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Spanair accident at Madrid

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Spanair accident at Madrid

Old 29th Aug 2008, 02:00
  #1201 (permalink)  
 
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TOCW locked out in flight mode in not really the problem, it's the ability to be in flight mode while on the ground. How does this situation come to be (how does flight mode while grounded begin), and why hasn't this problem been addressed (assuming it's been known for ages)?
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Old 29th Aug 2008, 02:15
  #1202 (permalink)  
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xander:
I think all planes will have the same happen to their TOCW system if the plane thinks it is airborne. The TOCW system will cease to work
With respect, you simply can't make such a generalization. Not, at least, unless you've got Airbus 320/330 time and even then the statement is almost certainly incorrect. Christine works in mysterious ways our wonder to behold...
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Old 29th Aug 2008, 02:24
  #1203 (permalink)  
 
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TOCW in flight is a huge problem, usually as the result of faulty prox sensors. Aircraft believes it is on the ground in flight. T/O configuration horn sounds, believing flaps and slats / leading edge devices are not configured for T/O. Outflow valves open and pressurization is rapidly lost. Mode S lost due to aircraft believing it is on gdn. The list goes on.
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Old 29th Aug 2008, 02:31
  #1204 (permalink)  
 
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The information from the judiciary investigation continues not giving any probable causes. There is obviously not some "major event" that can be plainly observed to have caused the accident.

700 pages, no probable cause found by the judge so far.

Crew workload the past few weeks was normal. Judge wants to question the mechanic technician that did the probe heater "repairs" again as he didn't mention the first time about the reverser having been locked out of service 3 days before (presumably by two fellow technicians). The judge wants to know if he noticed what state the reversers were in.

Another (unspecified in the article) maintenance issue appears a few days before on a flight to/from Barcelona.

July 26th the airplane was taken back to maintenance area while taxiing to t/o from Palma de Mallorca because the pilot felt the front landing gear was making more noise than usual. Mechanics checked for 36min and didn't find anything wrong. The pilots and technicians agreed it was probably caused because the gear was too new (I guess it had recently been replaced/overhauled). Flight continued without incidents to Copenhagen. (Maybe the valve/sensor that feels the weight to indicate "ground mode" was involved?)

So the judge is waiting for more information from the technical investigators to figure out the probable cause and any (if at all) criminal responsabilities.

It seems that only analysis of the FDR (and sound recorder to an extend) can really shed enough light to figure out what most likely happened.

Last edited by justme69; 29th Aug 2008 at 02:45.
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Old 29th Aug 2008, 02:57
  #1205 (permalink)  
 
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Old 29th Aug 2008, 03:04
  #1206 (permalink)  
 
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Old 29th Aug 2008, 03:18
  #1207 (permalink)  
 
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Trim.Flaps.Spoilers

PJ2:
As such, I personally would have nothing further to say with respect to "killer items" as this thread covers them sufficiently
Thanks for your further clarification and patience. I will read the books you note. I think I might have misunderstood your original drift. Depending on the final outcome of the investigation of course, it is a little discouraging to know that nothing more can be done to eliminate human factors in such regard. Statistical significance having been understood.
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Old 29th Aug 2008, 04:33
  #1208 (permalink)  
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philipat;
Depending on the final outcome of the investigation of course, it is a little discouraging to know that nothing more can be done to eliminate human factors in such regard.
I understand perhaps, but to remain discouraged is to remain discouraged with what is and will never change, and not just in aviation.

The goal to "eliminate" human error is a mistaken goal. Recognition of that fact alone is what can make aviation safer for as soon as one sets aside any idea that perfection can be achieved (or that one actually has it already!, and believe it or not, such hubris exists within aviation today), one can make progress in flight safety, first by being on one's guard and second by building anticipatory/preventative procedures/systems which are at once robust, but not brittle.

The term "brittle" means that a design must be at or close to perfection before it will work properly. The opposite term might be "resilient" but I'm not sure that entirely captures the full idea that pursuing perfection so that mistakes don't occur, is itself, a mistake.

