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VAPP CALCULATION IN THE CASE OF AN ABNORMAL/EMERGENCY
CONFIGURATION
(1) Refer to ABN-80 LDG CONF/APPR SPD/LDG DIST On Dry Runways
Following Failures -
Introduction
EXAMPLE OF VAPP CALCULATION:
Failure : ALTN LAW
Flight Conditions : Autothrust ON, ice accretion
Landing Configuration : CONF 3
Headwind : 12 kt
Landing Weight/CG : 60 t
VREF determined from the landing weight : 125 kt
VREF correction due to the failure (ΔVREF) : 10 kt
As ΔVREF is equal to 10 kt, the APPRoach CORrection (APPR COR) is the highest
of:
5+5 = 10 kt (ice accretion ‐ and landing in CONF 3)
‐ 1/3 Headwind = 12 kt/3 = 4 kt
ABN-80
16/32
AQU3I1CK8 R/AEF3E1RE9N/ACE3 H2A0ND/A B3O2OK1
ABNORMAL AND
EMERGENCY PROCEDURES 30 AUG 10
A318/A319/A320/A321 FLEET , , , , , , , ,
, , , , , , , , , , ,
APPR COR = 10 kt and the landing distance must be multiplied by an additional
factor of 1.2
VAPP = VREF + ΔVREF + APPR CORR = 125 + 10 + 10 = 145 kt
USE OF THE FOLLOWING TABLES
USE OF THE LDG DIST FACTORS
Use the LDG DIST factors “WITHOUT REV”when:
‐ All reversers are inoperative, or
‐ Maximum reverse thrust on available reverser(s) is not selected, or
‐ The aircraft has been dispatched with one or more reverser(s) inoperative.
Use the LDG DIST factors “WITH REV”when at least one reverser is operative and
maximum reverse
thrust is selected at landing.
LDG CONF / APPR SPD / LDG DIST COMPUTATION FOR A SINGLE
FAILURE
Determine the FLAPS lever position for landing to be selected
Compute the VAPP: VAPP = VREF + Δ VREF + APPR COR
Determine ‐ the Δ VREF
‐ Determine the APPRoach CORrection (Refer to ABN-80 VAPP
CALCULATION)
Compute the LDG DIST:
‐ Determine the LDG DIST factor. Multiply it by the additional factor, if any (Refer
to ABN-80 VAPP
CALCULATION)
‐ Multiply the obtained LDG DIST factor by the ACTUAL LANDING DISTANCE
WITHOUT AUTOBRAKE
– CONFIGURATION FULL – without reversers correction (Refer to FPE-IFL
Landing Distance Without
AUTOBRAKE - CONF FULL)
LDG CONF / APPR SPD / LDG DIST COMPUTATION FOR MULTIPLE
FAILURES
Determine the Flaps lever position for landing to be selected:
‐ Use the lowest Flaps Lever Position for landing(i.e. if FULL and 3, use 3)
Compute the VAPP: VAPP = VREF + Δ VREF + APPR COR
‐ Use the highest Δ VREF to compute VAPP
‐ Determine the APPRoach CORrection (Refer to ABN-80 VAPP
CALCULATION)
Compute the LDG DIST:
‐ Determine the applicable LDG DIST factors in the same column (“WITH REV.”
or “WITHOUT REV.”)
‐ Multiply the applicable LDG DIST factors together, unless all values are marked
with an asterisk (*). If
all values are marked with an asterisk, use the highest LDG DIST factor. Multiply it
by the additional
factor, if any (Refer to ABN-80 VAPP CALCULATION)
‐ Multiply the obtained LDG DIST factor by the ACTUAL LANDING DISTANCE
WITHOUT AUTOBRAKE
– CONFIGURATION FULL – without reversers correction (Refer to FPE-IFL
Landing Distance Without
AUTOBRAKE - CONF FULL)
Examples applicable to Dry runways /A/THR ON / No wind / WITHOUT REV. / ice
accretion:
FAILURES Flaps Lever Position
For Landing Δ VREF APPR COR Additional
Factor LDG DIST Factor
FLAPS FAULT
(F < 3, S ≥ 1) 3 10 1.40*
BRK ANTI SKID FU3LL 6- 11..6705
RESULT 3 10
5 1.1
1.40×1.75×1.1=2.70
VREF = 131 kt. Therefore VAPP =131+10+5= 146 kt..
FAILURES Flaps Lever
Position for Landing Δ VREF APPR COR Additional
Factor LDG Factor
ALTN LAW 3 10 1.35*
FLAPS FAULT
(F < 1, S ≥ 1) 3 30 1.95*
RESULT 3 30
0 N/A
1.95
ABN-80
17/32
AQU3I1CK8 R/AEF3E1RE9N/ACE3 H2A0ND/A B3O2OK1
ABNORMAL AND
EMERGENCY PROCEDURES 30 AUG 10
A318/A319/A320/A321 FLEET , , , , , , , ,
, , , , , , , , , , ,
VREF = 140 kt. Therefore VAPP = 140+30 = 170 kt.
LDG CONF/APPR SPD/LDG DIST ON DRY RUNWAYS FOLLOWING
FAILURES - INTRODUCTION
Multiply the LDG DIST factors by the ACTUAL LANDING DISTANCE DRY
WITHOUT AUTOBRAKE -
CONFIGURATION FULL - without any reversers correction (Refer to FPE-IFL
Landing Distance Without
AUTOBRAKE - CONF FULL).
ABN-80
18/32
AQU3I1CK8 R/AEF3E1RE9N/ACE3 H2A0ND/A B3O2OK1
ABNORMAL AND
EMERGENCY PROCEDURES 30 AUG 10
A318/A319/A320/A321 FLEET , , , , , , , ,
, , , , , , , , , , ,
LDG CONF/APPR SPD/LDG DIST ON DRY RUNWAYS FOLLOWING
FAILURES
DRY RUNWAYS
　
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