Thales FMGS, Pilot'S Manual

Page: 240 / 703

FLIGHT PHASES
28 DESCENT
6.8. CROSS REFERENCES
The following items may concern several flight phases.
TOO STEEP PATH AHEAD
"TOO STEEP PATH AHEAD" s-pad msg
(amber) is displayed if a too steep path
segment is detected in the computed
descent profile, and, NAV mode engaged
within 150 NM of destination.
The descent profile cannot be achieved
at idle thrust without extra drag.
On F-PLN page TOO STEEP PATH (F-PLN marker) shows the
corresponding leg.
This could happen in case of excessive vertical constraints between two
WPTs.
FROM THV001 {}
UTC SPD/ALT
ALESO 0855 / FL286
BIG3B BRG316° 8
TIGER 0900 293/ * FL154
----TOO STEEP PATH ----
BIG3B 1
D139L 0902 * 250/ * FL72
BIG3B 12 NM
BIG 0905 * 220/ * 4970
DEST UTC DIST EFOB
EGLL27R 0914 52 4.0
TOO STEEP PATH AHEAD £$
MORE DRAG
MORE DRAG message is
displayed on both PFD
(white) and MCDU (amber).
It means that descent profile cannot be achieved at idle thrust.
Additional drag is requested, such speed-brakes, to capture the path.
Conditions for display:
AP1
1FD2
A/THR
SPEED NAV
MDA
278
DES
ALT
− Speed is managed and, DES mode is engaged and, Flaps are not in
configuration full and,
− A/C is above descent path,
− FMGC computes that interception of theoretical descent altitude
profile is at less than 2 NM from the next ALT constraint (AT or AT or
BELOW),
− Vertical error is greater than the altitude constraint value - 500 feet.
CHECK APP SELECTION
If a NPA has been selected and an ILS/MLS is manually tuned, at less
than 100NM track distance from T/D, or, in DES or APPR phase,
"CHECK APPR SELECTION" message is triggered on both MCDU and
PFD.
Energy circle
See to Part II: Ch 7 – Approach.
J43126AA 00
© THALES AVIONICS S.A.
AIRBUS A318/319/320/321