Airbus - Landing Distance With Failure Brief

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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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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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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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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  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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  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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  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


  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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Factor = 2.40

No Add. Factor

APPR COR = 0 kts

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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



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QRH F/CTL ALTN LAW W=56t, wet rwy, ice accretion, no wind, with REV.

Factor = 1.20


Add. Factor = 1.20

APPR COR = 10kts

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ALD with failure with REV = 1110 x 1.20 x 1.20 = 1584 m


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


Add. Factor = 1.10 APPR COR = 5 kts

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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

Airbus - Landing Distance With Failure Brief

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Transcript of Airbus - Landing Distance With Failure Brief