DME Updating
When possible, only DME information is used from each radio to update the FMC position.

VOR/DME Updating
When required, both VOR and DME information is used to update the FMC position. The airplane must be 25 nm or less from the VOR/DME station.

LOC Updating
When required, localizer information is used to update the FMC. The ILS frequencies must be manually tuned when used as an approach aid; however, the FMC will auto–tune an ILS/DME station for use in DME updating. During an approach, the ILS localizer is used for cross–course position updating.

Updating Unavailable
The line title will be blank when the radio is not being used for updating.
Flight Management, Navigation -FMC Takeoff and Climb 737 Operations Manual

Agility Tuning
When required, a single radio can be automatically cyclic–tuned between two DME stations at five–second intervals. Two identifiers and frequencies are displayed for the single radio in use.
RTA Progress Page 2/3 (U4 and on)
RTA PROGRESS page is used to initiate the required time of arrival (RTA) mode. The RTA PROGRESS page provides advisory data on flight progress in the RTA mode and advises of control times such as recommended takeoff time to meet RTA.
Copyright . The Boeing Company. See title page for details.
11.41.16  December 1, 2000

Flight Management, Navigation -FMC Takeoff and Climb 737 Operations Manual

Required Time of Arrival Waypoint (RTA WPT)
Displays dashes when entry is allowed.
Copyright . The Boeing Company. See title page for details.
June 8, 2001  11.41.17
Flight Management, Navigation -FMC Takeoff and Climb 737 Operations Manual

LIMITS
Push – displays the PERF LIMITS page.

Prior RTA Waypoint (PRIOR RTA)
Prompt displayed when the RTA waypoint field contains dashes and a previous
RTA waypoint is still in the flight plan; otherwise blank.
Push – displays last active RTA waypoint data.

RTA Progress on Ground and In Flight

Copyright . The Boeing Company. See title page for details.
11.41.18  June 8, 2001

Flight Management, Navigation -FMC Takeoff and Climb 737 Operations Manual

Required Time of Arrival Waypoint (RTA WPT)
Waypoint entry must be in flight plan, or the CDU message NOT IN FLIGHT
PLAN will be displayed.
Entering a valid waypoint will generate a MOD RTA PROGRESS page and
illuminate the EXEC key.

Deletion of the RTA waypoint will create a MOD RTA PROGRESS page with all
data blanked and EXEC key illuminated. Execution will exit the RTA mode.

Deletion of the RTA waypoint does not remove the waypoint from the flight plan.
The RTA waypoint automatically clears, and the FMC exits the RTA mode after
sequencing the RTA waypoint out of the flight plan.

Recommended Takeoff Time (RECMD T/O)
Displays the recommended takeoff time to meet the planned RTA. Time is based on entered cost index.

Distance To RTA Waypoint (DIST – – – – TO XXXX)
Displays the distance (DIST) to the RTA waypoint.
Displays estimated time of arrival (ETA) to the RTA waypoint based on:

.
immediate takeoff

.
MIN/MAX speeds on PERF LIMITS page

.
entered forecast winds.

Takeoff Window (FIRST – – T/O WINDOW – – – LAST)
Displays earliest (FIRST) and latest (LAST) takeoff times to meet the planned
RTA.
Times are based on MIN/MAX speeds on the PERF LIMITS page.

Required Time of Arrival (RTA)
After RTA waypoint entry, initially displays current ETA based on the active flight
plan and performance parameters at the time of waypoint entry.
Desired RTA may be entered by overwriting displayed data.
Entry must be in one of the following forms:

.
XXXXXX (hr/min/sec)

.
XXXX (hr/min)

.
XXXX.X (hr/min/tenths of min). (U10) Entry of “A” after RTA specifies arrival time of at or after. (U10) Entry of “B” after RTA specifies arrival time of at or before.

Flight Management, Navigation -FMC Takeoff and Climb 737 Operations Manual

TIME ERROR
Displays the most recent time error in minutes and seconds up to a maximum of
59:59 minutes. Displays ON TIME if GMT is within current T/O WINDOW Displays EARLY or LATE as appropriate if GMT is not within current T/O
WINDOW.

Greenwich Mean Time (GMT)
Displays the actual GMT.

Required Time of Arrival Speed (RTA SPD)
Displays the target speed required to meet the planned RTA.
Same as speed displayed on RTA CLB, CRZ, or DES page.
Limited by MIN/MAX speeds on the PERF LIMITS page and any entered speed
　
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