procedure allows the pilot to program a direct to on the
vertical flight plan, while still flying the lateral waypoints
on the active flight plan. The VNAV direct to function
automatically deletes any intermediate constraints and
sets up a path descent to the vertical to waypoint using
the direct flight path angle.
1. D key Press. A Direct To page will
appear with the cursor over the
current TO waypoint.
2. Line select key Press to position
cursor over desired waypoint.
3. VNAV key Press. VNAV Waypoint
page will appear. If necessary,
position cursor over ALT field. If a
programmed, go to step 8.
4. ALT Insert or verify.
5. ENTER key Press. Cursor will
move to OFFSET fi eld.
6. OFFSET - If applicable, insert value in
nautical miles (-99 to +99 nautical mile
a. If offset is prior to the waypoint -
Enter range value and a () will
pre-fill as a default.
b. If offset is beyond waypoint -
Enter a (+) then range value.
7. ENTER key Press. Cursor moves to
Direct flight path angle pre-fills if it is
within the valid range.
8. Flight path angle Verify or insert (0.1
to 6.0 degree range).
waypoint entries and return to VNAV
(5) Creating VNAV Profile Waypoints. VNAV
profile waypoints (#TOC, #TOD, and #PRESL) are
used to provide a prediction of the position of the
aircraft on the vertical flight path. These are non-
enterable waypoints computed by the system based
on current groundspeed and vertical speed.
(a) Top Of Climb (#TOC). Top of climb
altitude is obtained from either the CRUISE ALT
entered by the pilot on the VNAV Data page, or from
the altitude pre-selector setting, if available. When the
aircraft arrives at the pre-selected altitude, the system
will automatically set cruise altitude to the pre-selected
altitude which will provide a #TOD prediction.
If vertical climb constraints are programmed,
#TOC will automatically appear as a waypoint when
the aircraft laterally passes the last vertical waypoint
that has a climb constraint. Once the aircraft has
crossed the final climb constraint waypoint, #TOC will
then become the vertical TO waypoint. If there are no
vertical constraints programmed for climb, #TOC will
be displayed as the first vertical waypoint as long as
the aircraft is in a climb.
reached, #TOC is removed from the VNAV flight plan,
and #TOD becomes the vertical TO waypoint.
(b) When #TOC is the TO Waypoint.
The pilot may obtain range and ETE to any altitude
above the aircraft during a climb.
1. VNAV key Press to display
VNAV page 1.
2. Line select key Press to display
VNAV page 1.
3. Alternate altitude Insert. This
value may be above or below the
altitude pre-select value, but must
be above the current barometric
4. ENTER key Press and observe
the change in RANGE and ETE.
5. Previous #TOC altitude setting -
Changing CRUISE ALT on the CDU to a
lower altitude should only be done after the
aircraft has departed cruise altitude, or
#TOD at the current cruise altitude will be
(c) Top Of Descent (#TOD). The top of
descent waypoint is the position where the aircraft will
intercept the descent path at the cruise altitude. The
system calculates the #TOD by establishing a valid
descent reference waypoint, then uses either the
CRUISE ALT entered by the pilot on the VNAV Data
page, or the altitude pre-selector setting, if available.