sidishus
Posts: 488
Joined: Mon Oct 25, 2004 1:45 am

Turbulence Upset In Louisiana

Mon Dec 20, 2004 2:16 pm


A severe turbulence outbreak ocurred in the central Gulf region this evening. One of particular interest was this one reported by an Airbus...
LFT UUA /OV LFT 360010/TM 2323/FL370/TP A319/TB SEV/RM NO DMG OR INJ-PUSHED AIRCRAFT UP 80 DEG

Question is, was this extreme upset caused by the turbulence itself?...Or was this really an anomaly of the semi-autonomous characteristics of the infamous Airbus flight control laws in the flight management system reacting badly to a severe turbulence regime?
While other aircraft also encountered severe (see the other pireps below), none had what was arguably a near departure from controlled flight situation.

Best resource around for looking at pireps is the Aviation Weather Center ADDS site
http://adds.aviationweather.noaa.gov/pireps/index.php

GLS UA /OV KGLS150030/TM 2315/FLUNKN/TP B737/TA M55/WV 27293KT/TB CONT LGT CHOP UNKN/RM CONT LT CHOP IN CLIMB FROM FL230-370 AWC-WEBCOA
GGG UA /OV GGG13635/TM 2322/FL340/TP A320/TB LGT-MOD
LFT UUA /OV LFT 360010/TM 2323/FL370/TP A319/TB SEV/RM NO DMG OR INJ-PUSHED AIRCRAFT UP 80 DEG
MOB UA /OV GCV /TM 2339/FL330/TP MD80/TB MOD
GLS UA /OV GLS 090030/TM 2340/FL265/TP LR45/TB LGT-MOD CHOP FL265-325
BTR UA /OV KBTR/TM 0024/FL410/TP B737/WV 287080KT/TB LGT CHOP/RM AWC-WEBSWA
GLS UUA /OV KGLS130200/TM 0110/FL240/TP B752/TB OCNL SEV CAT 240/RM 50NM SE OF KELPP AWC-WEBCOA
MSY UA /OV HRV 095020/TM 0121/FL350/TP H25B/TB MOD CHOP
LCH UA /OV LCH 180110/TM 0137/FL300/TP B727/TB MOD FL300-280
LCH UA /OV KLCH/TM 0255/FL240/TP CRJ2/SK CLR/WV 332043KT/TB OCNL LGT/RM AWC-WEBCAA






the truth: first it is ridiculed second it is violently opposed finally it is accepted as self-evident
 
OPNLguy
Posts: 11191
Joined: Tue Jun 15, 1999 11:29 am

RE: Turbulence Upset In Louisiana

Mon Dec 20, 2004 3:20 pm

>>>Or was this really an anomaly of the semi-autonomous characteristics of the infamous Airbus flight control laws in the flight management system reacting badly to a severe turbulence regime?


Gee, that should be good for at least 30-40 A versus B messages....  Big grin

The jetstream was coming down MSP-LFT and then making a 90-degree bend eastbound today, right?

[Edited 2004-12-20 07:22:25]
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
pilotaydin
Posts: 2099
Joined: Tue Sep 07, 2004 12:30 am

RE: Turbulence Upset In Louisiana

Mon Dec 20, 2004 3:30 pm

OMG no....you just unlocked the cage....

in the red corner...and in the blue corner... FIGHT
The only time there is too much fuel onboard, is when you're on fire!
 
sidishus
Posts: 488
Joined: Mon Oct 25, 2004 1:45 am

RE: Turbulence Upset In Louisiana

Tue Dec 21, 2004 2:52 am

This is a serious question with no intentions of fanning any A vs. B debates...Except maybe in tthe inherent benefits and weaknesses of the differing avionics design philosophies.
A not too dissimilar situation happened to a DC-10 in 1998 where a faulty switch in the autopilot system caused an upset while the aircraft was flying through some turbulence . Initially it was blamed on the turbulence alone because the aircraft was travelling through plenty of it.

http://www.cnn.com/US/9805/21/briefs.pm/jet.turbulence/
http://cimss.ssec.wisc.edu/goes/misc/980521.html
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001211X10120&key=1

Its a very valid question to ask if there was indeed a flight control issue involved as well that caused this A-319 to pitch up 80 degrees.

Here is another point of interest. A friend of mine was getting his IOE in an Airbus product about 3 weeks ago. They were shooting a CAT III in a stiff crosswind when the aircraft suddenly banked 20+ degrees at less than 1000 feet. There is still some head scratching going on with this one...

the truth: first it is ridiculed second it is violently opposed finally it is accepted as self-evident

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