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Old 4th Aug 2009, 16:33
  #4123 (permalink)  
Hyperveloce
 
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AoA thresholds, Stall warnings & procedures

Originally Posted by HazelNuts39
RE: Hyperveloce (#4116)
No, you would have to ask Airbus Flight Test/Engineering.
Thank you HN39. Yes: CFD, wind tunnels, flight tests, and the return of experience will shape these AoA tables. But wouldn't it be of interest, for a pilot, to know these limits ? Aren't they the limits of his own authority as a pilot ? (before the automation overules him). Not knowing these limits could lead to a bad surprise from the automation: one day, nearing the limits of the flight envelope, these tables could activate a primary reflexes of the plane & litterally sort the pilot out of the control loop ? In fact, this already happened. Wouldn't it be usefull for a pilot who is handflying his plane (all the more in a critical phase, say at landing/take off) to know/be warned that the automation is about to take over the plane in a surprising move ?
Jeff
PS) Assuming a pilot decides to apply the stall procedure (in reaction to several stall warnings) and lowers the nose (and possibly increases the thrust if there is a margin left). Two flights have initiated a descent and departed from their initial route to avoid a possible traffic but they recovered their airspeeds rapidly during the descent and stabilized their altitude. How would the crew monitor the consequences/results of their actions (stall procedure) in the absence of airspeeds ? If these latter do not recover their normal values as rapidly as in the two previous cases, when would a crew abord his descent ?
Is it only necessary to get a couple of ADRs in agreement to recover the airspeeds and the normal display on the PFDs or is it required that the 3 ADRs are simultaneously consistent ?
Where is the GPS ground speed & altitude displayed in the cockpit ?
PPS) About the crew reaction to stall warnings: wouldn't it make a difference that the crew be {CoPi 32 yrs; CoPi 37 yrs} or {CPT 58 yrs; CoPi 32 yrs} if stall alarms sounded like in several cases of Pitot event ? If yes, is it probable that a crew rotation had occured before 02:10Z ?
..............CPT.... CoPi37....CoPi32.....................................
ATPL ......1990... 2001...... 2000* (*) only the theoretical part
Flight Hrs 10988* 6547...... 2936 (All types) (*) CaravelleXII,A320,Boeing 737
Flight Hrs 1747.... 4479 .... 807.. (A330/A340)
South Am 16....... 39........ 5..... (flights toward south America)

Last edited by Hyperveloce; 4th Aug 2009 at 20:32.
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