illuminates the EXEC light.

Execution allows early initiation of PATH descent at 1000 fpm until intercepting
the computed path.
Execution (U3 and U4) is the only way to initiate a SPD descent or (U5 and on)

allows early initiation of a SPD descent.

Descent Page (During Descent)
Display when any descent mode is active after beginning of descent.
Copyright . The Boeing Company. See title page for details.
11.43.4  June 8, 2001

Flight Management, Navigation -FMC Descent and Approach 737 Operations Manual

Vertical Deviation (VERT DEV)
Displays present deviation (feet HI or LO) from the computed vertical path.
The deviation is always in relation to the path descent profile, regardless of which
page is active (PATH DES or SPD DES).
Blank if a path is not available.

Altitude Restriction (AT XXXXX)
Displays the next waypoint constraint from the RTE LEGS page.

The constraint is speed/altitude. If an airspeed restriction exists at the waypoint, it
will be displayed in large font; otherwise the predicted speed will be displayed in
small font.

Can be deleted on this page.
The display is blank when no constraint exists, or for any PATH DES page if a path
descent is not available.

Flight Management, Navigation -FMC Descent and Approach 737 Operations Manual

To Waypoint (TO XXXXX)
Displays computed ETA and distance to go to T/D or, (U3 and U4) T/D ADVSRY
when not in an active descent mode.
If an early descent is in progress, initiated using (prior to U10) the CAPTURE or
(U10) the DES NOW prompt, ETA and distance to go to original T/D is displayed
until passing the T/D.

If a descent mode is active, displays ETA and distance to go to the first of the
following points:

.
the waypoint in the AT XXXXX line

.
an intermediate T/D (TO T/D – XXXXX, where XXXXX is the altitude).

The display is blank if a path descent is not available, or if the AT XXXXX line is blank and no T/D information is displayed.
(U3 and U4) The display is blank for all SPD DES pages unless T/D information is displayed.

Waypoint/Altitude (WPT/ALT)
Displays the waypoint and altitude that serves as the basis for the vertical bearing

(V/B) display on line 4R.
Normally displays the same waypoint/altitude restriction that is displayed on the
AT XXXXX line.

May be overwritten by pilot entry.
Dash prompts are displayed if there is no entry.

Vertical Path Parameters (FPA V/B V/S)
Displays the following parameters related to the present vertical path:
.  
FPA – actual flight path angle based on present ground speed and vertical
speed (that is, the present vertical bearing being flown)

.  
V/B – vertical bearing direct from present position on the WPT/ALT line
(that is, the flight path angle required if flying direct to the waypoint and
altitude on the WPT/ALT line)

.  
V/S – the required vertical speed (in fpm, based on present ground speed)
to fly the displayed V/B.

Blank if no entry on the WPT/ALT line.

SPEED
Displayed on PATH DES pages.
Push – selects the related SPD DES page.

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

Flight Management, Navigation -FMC Descent and Approach 737 Operations Manual

RTA
Displayed when CAPTURE/DES NOW or ERASE prompt is not displayed.
Push – selects the RTA PROGRESS page.

RTA Descent Page (U4 and on)
RTA Descent pages are displayed when an RTA mode is active. Displays are the
same as on other descent pages except as noted.

Target Speed (TGT SPD)
Displays computed RTA target speed.
Changes to FMC target speed if the RTA mode is exited.

TIME ERROR
Displays computed time error at the RTA waypoint. Same as time error line on RTA PROGRESS page.

RTA
Push – selects the RTA PROGRESS page.
Descent Forecast Page
The descent forecast page is used for pre–descent planning to enter forecast data for more precise descent path calculation.
Flight Management, Navigation -FMC Descent and Approach

737 Operations Manual
The primary entries are wind direction and speed for up to three descent altitudes, and the altitude that anti–icing is turned on and off.

Transition Level (TRANS LVL)
Normally displays FL180 as the assumed descent transition level.
Changes automatically if an arrival procedure having a different stored value is
　
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