Last edited by PJ2; 29th Aug 2008 at 05:03.
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Old 29th Aug 2008, 07:29
  #1209 (permalink)  
 
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Judge has watched 18 video recordings concerning the accident (I'm assuming many of those of witnesses nearby AFTER the crash itself, but including the 7 seconds airport recording the captures the exact moment of the accident).

Preliminary technical reports received by the judge by technical investigators concentrating on the engines confirm the engines neither exploded nor catched fire prior to the accident. Most of this conclusion comes from analysis of the airport surveillance video recorders that captures the accident and witnesses.

Most spanish press gives this scenario as certain: Pilot tried to take off until the last possible moment, but when he touched ground again he deployed the only working reverser (left) while the right one couldn't be used as it was locked-out-of-service for maintenance.

6 of the crew members on board were on active duty. Another 4 crew members were flying avant.

Sitting next to 1C seat of crew survivor flight attendant Antonia Martinez was another Spanair pilot, an airbus commander. The flight attendant couldn't hear anything from the cabin (she never was there) but she recalls the comments of her partner sitting right next to her (the airbus pilot) as soon as take-off commenced: "Something weird is happening here" (referring to the way he perceived the take-off maneuver).

She continues in her declaration to the judge: "The airplane couldn't climb, like if it wasn't able to cope with the weight of the plane, it zig-zaged laterally and I thought it was trying an emergency landing. The lateral moves were very abrupt, the airplane was out of control".

She didn't see any fire. She found herself in the creek's water undeneath some probably metal sheet of fuselage and someone was pulling her hair and shoulders trying to help her.

She confirms the pilot didn't address the PAX during the accident (obviously not enough time or a priority).

Last known communciation from him to air controller Enrique. A. who lost visual contact with the plane at 14.24 (until flight voice recorder communications are recovered and anaylized). The pilot repeated the parameters given by the controller to take-off and acknowledges having permission to TO.

Judge declares work fatigue not a factor, as both pilots were under 60 hours in 20 days.

One of the survivors declares the "sudden roll movements" so abrupt that in 2 seconds he could see through the window "landing strip, sky, landing strip again". He found himself still strapped (buckled up, I guess) to his seat with one of his arms trapped underneath a piece of fuselage.

Most survivors accounts of the accident are very imprecise. They all talk of normal feeling take off, sudden weird left and right movements and vibrations, and then crashing.

Initial rumors about the left engine catching on fire came from an airport worker (no idea what they are called in english, it's usually the guys that drive around the "follow me" cars or perhaps make indications to the airplane to turn right/left with those funny flashlights). He is one of only two sources for evidence, though, about such a thing, which wasn't captured by the video recordings etc.

The judge received the testimony of a flight attendant from a nearby plane incoming from Guayaquil. She didn't see the airplane herself but declares to have heard a comment by her flight's commander: "He is eating the strip" (referring to the Spanair airplane using almost all available runaway, although remember at least another 600m of paviment was available). She said the pilots commented on that engine "flashing" and the MD-82 "falling like a leaf".

Many witnesses speak of abrupt roll but also of some yaw (after leaving the ground).

Air traffic controller in charge of the flight declared to his boss: "The airplane I just authorized to TO, I think it fell down. The nose went up, but couldn't lift-off, started to roll side-to-side and then I couldn't see it anymore".

The control tower supervisor said she had heard some vague talk about an Spanair flight with engine problems earlier in the day. But evidence to that doesn't show up anywhere.

The weight of the airplane according to ground papers was 64.263kg. 11.189kg of fuel. Most cargo has been destroyed in the accident, only a few pieces have been recovered.

22 pieces of luggage belonged to the crew. 115 pieces to PAX. Plus undetermined carry-on.

It carried 400kg of fresh-fish cargo on a refrigerated container. Also some cargo for shoe manufacturer Timberland. A live animal (a dog, didn't survive the accident, has been retrieved).

