GPS Status Display
Displays the GPS currently selected for use in navigation. “L” or “R” indicates left
or right GPS is being used in the FMC position calculation.
YA686, YA687, YC153 - YK104
“2” indicates dual system with both GPSs used in the FMC position calculation.
The display will be blank if GPS is inhibited for use in navigation.
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Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual
Navigation Options (NAV OPTIONS)
The FMC normally rejects the use of navaids that are not suitable for navigation. However, when the aircrew is aware that unreliable navaids exist (either by NOTAM, ATC, etc.) they should manually exclude these navaids from the FMCs navigation solution. This will prevent the possibility of incorrect position calculations and maximize the FMCs reliability. This is accomplished through the NAV OPTIONS page.
Access to the NAV OPTIONS page may be gained by selecting the NAV OPTIONS prompt on the REF NAV DATA page or by selecting NEXT or PREV PAGE on the NAV STATUS page.
DME/VOR INHIBIT
Enter the identifier of up to two VOR/DME, VORTAC, or DME stations that must not be used for FMC position updates.
Entries are blanked at flight completion.
Deleting or overwriting removes a previous inhibit. The FMC normally uses DME from two different ground stations to update its position solution. When two DME stations are not available, the FMC reverts to single station radial-DME updating to determine position. Only two of the four inhibit entries are utilized at any one time depending upon which update mode the FMC is operating in. The DME INHIBIT entries are excluded from the FMCs update solution whenever the FMC is updating from two DME stations. The VOR INHIBIT entries are excluded from the FMCs update solution whenever the FMC is radial-DME updating.
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Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual
DME/VOR/GPS UPDATE
Push – permits switching between ON and OFF modes for updating FMC
position. Default mode is ON. The current mode is highlighted.
Selection is reset to ON at flight completion.
Fix Information Page
Two identical FIX INFO pages are used to identify waypoint fixes for display on the navigation display map mode. If desired, fix information can be copied into the route. Page access is via the FIX key.
Radial or distance entries from the fix may be made on any line 2L to 4L. Valid format is a three character numeric entry. Slash rule is used to differentiate between radial and distance in the scratch pad.
FIX Name
Enter the desired fix.
YA721 - YA809
(SB changes YA613 - YA687, YC153 - YC413)
Valid entries are airports, navaids, and waypoints from the navigation database.
YD651 - YK104
(SB changes YA613 - YA687, YC153 - YC413)
Valid entries are airports, navaids, waypoints or runway identifiers from the
navigation database.
The selected fix is displayed on the navigation display map mode and highlighted
by a green circle.
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Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual
Distance Entry (example)
Enter a distance from the fix. Distances from the fix are displayed on the
navigation display map mode as a dashed green circle around the fix.
When the distance intersects the active route, the ETA, DTG, and predicted
altitude at the intersection are displayed for that intersection.
If there is more than one intersection, the data will apply to the first occurrence
and will sequence as each intersection is passed.
Valid entries are xxx.x:
.
distance is limited to 511 NM or less and may contain 1/10 NM entry
.
leading zeros can be omitted for distance
.
decimal values can be omitted
.
distance only entries must start with a /. ETA – displays the estimated time of arrival to the intersection point. DTG – displays the distance to go to the intersection point. ALT – displays the predicted altitude at the intersection point.
Radial Entry (example)
Enter a radial from the fix. Radials are displayed on the navigation display map
mode as green dashed lines from the fix.
When the radial intersects the active route, the ETA, DTG, and predicted altitude
at the intersection are displayed.
If there is more than one intersection, the data will apply to the first occurrence 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737NG机组操作手册Flight Crew Operations Manual FCOM 3(120)
