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NORMAL OPERATION BRIEFINGS
PERFORMANCE
CHAP02\33
APPROACH SPEEDS (CONT’D)
05 - TRAINEES’ ACTIONS (CONT’D)
GROUND SPEED MINI FUNCTION
This function will compute a target IAS on approach in order to maintain a minimum aircraft
energy level. The minimum energy level is an FMGS computed minimum ground speed
(GS mini). This GS mini is not displayed to the crew but is used by the FMGS to calculate
the IAS target on approach with managed speed. The relationship between VAPP, GS mini
and approach IAS target is shown below.
VAPP = calculated in the manner described above and displayed or
overwritten on MCDU PERF APPR page.
GS mini = VAPP - Tower headwind component
The headwind is counted as a positive value with a minimum value of 10 kt. For example if
the headwind is less than 10 kt or there is a tailwind GS mini = VAPP -10 kt
IAS target = Maximum of VAPP or GS mini + Current Headwind Component
Current Headwind is counted positively and tailwind negatively.
The following extreme example should demonstrate how this function affects target speed :
- Approach to Runway 15R
- Tower wind in PERF APPR page : 150/45
- VLS = 130 kt
From the first two formulae above we get the following speeds :
- VAPP = 140kt (130 kt + maximum of 5 kt or 1/3 of 30 kt)
- GS mini = 110 kt (140 kt - 30 kt)
Altitude Current wind GS mini VAPP IAS target
1500 ft 150°/60 kt 110 kt 140 kt 170 kt
1000 ft 330°/10 kt 110 kt 140 kt 140 kt
500 ft 150°/60 kt 110 kt 140 kt 160 kt
Runway 150°/30 kt 110 kt 140 kt 140 kt
The effect of this GS mini function as far as the pilot is concerned is that the IAS target (with
managed speed) will vary, sometimes considerably, on approach depending on the actual
wind. It is recommended that all normal approaches be flown using managed speed to take
advantage of this function. When there are large variations in IAS target the use of A/THR
will allow accurate speed control. In certain circumstances the IAS target may be greater
than the CONF FULL limiting IAS of 177 kt, in which case it will be necessary to use selected
speed so that CONF FULL can be used.
A319/A320/A321
FLIGHT CREW TRAINING MANUAL
1.02.33 Page 5
REV 21 MAY 98
NORMAL OPERATION BRIEFINGS
PERFORMANCE
CHAP02\33
APPROACH SPEEDS (END)
05 - TRAINEES’ ACTIONS (END)
ABNORMAL CONFIGURATION
When carrying out an approach in any abnormal configuration it is recommended that
selected speed is used. The approach should be flown using the configuration shown on
ECAM and with the PERF APPR page CONF FULL prompt pushed. Approaches in
abnormal or emergency configuration should be carried out in selected speed.
VAPP = VREF + CONF CORRECTION + WIND CORRECTION
NOTES :
· VREF is VREF FULL from MCDU PERF page or QRH
· CONF CORRECTION is determined from QRH 2.21
· WIND CORRECTION is 1/3 headwind component
· If CONF CORRECTION is 20 kt or greater do not apply WIND CORRECTION
· If CONF CORRECTION is less than 20 kt then CONF CORRECTION + WIND
CORRECTION should be limited to 20 kt.
See QRH 2.22 (Abnormal Procedures) for how to determine approach speed when there are
multiple failures.
Remember, use selected speed in abnormal or emergency configurations.
Landing distance increments are necessary because of increased approach speeds, braking
malfunctions or unserviceability of some ground spoilers. The increments to be used and
how to apply them are detailed in QRH 2.23 and 2.24.
06 - COMPLETION STANDARDS
· Correctly calculates approach speed
· Understands logic of Mini ground speed function
· Correctly applies landing distance increments when required.
07 - COMMON ERRORS
· Confusion over wind correction
· Not using selected speed when appropriate
A319/A320/A321
FLIGHT CREW TRAINING MANUAL
1.02.33 Page 6
REV 21 MAY 98
NORMAL OPERATION BRIEFINGS
PERFORMANCE
CHAP02\33
CONTAMINATED RUNWAYS
01 - TRAINING OBJECTIVE
· To be aware of circumstances defined as "special operations".
· To locate and use the appropriate documentation.
· To be able to compute Take-off and/or Landing parameters.
02 - SCHEDULE
Briefing duration : 15 minutes
03 - EQUIPMENT
DOC references :
· QRH 4.03 (Ops data)
· FCOM 2.03.10 (Landing Performance)
· FCOM 2.03.20 (Use of autobrake)
· FCOM 2.04.10 (Fluid contaminated runway)
04 - INSTRUCTOR’S ACTIONS
Briefing of the following key points.
MAIN
· Aircraft operational requirement.
　
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