Last edited by justme69; 29th Aug 2008 at 16:22.
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Old 29th Aug 2008, 08:05
  #1210 (permalink)  
 
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If inop TRs are found to be a factor at Madrid and Sao Paulo, as pax I'd like to see any TR inop situation make an aircraft unserviceable
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Old 29th Aug 2008, 08:29
  #1211 (permalink)  
 
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22/04 - Difficult to scan 1200+ posts, but a previous one has already stated that aircraft are certified with wheel brakes only, thrust reversers are a bonus: without them a/c meet regulatory specifications, with them they exceed it.

If you expect TOTAL safety in any mechanical device operated by man, then stay in bed - where you will eventually die anyway, - sorry to sound callous but this is a real World governed, and not too badly in fact, but economics.

That's not trying to minimise the suffering, just being realistic.
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Old 29th Aug 2008, 08:32
  #1212 (permalink)  
 
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Any news about the FDR condition ?

Also CVR was supposed to be in good shape - surprisingly no mention so far in official briefings
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Old 29th Aug 2008, 08:52
  #1213 (permalink)  
 
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Most spanish press gives this scenario as certain: Pilot tried to take off until the last possible moment, but when he touched ground again he deployed the only working reverser (left) while the right one couldn't be used as it was locked-out-of-service for maintenance.
How can the Spanish press be certain about anything regarding this accident at this stage with an investigation barely underway in which FDR and CVR data are still under investigation? Looking at recently posted pictures, there is very little left of the aircraft and regardless of claims made early on in this thread, i have not seen any pictures of anything resembling a piece of wing, let alone one which would show retracted slats or flaps.

Furthermore i repeat my question from post #1202:

On the MD82, with ATS engaged and TOGA or FLEX selected, in the event of a reverser unlock during takeoff, is the thrust lever automatically retarded to idle by the reverser mechanical interlock system and the ATS disconnected? If such an event occurred after passing 80kt or during rotation would an alert be inhibited until an altitude of 1000ft?

On an aircraft type i worked on several years ago (no MD8x models) this is the case and a thrust reverser unlock alert is inhibited between a speed above 80 kt until 1000ft AGL. If in this accident, a TR unlocked near rotation or at lift-off, and with similar design/certification criteria no alert was presented, how would the crew react to a thrust lever retarding to idle? I assume, if the MD82 has a similar interlock mechanism and alert inbit it must be part of training to identify such an event as a possible uncommanded TR deployment?

Whatever happened, things happened fast and the crew must have had very little time to identify the problem.


Regards,
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Old 29th Aug 2008, 09:02
  #1214 (permalink)  
 
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Yeah, it has been mentioned before. FDR recorder data has been successfully retrieved and it's being verified and analysed by Boeing.

Voice recordings are not of good quality (not fully understandeable), so it's been filtered and enhanced in labs prior to analysis.

Green-dot: yeah, you know how reliable the press is. Since we don't know if take off took longer than normal before or after VR, it is indeed still possible a scenario where a reverser accidentaly deployed around VR. But the flight attendant speaks of the Airbus pilot avan speaking of "something weird" just about as soon T/O was initiated. One would like to assume a pilot with over 10 years of experience would've noticed a deployed reverser before V1.

The press also insists on this airplane not being able to deploy reversers unless on the ground, but I think others here have confirmed that the MD-82 indeed can have them deployed while flying, even voluntarily (so even more in case of a malfunction).

Have there been cases of MD-82's with truly uncommanded reverser deployment under "normal conditions" (i.e. totally smooth operation, no other problems, turbulence, bad weather etc)?

Last edited by justme69; 29th Aug 2008 at 09:18.
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Old 29th Aug 2008, 09:21
  #1215 (permalink)  
 
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Thrust-reverser related accidents. (from Wiki.)

In-flight deployment of thrust reversers on aircraft not having that function as a design feature has directly contributed to the crashes of several transport-type aircraft:

• On 9 February 1982, Japan Airlines Flight 350 crashed 1,000 feet (300 m) short of the runway at Tokyo Haneda Airport following the intentional deployment of reverse thrust on two of the DC-8's four engines in an apparent suicide attempt, resulting in 24 passenger deaths.

