incidenti poco conosciuti


#1

volevo chiedere lumi a tutti voi…

a parte i disastri Challenger e Columbia,
sto facendo una ricerca su incidenti riguardanti il progetto Space Shuttle.
Ho trovato notizie nel forum a proposito della missione STS-27 e del deragliamento del treno con i SRB per le STS-120 e STS-122 (qualcuno ha delle foto di qualità decente per caso?.. in internet ne ho trovate solo “a quadrettoni”…).

qualcuno può segnalarmi qualcos’altro?.. se ci sono stati ad esempio incidenti durante le manovre all’interno del VAB, durante il carico della stiva, o cose del genere?

grazie mille!!!


#2

Beh si, ce ne sono stati e anche parecchi e gravi come nel '81 quando morirono due persone nella “pancia” del Columbia per anossia durante la preparazione al lancio di STS-1.
Qui per maggiori info:
http://en.wikipedia.org/wiki/Space_accidents_and_incidents


#3

scusa Alby, vado a memoria, ma non morirono per una perdita d’azoto i due tecnici al pad?


#4

Si, non mi pare però per una perdita accidentale ma la saturazione dell’ambiente volutamente per evitare concentrazioni pericolose di ossigeno o idrogeno, morirono per anossia, in gergo medico è errato questo termine?


#5

no è giustissimo, la mia domanda (forse formulata male) era rivolta al chiedere se si parlava dello stesso incidente.
In termine medico la morte dovuta ad ambiente saturo d’azoto equivale ad un annegamento, c’è una sostanza che impedisce lo scambio d’ossigeno.


#6

Sempre legato ad STS 1 c’è la mancata esplosione al momento del lancio dovuta all’onda durto dei motori riflessa dalla rampa che non era ben realizzata. Il difetto della rampa fu rilevato e sistemato ed STS 2 partì senza problemi.
Una missione fu interrotta perchè la toilettes di bordo s’era guastata e gli astronauti fluttuavano in cabina insieme ai loro escrementi.
C’è la perdita d’idrogeno durante la salita nel primo volo della Collins come comandante. Perdita così grave da far temere l’esplosione o il primo volo abortito al decollo.
Un altra volta il conto alla rovescia fu spospeso sullo 0 perchè i computers di bordo avevano rivelato un’anomalia.
Il picchio che cercava parassiti bucando la protezione termica del serbatoio centrale.
La rottura del filo del tethred ed il precedente del bullone.
Ancora STS 1 con gli astronauti che non riuscivano a regolare la temperatura interna della cabina.
Un astronauta in EVA che si ferì ad un dito per la rottura del guanto interno.
I finestrini e la protezione termica più volte centrati da frammenti spaziali.
Altre info le puoi trovare su Astronautix, c’è un articolo sugli incidenti spaziali in genere. Oppure credo che dovresti cercare notizie su qualche notiziario americano con sede nei dintorni di K.C., visto che molto personale vive in zona e ciò che succede lì poi diventa argomento di discussione.


#7

Questa non l’avevo mai sentita di quale missione si tratta? :skull:


#8

Con il tempo mi arrivano altri ricordi, come quello di alcuni addetti a cui scapparono di mano degli attrezzi da lavoro che hanno colpito la navetta, con il risultato che alcuni ispettori hanno dovuto verificare se c’era stato danno e quanto fosse grave, rischiando di far slittare il lancio. Quella della toilettes non ricordo quale fosse, così come le altre.
E chisà cosa non ce ne racconterebbe qualche dipendente NASA…


#9

Preso dal sito di Wayne Hale
http://blogs.nasa.gov/cm/blog/waynehalesblog.blog/posts/index_2.html

In questa missione (STS-33) si ruppe la toilette. Ma non so se sia la stessa a cui vi riferivate voi.

