.
Verification of top of descent point.
.
Control of aircraft descent profile.
.
Use of PROG Page.
.
Use of PERF Page.
.
Approach planning.
SECONDARY
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Use of FMGS constraints for approach planning.
.
Knowledge of descent/deceleration performance.
A319/A320/A321 FLIGHT CREW TRAINING MANUAL NORMAL OPERATION BRIEFINGS PERFORMANCE 1.02.33 Page 11
REV 21 MAY 98
05 - TRAINEES’ ACTIONS
CLIMB
In the managed climb, the aircraft climbs with thrust levers set at the climb gate, producing climb thrust, maintaining a speed/Mach number computed dependant on the cost index. The higher the cost index, the higher the speed. Speed control is via elevator and will give varying rates of climb to maintain a set speed. A similar situation is true in OPEN CLB. Selected speed may be used to increase/decrease climb rate, with thrust remaining at climb power.
Be careful when leaving an altitude and selecting climb, that you allow the aircraft to begin climbing with climb power before selecting a lower speed than target, or the aircraft may reduce power initially to follow speed rather then beginning the climb. At all times, the aircraft will try to maintain speed, thus if a lower speed is selected too quickly, thrust will be reduced to achieve this. EXPEDITE (A320 only) is useful here, though take care not to remain in EXPEDITE mode too long, as the target speed is green dot, and accelerating from green dot to cruise speed at altitude takes a long time.
If a set rate of climb is required, V/S mode may be used. Be very careful to watch the speed if high rates of climb are selected. Thrust will vary to maintain the speed and V/S. However, if V/S is too great, speed will begin to decay, and care must be taken not to end up in a slow speed, low energy situation. If a low V/S is specified, thrust will vary to maintain both climb rate and the chosen speed.
On the ND, the top of climb point is displayed and can be monitored to comply with ATC or other requirements. This point will be the level off point of the current selected altitude. The FMGS however, will always give the top of climb point of the altitude specified in the F-PLAN (shown on PROG page). Also useful is the PERF page, which will give predictions to the selected altitude.
DESCENT
The descent may be in OPEN DES mode, managed DES mode or V/S.
In DES mode, the aircraft will calculate an ideal profile and will try to fly it. Its progress can be monitored on the PROG and PERF pages. Speed varies to match the required descent path.
In OPEN DES, the thrust is at idle and a set speed is flown. Again, progress can be
monitored on both PROG and PERF pages.
In EXP DES (A320 only), the thrust is idle and the speed target is just short of Vmo/Mmo.
Very high rates of descent can be achieved and careful monitoring is vital.
Mentally checking that the aircraft will arrive at its descent windows is useful so that the
approach is not rushed, nor fuel burned needlessly.
A319/A320/A321 FLIGHT CREW TRAINING MANUAL NORMAL OPERATION BRIEFINGS PERFORMANCE 1.02.33 Page 12
REV 21 MAY 98
06 - COMPLETION STANDARDS
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Has sound knowledge of aircraft performance.
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Demonstrates understanding of FMGS capabilities and limitations.
07 - COMMON ERRORS
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No cross check of descent profile.
.
No anticipation of possible navigation changes (Dir to, Hdg...)
A319/A320/A321 FLIGHT CREW TRAINING MANUAL NORMAL OPERATION BRIEFINGS PERFORMANCE 1.02.33 Page 13
REV 21 MAY 98
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