• On August 29, 1990, a Lockheed C-5A crashed shortly after take-off from Ramstein Air Base in Germany. As the aircraft started to climb off the runway, one of the thrust reversers suddenly deployed. This resulted in loss of control of the aircraft and the subsequent crash. Of the 17 people on board, only 4 survived the crash.

• On 26 May 1991, Lauda Air Flight NG004. The Boeing 767-300 aircraft suffered an uncommanded deployment of the No. 1 thrust reverser, which caused the airliner to stall and crash.[1] All 213 passengers and 10 crew were killed.

• On October 31, 1996, TAM Linhas Aéreas Flight 402. The Fokker 100 crashed shortly after take-off from Congonhas/São Paulo International Airport, São Paulo, Brazil, striking an apartment building and several houses. All 90 passengers and 6 crew members on board died. Three people were killed on the ground. The crash was attributed to the uncommanded deployment of a faulty thrust-reverser on the right engine shortly after take-off.
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Old 29th Aug 2008, 09:30
  #1216 (permalink)  
 
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I knew of several accidents most likely caused by an accidental reverser deployment, but being, from my understanding, an active system that requires of hydraulic assistance to be deployed (under normal, not extreme conditions such as strong vibrations, etc), I always thought it would be quite "impossible" for one to deploy "just like that".

Again, I understand it becoming loose or whatever from bangs, vibration, extreme weather, etc, but thought that under normal conditions an ACTIVE rather than passive type of malfunction would have to be necessary to make them engaged.

If it is a design problem that allows for a malfunction to trigger them, wouldn't it have been solved by now? Nobody would fly a thing that under some "normal" circunstances could enter reverse w/o warning ...

Last edited by justme69; 29th Aug 2008 at 09:53.
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Old 29th Aug 2008, 09:31
  #1217 (permalink)  
 
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One question, justme69, why is there a Judge involved in the investigation? Is this a mistranslation, or is this indeed a trial already? Shouldn't this be analysed by experts from an accident investigation branch of the aviation authority?
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Old 29th Aug 2008, 09:35
  #1218 (permalink)  
 
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It has been explained before that, due to the large number of victims, until criminal intentions (i.e. terrorist attack), behaviours or neglicency can be ruled out and the case can be classified as an accident, a parallel (and higher in hierarchy) judicial investigation is being carried on.

All evidence must be presented to the judge in charge of the case. The judge has allowed the parallel technical civil aviation authorities' investigation to be carried on at the same time.

So until the judge is satisfied that it was an unfortunate accident (no criminal intent) and nobody knowingly screwed up too much (no criminal neglicency), he is the top person in charge.

The judge in this case could perhaps be thought as a General Attorney in the US or similar. He is a judge, but judges are able to initiate and command investigation in Spain's judiciary system, and usually do so in cases involving large organizations (drug cartels, terrorism), etc.

He sees probable cause and requests the police to investigate under his command.

There is also a separate equivalent to the US general attorney, the "fiscal general del estado", which can investigate and present a case in front of a judge, representing the state. He is not investigating the accident.

Last edited by justme69; 29th Aug 2008 at 11:01.
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Old 29th Aug 2008, 09:44
  #1219 (permalink)  
 
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Quote:
"long ago I suggested to my airline that we set flaps prior to leaving the gate area and have a visual confirmation by the mechanic in charge of pushback."

The answer was No Way, as you might hit something on your way out to the active rwy.
I was always taught that the reason you always taxi flaps zero is to avoid contamination by dirt, sludge or mud and the risk of foreign object damage to either the flaps or the stuff inside the wing. Wasn't there a case where foreign objects blown back by an engine lodged somewhere in the flap mechanism, blocking it?

Last edited by deltayankee; 29th Aug 2008 at 09:53. Reason: corrected for clarity of quoted quote
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Old 29th Aug 2008, 09:55
  #1220 (permalink)  
 
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19 more pictures of the accident:

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