PBN and the Cockpit
Workshop
Technical Requirements
FMS Operations and Aircraft Performances
Don-Jacques OULD FERHAT
Quovadis COO,
October 18th 2012
Summary of Existing Technical
Requirements
• Flight Technical Error (FTE)
• Flight Operational Safety Assessment (FOSA)
• Engine Out SID (EOSID)
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FTE ASSESSMENT
Path Definition Error (PDE)
Desired Path
Defined Path
Path Steering Error (PSE) or
Flight Technical Error (FTE) with AP
ON
Total System
Error (TSE)
Estimated Position
Position Estimation Error (PEE)
or Navigation System Error (NSE)
True Position
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FTE Assessment
No failure
FTE
Statistical
distribution
FTE (95%)
Wind
Wind
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FOSA
• FOSA stands for Flight Operational Safety
Assessment
• Eurocontrol Guidance Material released in
2010 and ICAO Working Paper few months
later
• But what does it really mean?
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FOSA Guidelines
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EOSID
The Departure Sector is defined in the EU-OPS 1.495.
The Obstacles are taken into account within a combination of:
• Cone from as defined in EU-OPS 1.495
• Corridor with half-width equal to 2xRNP value
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EOSID
Engine Failure at VEF and before DP (Diversion Point)
Minimum
Obstacle
Clearance
=> The EOSID is flown
Minimum
Obstacle
Clearance
EOSID and Obstacle Clearance
0.8%
Gross Flight Path
35ft or 50ft
Net Flight Path
0.8%
35ft or 50ft
End of Net FP
35ft or 50ft
Obs n°1
Obs
n°2
Obs
n°3
Obs
n°4
EF at VEF
As per:
• Certification Specifications (CS/FAR 25.111 & CS/FAR 25.115)
• Operating Rules (EU-OPS 1.495)
• ICAO PANS-OPS Chap. II.3.1.2 – Minimum Obstacle Clearance
• AC 120.91 – 9 (Termination of Takeoff segment)
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CONCLUSION
• FTE assessment methodology should be made
available for OEM
• FOSA guidelines should be endorsed by ICAO
and shared
• EOSID with RNP provide safety enhancement
and should be widely promoted
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