Solution could be a sensor that is not affected by FOD. When performing a systems analysis FMEA and determine an item is critical, the people analyzing can drive themselves crazy trying to find the perfect solution.
Such as an Inertial unit similar to that used on 777-787 ?
Introducing the 787 Tom Dodt
http://www.ata-divisions.org/S_TD/pd...ngtheB-787.pdf
Chief Engineer - Air safety Investigation
ISASI september 2011
Pages 39 thru 41
Common Mode Hazards to Pitot-Static sensors
- Mud Daubers
- Icing
- Hail
- Birds
- Taped Static Ports
- Volcanic Ash
- Radome failure
- Pitot covers
- Maintenance errors (pneumatic plumbing)
•
787 new capabilities for protection - Synthetic airspeed
- GPS altitude
- Common Mode Monitor
Calculated from angle of attack and inertial data
- AOA – voted dual sensors plus inertial data
- Accurate Coefficient of Lift (CL)
- Airplane Mass from FMC - Validated after Takeoff
•
Algorithm developed for enhanced stall protection
•
Avoid displaying data known to be bad
- Loss of valid voted VCAS = Display synthetic airspeed VSYN - Loss of valid voted PSTATIC = Display GPS altitude