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Emirates Flight hits heavy turbulence over Goa

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Emirates Flight hits heavy turbulence over Goa

Old 27th Apr 2010, 17:01
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Does anyone have authentic information on what happened? Was the turbulence while passing through a Cell or was it CAT? So many people shoot here left right and centre! Looking for experienced airline pilots sharing any severe turbulence encounters for benefit of others.....
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Old 28th Apr 2010, 01:01
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If they were passing through a cell, there would have been a prior PA and somebody would have pressed the FSB button. Judging by reported injuries, it appears this was not the case.
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Old 28th Apr 2010, 06:11
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Just for informational purposes...

aircraft turbulence—Irregular motion of an aircraft in flight, especially when characterized by rapid up-and-down motion, caused by a rapid variation of atmospheric wind velocities.

This can occur in cloudy areas (particularly towering cumulus and lenticular clouds) and in clear air. Turbulence is the leading cause of nonfatal passenger and flight attendant injuries. The U.S. Federal Aviation Administration (FAA) classifies aircraft turbulence as follows:

Light: Causes slight, erratic changes in altitude and/or attitude, and rhythmic bumpiness as occupants feel a slight strain against seat belts.

Moderate: Similar to light, but of greater intensity, with rapid bumps or jolts, and occupants feel a slight strain against seat belts.

Severe: Turbulence that causes large, abrupt changes in altitude and attitude, and large variations in airspeed, with the aircraft temporarily out of control. Occupants are forced violently against their seat belts and objects are tossed about, with food service and walking impossible.

Extreme
: The aircraft is tossed about so violently that it is practically impossible to control, and structural damage may occur.

I wasn't there and I don't believe anything the Indian papers or any media say about aircraft incidents, so I can't speak to what happened. I just wanted to post the accepted definitions of turbulence severity for the purposes of this discussion.
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Old 28th Apr 2010, 06:20
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Wasn't there a report on Structural damage someplace.
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Old 28th Apr 2010, 13:42
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Many years ago my sister (age about seven) came home off a flight and told big brother it had been 'very bumpy'. Big brother poo-pooed her story but finally asked how bad it had been. 'Well, when it started I was sitting on the toilet and it threw me off and I hit my head on the door'. I guess that would be 'severe', then.
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Old 28th Apr 2010, 18:30
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PA - what are you prattling on about
The hidden loophole in this

§ 25.341 Gust and turbulence loads.

(a) Discrete Gust Design Criteria. The airplane is assumed to be subjected to symmetrical vertical and lateral gusts in level flight. Limit gust loads must be determined in accordance with the provisions:
(1) Loads on each part of the structure must be determined by dynamic analysis. The analysis must take into account unsteady aerodynamic characteristics and all significant structural degrees of freedom including rigid body motions.
(2) The shape of the gust must be:


for 0 ≤ s ≤ 2H
where—
s=distance penetrated into the gust (feet);
Uds=the design gust velocity in equivalent airspeed specified in paragraph (a)(4) of this section; and
H=the gust gradient which is the distance (feet) parallel to the airplane's flight path for the gust to reach its peak velocity.

(3) A sufficient number of gust gradient distances in the range 30 feet to 350 feet must be investigated to find the critical response for each load quantity.
(4) The design gust velocity must be:


where—
Uref=the reference gust velocity in equivalent airspeed defined in paragraph (a)(5) of this section.
Fg=the flight profile alleviation factor defined in paragraph (a)(6) of this section.

(5) The following reference gust velocities apply:
(i) At the airplane design speed VC: Positive and negative gusts with reference gust velocities of 56.0 ft/sec EAS must be considered at sea level. The reference gust velocity may be reduced linearly from 56.0 ft/sec EAS at sea level to 44.0 ft/sec EAS at 15000 feet. The reference gust velocity may be further reduced linearly from 44.0 ft/sec EAS at 15000 feet to 26.0 ft/sec EAS at 50000 feet.
(ii) At the airplane design speed VD: The reference gust velocity must be 0.5 times the value obtained under §25.341(a)(5)(i).
(6) The flight profile alleviation factor, Fg, must be increased linearly from the sea level value to a value of 1.0 at the maximum operating altitude defined in §25.1527. At sea level, the flight profile alleviation factor is determined by the following equation:


Zmo=Maximum operating altitude defined in §25.1527.

(7) When a stability augmentation system is included in the analysis, the effect of any significant system nonlinearities should be accounted for when deriving limit loads from limit gust conditions.
(b) Continuous Gust Design Criteria. The dynamic response of the airplane to vertical and lateral continuous turbulence must be taken into account. The continuous gust design criteria of appendix G of this part must be used to establish the dynamic response unless more rational criteria are shown.
[Doc. No. 27902, 61 FR 5221, Feb. 9, 1996; 61 FR 9533, Mar. 8, 1996]
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Old 29th Apr 2010, 20:42
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So any updates on the incident?
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Old 30th Apr 2010, 21:15
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SLF3b

Big brother poo-pooed her story but finally asked how bad it had been
"You know, if there's one thing I've learnt from being in the Army, it's never ignore a pooh-pooh. I knew a Major, who got pooh-poohed, made the mistake of ignoring the pooh-pooh. He pooh-poohed it! Fatal error! 'Cos it turned out all along that the soldier who pooh-poohed him had been pooh-poohing a lot of other officers who pooh-poohed their pooh-poohs. In the end, we had to disband the regiment. Morale totally destroyed... by pooh-pooh" General Sir Cecil Hogmanay Melchett
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Old 2nd May 2010, 00:31
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So a plane falls [reportedly] 15000' and no one knows anything?

did it happen?

maybe we can get a better talk going in Tech Log
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Old 2nd May 2010, 03:17
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PA,

Non-event.

Hit a bump.

No altitude deviation

Minor abrasions to people who should have had their seat-belt on and didn't.

Indian Press reporting at about its usual (non) standard.

What else would you like to know?
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Old 2nd May 2010, 10:56
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Pugilistic Animus grasp of aerodynamics puts me in mind of what a certain aircraft designer once said:

"If someone can't explain the design of an aircraft in simple terms...then they are usually talking balls!" R.J.Mitchell

or should it be RJM?
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Old 2nd May 2010, 11:46
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If you cant dazzle them with brilliance, then baffle them with bull****...mm think we just experienced this..
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Old 2nd May 2010, 11:57
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Thanks guys


I had to give up quite a few dates for that



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Old 5th May 2010, 12:30
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I was fying the same day arriving after Emirates ,Turbulence was there
but more it it the fast difference of ISA in this part of the area from +10 to ISA+20 wich can be a serious problem associated with turbulence
Margin decrease . We cannot say the monsoon start really in the south of India it is pre monsoon ,it comes after mid june ,the north of India is more concern.
Good job Emirates!
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