Avoiding Hard Landings Capt. Marc PARISIS Head of Flight and Cabin Crew Training Presented by: - презентация

1 Avoiding Hard Landings Capt. Marc PARISIS Head of Flight and Cabin Crew Training Presented by:

2 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Content Hard Landings definition, detection, classification Avoiding Hard Landings

3 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Content Hard Landings definition, detection, classification Avoiding Hard Landings

4 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Definition of Hard Landing : Pilots point of view Pilots judge subjectively and comparatively the landings as being: Soft – Normal – Firm – Hard Subjectively = modified or affected by personal views, experience, or background Comparatively = In a relative manner; by comparison to something else Hard landing suspected: when the pilot decide that a structural examination is necessary

5 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Hard Landing information : Maintenances side Maintenance uses objective data to classify the landings Recorded vertical acceleration at aircraft CG Recorded vertical speed using Radio Altimeter data Limit values will depend of: aircraft types and standards Quality of recorded parameters VERT ACC (g) VERT Speed Normal Landing Hard Landing Severe Hard Landing

6 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Load Report LOAD REPORT

7 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Classification of the landing by maintenance After a suspected hard landing: Classification of the landing using the Load Report Normal landing = no actions required Hard landing confirmed = perform inspection Severe Hard Landing confirmed = AOG contact Airbus Load Report not available = perform inspection

8 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Hard Landing confirmed: Maintenance inspection Inspection is divided in different phases Phase 1: general inspection for primary damage and indication of remote damage (mainly external) If damage = perform further inspection (phase 2) and required maintenance actions. If no damage = end of inspection No damage = Aircraft can temporarily return to service Grace period (e.g. 30 days or cycles) Waiting for further elaborated analysis of the event by Airbus Required structural strength is maintained Risk is only stress corrosion (e.g. gear not achieving full life)

9 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Identification of Hard Landing Pilot: Subjective judgment Maintenance: Objective but incomplete data Maintenance system only covers straightforward hard landing events –Rebounds, drift landing, landing with roll and high derotation on nose landing gear are not addressed by the current logic Pilot should provide additional information on landing conditions –Cockpit instrument indications, aircraft weight, quantity of fuel in each tank –If the touchdown was on main gears or on main and nose gears, or fast derotation of the nose gear. –If the landing was straight, drifting, unsymmetrical, bounced, – If the crew heard a noise possibly related to a structural failure

10 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Identification of Hard Landing: New problem The pilots perception judgment and reporting has proven to be effective However, the perception of the severity of the landing is not so obvious for: Long aircraft Flexible aircraft Complex landing gear system

11 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Future: Hard Landing Detector Design of new automatic self-reliant system with specific sensors and adapted high synchronized sampling rate This future system should Provide a rapid and direct Go OR No Go and inspect decision for all circumstances Indicate which part of the aircraft has been impacted and to which level Medium term (during development of this self-reliant system) Use selected data from this system to enhance the pilots conventional evaluation and reporting of the landings (data should be provided in a suitable way to be used directly by the pilots)

12 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Today situation The primary source of identifying a suspected hard landing is the flight crew It is flight crews duty to detect and report a suspected hard landing Airbus recommends the active use of the Load Report15

13 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Content Hard Landings definition, detection, classification Avoiding Hard Landings

14 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Main sources of Hard Landings Hard landings usually result directly from: Non-stabilized approaches Inappropriate approach speed Destabilization of the approach in the last 100 ft Incorrect flare techniques Incorrect derotation techniques (nose landing gear) And subsequently from: Reluctance to perform a go-around Dual sidestick inputs Bounce at landing incorrect recovery techniques Contributing conditions are: –Crosswind, Windshear or downburst –Limited runway

15 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Flying stabilized approaches Rushed and non-stabilized approaches are one of the main sources of hard landings Refer to the Flight Operations Briefing Notes Flying Stabilized Approaches Aircraft Energy Management during Approach If the aircraft is not stabilized at: 1000 feet in IMC, or 500 feet in VMC, or as restricted by Operator policy/regulations, a go-around must be initiated.

