Vertical Navigation Constraints

1
Vertical Navigation Constraints

• Dont over constrain the CNI-MU. With minimum
  constraints, the box should update changes in
  about 15 seconds. Obviously, the more
  constraints, the longer this time will be
  affecting time control decision making.
  Constraints should also match what was planned
  with PFPS.
• C- defines a start of climb SOC (via ding, ding,
  RES ALT SEL? CNI-MU advisory) or a bottom of
  descent (via pseudo waypoint (TOD) as well as RES
  ALT SEL? as a CNI-MU advisory).
• D-defines a top of descent (at the WPT) and a
  pseudo waypoint BOD. It is considered a speed
  descent using 4.7 to calculate BOD.
• Climbs and descents are further defines in PERF
  CLIMB or DESCENT pages. If intending to
  climb/descend at 210KIAS, ensure that these pages
  reflect as such. For descents at 210 KIAS and
  1000 fpm, use 1.5 degrees for descent angle.
• The CNI-MU changes vertical nav modes (i.e.
  CRUISE, CLIMB, DESCEND) when altitude changes by
  2150 feet. Monitor TIME NAV page to ensure you
  are in the proper mode otherwise time accuracy
  may be greatly impaired.

2
SKE EXAMPLE (BJ 20 LEGS PAGES)

• LRF - no constraints set up PERF CRUISE to 3000
  feet and 180 KIAS for initial climb to W8DME
  cruise winds will not effect time control from
  initial takeoff until in cruise mode.
• W8DME / 6000C
• BENIT 210 / 6000C (needs C to tie Speed)
• S20B
• S20C -
• S20D - / 3500C
• S20G-

• IP086- / 2000C
• BJDZ- constraints come from CARP NOTE Speed,
  Altitude and Winds (from double pumping
  altitude winds) will remain in PERF CRUISE unless
  overridden via another constraint.
• ESC - 180 / 3000 C
• TRBJ1
• TRBJ2- / 2000C
• TYVNB 135 /

Note Crews should avoid entering TOD and BOD
vertical commands at adjacent waypoints unless a
cruise segment is ensured to occur between the
two descents. When flying TOD and BOD vertical
commands at adjacent waypoints, crews should
monitor the NAV flight plan display to ensure TOD
and BOD waypoints do not cross.
S20B
RESET ALT SEL?
RESET ALT SEL?
RESET ALT SEL?
LRF Set PRF CRUISE to 180 knots and 3000 feet
or as cleared.
3
Visual Routes

• Set up the W8DME and departure the same as SKE
  (PERF CRUISE 180 and 3000). Then constrain only
  BEGEE with 210 knots. The other option to get a
  more accurate take off time is to use the average
  speed and altitude for which the route will be
  flown.
• The only other constraint generally needed for
  visual routes is on the escape point. Without
  this, the box still thinks that you will be
  flying drop altitude and airspeed with drop
  winds.
• Once entered in the visual low level environment,
  keeping the PERF CRUISE page tight (with current
  altitude and airspeed) will make time control
  easier and more precise. For pacing purposes,
  accomplish this after each turn point.