Euromed GNSS II / MEDUSA project
Egypt national workshop, CAIRO - 12 March 2014 - NANSC
Civil AviationEGNOS/GNSS service usage, strategies and recommendations
Airliner :
Egypt AirEgypt Air Airlines
EGNOS Benefits - General EGNOS Benefits - approach (LPV) in comparison with NPA
Example : Lower DH and lower minima EGNOS Benefits - approach (LPV) in comparison with Baro-VNAV
Example : Human error and many corrections EGNOS Benefits - approach (LPV) in comparison with ILS
Example : Doubtful trust in ILS serviceability GALILEO Benefits Airline fleet ; related capabilities Expectations
EGNOSBenefits General
More accurate navigation More reliable navigation ( use / don’t use , estimated residual positioning error : Integrity )
( horizontal Alert Limit from 0.3 NM (556m) to 40 m ) ( Vertical Alert Limit 50 m )
Africa has an appropriate location (EGNOS foot print/EGNOS extension to cover North-Africa ) and is in need
Over half of all accidents occur during the final approach and landing stages
LPV benefits
# NPA
Lower decision height , lower minimaStable Airspeed , ROD* and FPA* (No intermediate step down ) Flight Director is a command instrument CFIT decreases Minimize arrival flight time and hence fuelReduce noise levels# NPA has a low safety record (most common accident/incident cause is descent below MDA(H)
EGNOSBenefits Approach
* ROD : Rate of Descent (ft/min) , FPA : Flight path angle
Safety increasesDelay and Cancellation of flights decreases
(i.e. Aerodrome capacity gain in low visibility)Diversion decreases
LPV # NPA
Lower DH and lower minima LFBDBordeaux MerignacRNAV (GNSS) Rwy 05
LPV benefits
# Baro VNAV
Baro VNAV is restricted to a minimum temperatureAltimetry is based on ISA density variation
Cold temperature correction Low pressure correction Hot temperature neglected although affecting
Destination altimeter subscale setting and human errorCheck by RA and EGPWS (2500’ AGL) (workload)
LPV # VNAV
Human Error / Many Corrections
Effect of one inch high altimeter setting
Unusual barometric pressure , such as 28.29 in Hg (low pressure) , when “in Hg” unit is used ,may be set , by mistake , to a more usual 29.29 in Hg ,resulting-in the true altitude (i.e. the aircraft’s actual height above MSL , being 1000 ft lower than indicated .
In most of baro-VNAV approach
LPV benefits
# ILS
Dependant on an international sourceDepends on national management / local navaid
A/C Flight path is loaded in the A/C Nav. Data BaseBroadcasted
Extends its service to all runwaysEach runway is “funded” individually
A0999/14 NOTAMR A0998/14Q) XXXX/QNAAO/IV/B/AE/000/999/….N…..E…A) XXXX B) 1401160733 C) PERM E) TRUST US AND DO NOT BELIEVE WHAT THE PILOTS SAY.THE ILS IS OKAY AND OPERATIONAL 100%.CREATED: 16 Jan 2014 07:41:00 SOURCE: XXXXYNYX
LPV # ILS
TRUST
‼ It happened : (a) flight(s) was(were) dispatched , with marginal weather conditions , according to the ILS minima, and after their return, the crew reported that the ILS was U/S .
( FICTIONAL NOTAM )
GALILEOBenefits
EGNOS is paving the path for GALILEO
Under civilian control
Interoperable with GPS and GLONASS
More increase in navigation positioning accuracy
Is vital where there is a lack of ground based navigation solution
Airline FleetRelated Capabilities
GPS receivers , autopilot and navigation system will need updating to be EGNOS capable RNP 4 is in progress ( for RNP 10 A/C’s )
GPS RNAV APCH RNAV 1 RNAV 100%
10%20%30%40%50%60%70%80%90%
100%
9375
95
50
725
5
40
EGNOS/GALILEOExpectations
More extension/coverage over Africa
More routes/airspaces based on GNSS and PBN capabilities
Technical assistance , training and cost-benefit analyses are expected
Thank you for your attention
Mérci pour votre attention
الله رحمة و عليكم السالم
Haytham Zaki abdelLatifSenior Flight dispatcherEgypt Air Airline
Email : . .Haytham Zaky@egyptair comE mail : [email protected]
Under Supervision ofCaptain / Mohamed Elian - G.M.IOCC Captain / Ayman Ghoneim - Deputy G.M.IOCC
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