16 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Flying stabilized approaches

17 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Approach speed Determination of approach speed In most cases, the FMGS provides valuable VAPP on MCDU PERF APPR page once tower wind and landing configuration has been inserted The flight crew can insert a higher VAPP in case of strong suspected downburst, or gusty crosswind greater than 20 knots but this increment is limited to 15 kt above VLS Managed speed should be used Managed speed provides Ground Speed mini (GS mini) guidance, even when the VAPP has been manually inserted Ground Speed mini function will keep the aircraft energy level above a minimum value, whatever the wind variations or gusts.

18 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Destabilization of the approach in the last 100 ft Common errors Descending below the final path ("duck under") Reducing the drift too early Autopilot disconnection Pilot should disconnect the AP early enough to resume manual control of the aircraft and to evaluate the drift before flare. High sink rate avoidance In the very late stages of the approach, priority should be given to attitude and sink rate. If normal touchdown distance is not possible perform a go-around

19 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Flare techniques Flare height varies with different parameters such as weight, rate of descent, wind variations, … Avoid under flaring. The rate of descent must be controlled prior to the initiation of the flare (rate not increasing) Start the flare with positive backpressure on the sidestick and holding as necessary Avoid forward stick movement once flare initiated (releasing back-pressure is acceptable) Retard thrust levers when best adapted

20 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Derotation techniques – Fly the nose down When the aircraft is on the ground, pitch and roll control operates in Direct Law. Derotation is conventional Fly the nose down smoothly, but with no delay

21 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Reluctance to perform a go-around Go-around is possible at anytime until the selection of the reverse Even if a late go-around will not avoid the contact with the runway it should soften it and could avoid a hard touch Once the go-around has been initiated it must be completed Reversing a go-around decision is hazardous –e.g. F/o initiating a late go-around; Captain overriding and trying to land the aircraft

22 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Dual sidestick inputs The basic task sharing principle for any aircraft operation is that one pilot is PF at a time If the PNF feels he must intervene, he should press the Priority P/B while calling I have controls Instinctive Dual Input: instinctive reactions on the sidestick by the PNF surprised by the development of a dynamic situation In prolonged Dual Input situation : both PF and PNF will be aware of the dual input situation by the light and aural indicators. it is to the Captain to take over by pressing the Priority P/B while saying I have controls

23 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Bounce at landing

24 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Bounce at landing Flight Operations Briefing Notes Bounce Recovery - Rejected Landing Bounce at landing Maintain pitch attitude (freeze and control the pitch) Keep thrust idle Do not increase pitch (tail strike) Complete the landing Strong bounce Go Around Go around maintaining pitch attitude Keep flaps ; keep landing gear Only when positive climb is properly established –Flaps one step and Landing Gear up

25 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Crosswind landings

26 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Crosswind landings Flight Operations Briefing Notes Landing Techniques – Crosswind landings Final approach with crosswind drift correction with wings level (crabbed-approach) During the flare, rudder should be applied as required to align the aircraft with the runway. Any tendency to drift downwind should be counteracted by an appropriate roll input on the sidestick In case of very strong crosswind, combination of the partial de-crab and wing down techniques may be required Aircraft can be landed with a residual drift (max 5°) to prevent an excessive bank (max 5°)

27 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Windshear – Down burst: Apply FCOM procedures Delay landing, or divert to another airport, until conditions are more favorable Select the most favorable runway, in conjunction with the most appropriate runway approach aid Select Flaps 3 Use managed speed in approach phase Recovery techniques Set thrust levers to TOGA. If the autopilot is engaged, use it (be aware that automatic disengagement may occur) Follow SRS orders. Do not change configuration Closely monitor the flight path and speed

28 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Avoiding Hard Landing – Airbus documentation Airbus Operational and Training documentation FCOM – FCTM FCOM Bulletin N°819 Avoiding Hard Landings for LR Additional documentation Flight Operations Briefing Notes An e-briefing for pilots dedicated to hard landing prevention is available: Specific presentations Specific videos Operational and Training documentation references

29 © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document. April 2007Avoiding Hard Landings - 15th Performance & Operations conference Conclusion It is pilots duty to detect and report a suspected Hard Landing Hard landings usually result directly from: Non-stabilized approaches Inappropriate approach speed Destabilization of the approach in the last 100 ft Incorrect flare techniques Incorrect derotation techniques (nose landing gear) And subsequently from: Reluctance to perform a go-around Dual sidestick inputs Bounce at landing incorrect recovery techniques

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