UNABLE HOLD AIRSPACE scratchpad message shows. LNAV hold entry guidance will function normally.
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