HOW TO SAVE FUEL BY LOSING TIME? · how to save fuel by losing time? jean-pierre nicolaon ... 260...
Transcript of HOW TO SAVE FUEL BY LOSING TIME? · how to save fuel by losing time? jean-pierre nicolaon ... 260...
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Air Traffic Management PanelOttawa, 5-6 November 2002
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AVIATION OPERATIONAL MEASURES FOR FUEL AND EMISSIONS REDUCTION
WORKSHOP
HOW TO SAVE FUEL BY LOSING TIME?
Jean-Pierre NICOLAONEUROCONTROL - EEC
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QIN ABSORBING ARRIVAL DELAYS LINEARY DURING DESCENT INSTEAD OF HOLDING STACK TECHNIQUE
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ARRIVAL TRAFFIC IS GENERALLY ORGANIZED THROUGH SUCCESSIVE
LAYERS:
QSTEP 1 QARRIVAL SLOTS (AIRLINES SCHEDULES) ARE DETERMINED ACCORDING TO RUNWAY CAPACITY (TYPICAL VALUE 44 a/c PER HOUR FOR SPECIALIZED RUNWAY)
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QSTEP 2 QDEPARTURE SLOTS (including overbooking) ARE ALLOCATED ACCORDINGLY BY ATFM (pretactical)
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QSTEP 3 QATC CONTROLLERS REFINE TRAFFIC SEQUENCES AS APPROPRPIATE (tactical)
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QNOTE: QOVERBOOKING IS REQUIRED TO COMPENSATE UNPREDICTABLE, UNEXPECTED AND INACCURATE ELEMENTS such as:²AIRLINES DELAYS
²FLIGHT CANCELLATIONS
²BAD WEATHER
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HOWEVER OVERBOOKING AND INACCURACY CAN INDUCE HOLDING BEFORE LANDING
THOSE DELAYS COULD BE ABSORBED EITHER :
QIN HOLDING STACK (e.g. London)QLINEARY (e.g. Paris CDG)
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ARRIVING TRAFFIC TO PARIS CDG + LE BOURGET
LFP3A Mon 29 Apr 2002
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RegF 923 Reg 2602 Réalisés 794PLN 785 Calculés 785 Regul ActiveOLH 128 OLH 122
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ARRIVING TRAFFIC TO PARIS CDG
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RegF 1155 Reg 1912 Réalisés 713PLN 717 Calculés 717 Regul ActiveOLH 116 OLH 114
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ARRIVING TRAFFIC TO PARIS ORLY
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RegF 1276 Reg 1723 Réalisés 345PLN 344 Calculés 344 Regul ActiveOLH 15 OLH 15
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QHOLDING STACK TECHNIQUE IS BEING USED AS AN AIRCRAFT TANK CLOSE TO RUNWAY FOR PREVENTING GAPS TO HAPPEN INTO LANDING SEQUENCES.QIT CAN BE USED EASILY
WITHOUT ANY COMPUTER ASSISTANCE
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QHOLDING STACK INDUCES SIGNIFICANT EXTRA FUEL BURNQIT ENABLES LONG DELAYS
ABSORPTION CAPABILITY
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QLINEAR HOLDING CAN ONLY ABSORB ‘REASONABLE’ DELAYS (5/7 minutes)QIT HAS TO BE COMPLEMENTED
BY HOLDING STACK FOR LONGER DELAYSQIT IS VERY SUITABLE TO HUB
SEQUENCES
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QIT IS SAVING FUEL EVEN COMPARED TO NOMINAL TRAJECTORYQIT REQUIRES COMPUTER
ASSISTANCE FOR EFFICIENT SEQUENCING AND SPACING
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QPROGRESSIVE SPEED REDUCTION PROFILEQSEGMENTED SPEED PROFILE
EXAMPLE OF AIRBUS A310 DESCENDING AT MINIMUM DRAG SPEED ACCORDING TO :
SAVED FUEL BURN/ ABSORBED DELAYS
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TRANSITION ALTITUDE
STANDARD DESCENT PROFILEM.;0,80 - 300 KT - 250 KT + HOLDING AT FL50
DESCENT PROFILE AT PROGRESSIVE REDUCED SPEED
DESCENT PROFILE AT SEGMENTED SPEEDS HOLDING
PROFILE ¬
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TYPICAL SPEED SEGMENTS
FLIGHT LEVELS CAS
390 – 310 235 Kts
310 – 260 220 Kts
260 – 200 210 Kts
200 – 50 200 Kts
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ABSORBABLE DELAYS DURING DESCENT ONLYFL ät
390350310280240200
+0526
+0522
+0451
+0440
+0345
+0255
FL: Flight level wheredescent is started
ät: Time intervalbetween both(standard-progressivereduction) descentprofiles
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FUEL BENEFITS COMPARISON/STACK VERSUS LINEAR
Absorbeddelay
Saved fuelcomparedto nominal
Extra fuelholdingstack atFL 200
Total fuelbenefits
FL Ät ÄcL ÄcA(Hippo atFL 200)
390 05’47” -366 kg +348 kg -714 kg350 07’26” -358 kg +449 kg -807 kg310 09’13” -290 kg +555 kg -845 kg280 10’38” -230 kg +640 kg -870 kg260 11’31” -190 kg +694 kg -884 kg240 12’40” -138 kg +766 kg -904 kg
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EXAMPLE OF COMPUTER ASSISTANCE
INFORMATION GIVEN BY MAESTRO - ARRIVAL MANAGER
CurrentTime
Runway 25 (Le Bourget)
Runway 26 left
Time Scale
Runway 27 (North)
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SEQUENCE DETAILS
IAF (origin)(S = Susin, M = Merue,
L = Lorta)
Callsign
AircraftType
Time at IAF
Current Delay
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WHAT MAGNITUDE OF BENEFITS COULD BE PROVIDED BY LINEAR
HOLDING ?QTHIS IS DEPENDING UPON
AIRPORT AND DEMAND COMBINATIONQHOWEVER SOME TYPICAL
VALUES ARE ALREADY AVAILABLE
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IN NORMAL CONDITIONSLINEAR HOLDING ALLOWS FUEL SAVING OF
2x60’x85kg = 10,200 kgPER DAY AT PARIS ORLYAND
3x110’x85kg=28,050kgPER DAY AT PARIS CDG
IN HEAVY SITUATIONAT PARIS ORLY (100’ min Delay)60’ OF LINEAR HOLDING ARE SAVING 60’X85kg = 5,100kgWHILE 40’ OF HOLDING STACK ARE INCREASING FUEL BURN BY 2,400kg
AT PARIS CDG (225’ min Delay)60’x85kg=5,100kg ARE SAVED WHILE 165’x60kg =9,900kg ARE LOST
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CONCLUSIONS
QLINEAR HOLDING REDUCES FUEL BURNQIT WORKS IN REAL LIFEQADDITIONAL BENEFITS CAN
BE OBTAINED BY LINEAR HOLDING:
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²REDUCTION OF FLIGHT TIME AT LOW ALTITUDE ÛLOWERING NOISE²REDUCTION OF FLIGHT TIME IN
THE HOLDING STACK ÛREDUCING RISK
QLINEAR HOLDING⇒THE WAY AHEAD
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AVIATION OPERATIONAL MEASURES FOR FUEL AND EMISSIONS REDUCTION
WORKSHOP
Thank you !