airbus - landing distance with failure brief
TRANSCRIPT
Landing Distance with failures New Landing Distance Factors
This is a cut-down version of an Airbus
presentation
We have reduced the content in order to focus on the main
points of the changes being brought in with
QRH Revision 43
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Hypothesis of computation
Dry & Wet & Contam’d
Vref Conf FULL Max Manual
Braking No Reverse
Thrust
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Hypothesis of computation
Clearer and more operational
NEW
DRY & WET & CONTA
Vref + ΔVref Secondary
failed systems
No Reverse Thrust
Vref + ΔVref Secondary failed systems
Max Reverse Thrust on all operative rev
WET & CONTA
Max Reverse Thrust on all operative rev
Sometimes incompatible
OLD
Vref + ΔVref Secondary failed
systems
DRY
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Hypothesis of computation Use of the LDG DIST Factors:
Only one exception: dispatch under MEL with one reverser inoperative
At least 1 reverser operative: Select ALL thrust reversers
All reversers inoperative and/or de-activated: Do NOT select thrust reversers
Airbus policy on selection of thrust reversers (refer to FCTM AO-020)
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Hypothesis of computation
Failure in Flight
Exception case: Dispatch with one reverser inop
STATUS
-LDG DIST PROC…APPLY
One reverser deactivated
Dispatch MEL
+
At landing: Select ALL thrust reversers
BUT
At least one reverser
operative
At landing
BECAUSE
THEN
IF
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Hypothesis of computation
OLD NEW
DRY WET & CONTA
Without REV X
With REV X
x
x
Without REV
With REV
DRY X X
WET & CONTA X X
x
= = = =
x
LDG DIST Computation:
x
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Hypothesis of computation
New VAPP Computation:
Approach speed = Vref
Approach speed = Vref + ΔVref
More operational ALD with failure
LDG DIST increases
The use of A/THR (additional 5 kts) The Headwind
Ice accretion on non heated structure
Additional Factor defined in QRH
Increased ground speed
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Impacts in OPS Documentation TABLES
OLD NEW One page for all runway states One page per runway state
On LDG DIST Factors:
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Impacts in OPS Documentation TABLES
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Impacts in OPS Documentation TABLES
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Impacts in OPS Documentation TABLES
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Impacts in OPS Documentation TABLES
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Impacts in OPS Documentation TABLES
New LDG CONF/APPR SPD/LDG DIST FOLLOWING FAILURES tables:
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Impacts in OPS Documentation SUMMARIES
New SUMMARY tables:
Data computed without the credit of the reverse thrust - In most Summaries: REV are inop - Conservative approach
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Impacts in OPS Documentation SUMMARIES
New SUMMARY tables:
If one or more reverser(s) are still operative: Actual Landing Distance WITH REV
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QRH Summary C R U I S E VAPP = VREF + ΔVREF + APPR COR (if applicable)
APPROACH SPEED LANDING CONF
A P P R
L A N D I N G
G A
VREF = VLS CONF FULL
WEIGHT
ACTUAL LANDING DISTANCES (m / ft) WITH FAILURE WITHOUT REV (a)
DRY runway
WET runway
Refer to 4.03 and apply LDG DIST Factor = X.XX CONTA runway
WEIGHT
Impacts in OPS Documentation SUMMARIES
Use of SUMMARIES:
3
If APPR COR check if Additional Factor
is applicable
APPR COR
yes
Add. Factor Decision
no
When the failure occurs 1
2
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Examples of computation Example 1: ELEC DC Bus 1+2 Fault
QRH ELEC DC BUS 1+2 FAULT W=60t, dry rwy, ice accretion, no wind, conf 3
Factor = 2.40
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Examples of computation Example 1: ELEC DC Bus 1+2 Fault
QRH ELEC DC BUS 1+2 FAULT W=60t, dry rwy, ice accretion, no wind, conf 3
Factor = 2.40
No Add. Factor
APPR COR = 0 kts
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Examples of computation Example 1: ELEC DC Bus 1+2 Fault
QRH ELEC DC BUS 1+2 FAULT W=60t, dry rwy, ice accretion, no wind, conf 3
Factor = 2.40
No Add. Factor
ALD with failure without REV = 850 x 2.40 = 2040 m
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Examples of computation Example 2: F/CTL Alternate Law
QRH F/CTL ALTN LAW W=56t, wet rwy, ice accretion, no wind, with REV
Factor = 1.20
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Factor = 1.20
Examples of computation Example 2: F/CTL Alternate Law
QRH F/CTL ALTN LAW W=56t, wet rwy, ice accretion, no wind, with REV
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QRH F/CTL ALTN LAW W=56t, wet rwy, ice accretion, no wind, with REV.
Factor = 1.20
Examples of computation Example 2: F/CTL Alternate Law
Add. Factor = 1.20
APPR COR = 10kts
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Examples of computation Example 2: F/CTL Alternate Law
ALD with failure with REV = 1110 x 1.20 x 1.20 = 1584 m
QRH F/CTL ALTN LAW W=56t, wet rwy, ice accretion, no wind, with REV
Factor = 1.20
Add. Factor = 1.20
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Examples of computation Example 3: Use of Summary, Double Hydraulics Failure
QRH HYD B+Y SYS LO PR W=60t, wet rwy, A/THR On, conf 3, no wind, w/t REV
ALD = 2310 m
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QRH HYD B+Y SYS LO PR W=60t, wet rwy, A/THR On, conf 3, no wind, w/t REV
ALD = 2310 m
Examples of computation Example 3: Use of Summary, Double Hydraulics Failure
Add. Factor = 1.10 APPR COR = 5 kts
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Examples of computation Example 3: Use of Summary, Double Hydraulics Failure
ALD = 2310 x 1.10 = 2541 m
W=60t, wet rwy, A/THR On, conf 3, no wind, w/t REV QRH HYD B+Y SYS LO PR
ALD = 2310 m
Add. Factor = 1.10
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Conclusion
• More logical computation method (credit for reverse thrust) No longer a reverser correction on the ALD without failure LDG DIST Factors with REV / without REV
• In line with the new Airbus policy on the thrust reverser selection
• The LDG DIST with failure takes into account more operational cases (Dispatch, A/THR ON, ice accretion) Dispatch with reverser inop: Use the LDG DIST Factor without REV Do not forget to take into account Additional Factor, if applicable
• Available at the next general revision of QRH (Rev 43)
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Conclusion
• A more thorough briefing will be issued shortly to all pilots
• This presentation is a “heads-up” for all Airbus Training
Captains and should not be distributed