Thanksgiving Memories
Posted on Nov 24, 2009 08:44:29 AM | Wayne Hale
The shuttle is in flight once again this Thanksgiving Day, not the first time a holiday has come during a shuttle flight. My station friends remind me that they fly 24/7/365 and Christmas is really just GMT day 359. But when the shuttle is flying during Thanksgiving, I am always reminded of one significant day:
STS-33 was one of those classified DoD shuttle flights we can’t really talk about. But I don’t think I’ll be in any trouble with security over this mostly true story. I was the Orbit 1 team Flight Director and the shift schedule called for my team to be on console about noon. We had a big family Thanksgiving meal early that year (a real challenge for my wife). Satiated with turkey, all the trimmings, and pie, I arrived at the MCC to start handover from the planning team lead by Rob Kelso. We were expecting a really quiet shift.
Falcon Flight gave me the big news before I even plugged my headset into the console: “Potty is broken!” Sigh. Flight Directors spent hundreds of hours studying the various systems: engines, fuel cells, navigation. Everybody’s least favorite system was not working. “If we don’t get it fixed, the crew will have to break out the Apollo bags” Rob continued. If you don’t know what an Apollo bag is, well . . . let’s just say that you really didn’t really want to know. It’s a big plastic bag with sticky substance on the lip which you apply to your . . . anatomy . . . to take care of your . . . business. Not glamorous.
Fixing the potty is not exactly the kind of problem you want to work on following a big meal.
So MC finished team handover, got a few sketchy details from the crew, and set to work to see how the “Waste Management Collection System” could be fixed.
It wasn’t until the post flight debriefings that we heard what really transpired onboard. Story Musgrave, raconteur extraordinaire, was an eyewitness. It seems that the victim of the WCS failure was the commander, Fred Gregory.
First, you must have a primer on how to go to the bathroom in space (every schoolboy’s favorite subject). The lack of gravity means that everyday earth based technology does not work. Early efforts were primitive (reference the discussion of the Apollo bags above). #1 might be easily taken care of, but #2 is a much bigger problem (Pardon me here, my vocabulary is influenced by the recent effort to get my grandchildren potty trained here on earth). Without gravity the . . . waste material . . . tends not be removed from the body. The shuttle potty deals with this mainly by airflow. A very small opening in the toilet (much smaller than earth based toilets) allows just the critical part of . . . your anatomy . . . to fit precisely over the hole. There is a famously closed circuit TV in the WCS trainer at JSC’s building 5 to help astronauts learn how to correctly position themselves. Flight Directors did not have to go through this little indignity during our training. In early WCS designs, there was a complicated mechanism down that hole called the “slinger/shredder” which was pretty descriptive of its intent. The astronaut office objected to having a high RPM mechanical device so close to . . . . their person . . . and tests showed that the “slinger/shredder” probably wouldn’t work well, so the design got changed early in the shuttle. Now the toilet just uses airflow to do what gravity does here on earth. One sits in the WCS compartment with your feet in stirrups and a lap belt to hold you down. Once correctly positioned, the victim uses a handle much like an automobile gear shift lever to start the mechanism. First pull on the lever closes the vacuum valve – all the odors in the quiescent potty are sucked out through the orbiter’s overboard vent system. Second pull on the lever opens the “slider valve” just under the seat and that means the toilet is open for . . . business. Next pull starts a small fan which circulates air to help with . . . removal. When you are done, reversing the gear shift lever first turns off the fan, then closes the slider valve, and finally opens the vacuum vent. In that order.
Some quirk of sadistic spacecraft design required that all the air coming into the space shuttle crew compartment comes in through the “roof” of the WCS compartment. Normally there is very little makeup air required, but when the pressure falls slightly due to the natural leakage of the crew compartment, makeup air flows in through automatic valve outlets. A sophisticated system automatically keeps track of whether the makeup gas should be oxygen or nitrogen, the desire being to maintain a sea level atmosphere composition and pressure. Since the crew breaths in oxygen (and the exhaled carbon dioxide is removed elsewhere), the makeup gas is usually oxygen. The cryogenic oxygen tanks in the payload bay feed both the fuel cells and breathing air. The liquid oxygen from the tanks must be warmed to become a gas, but it still comes out very cold in the WCS compartment.
So during crew sleep early Thanksgiving morning, Fred Gregory had to do what comes naturally. All was well until (as) he moved the gear shifter to close up the WCS. Story related what happened next with great relish. Unfortunately, somewhere in the mechanism, the slider valve failed to close - but the vacuum vent was opened up! Depressurization! You can imagine what it would be like to be strapped down, have the suction of pure space applied to . . . . your person . . . , have a rush of cold oxygen burst in over your head, and the depress Klaxon alarm going off simultaneously.
Story opened the WCS door and together they got the mechanism to close the slider valve, and then got Fred off the seat.
Of course the whole crew was awakened by this commotion and John Blaha, the pilot, was starting to work the emergency procedure for cabin leak.
The immediate danger passed, but Mission Control was now on the radio and wanted to know what happened. A much abbreviated narrative was received. Needless to say, not much sleep was had for the remainder of the crew sleep period. And the bathroom was definitely closed for maintenance.
On the ground, MCC called in the engineering team that designed and tested the WCS (remember, it’s a holiday and most folks were just then sitting down to the Big Meal!) We got a crew of techs to open up one of the WCS units on the ground. Meanwhile, the flight controllers studied systems schematics and flight rules. We all pondered how to make the thing work. The IFM (in-flight-maintenance) guys came to our rescue. By removing the cover from the front of the device and applying vise grip pliers to an appropriate lever, the potty could be used without depressurizing the cabin again.
Whew. Problem solved. That’s what MCC is there for.
Every Thanksgiving now, sometime after the pie and before the football game/nap, I chuckle as I remember that episode. And give thanks for 1 G and three toilets in my house.
A few days later, Fred Gregory tried to land the shuttle like he did the T-38 . . . but that is another story for another day . . . .

Happy Thanksgiving!

#10

Titolo dell’avventura: come scoraggiare le persone a diventare astronauta! :skull:


#11

Quanti incidenti colpirono space shuttle ina persona che sopraviverbe orasarrebe cosi :face_with_head_bandage:


#12

Anche MM parla di un problema col WCS, ma non mi sembra fosse ne quello di STS-33 ne quello di STS-46, dato che c’entrava un part-timer…


#13

Eh, e ci lascia cosi’ in sospeso?


#14

Forse si riferisce a questo:

USAF helicopter pilot who would fly his T-38 trainer at alarmingly low altitude during cross-country trips. Paradoxically later appointed NASA Administrator for Safety.

Tratto da qua:
http://www.astronautix.com/astros/gregory.htm


#15

Senza aprire un nuovo topic, mi sono imbattuto in questo articolo che parla di un pipistrello decollato assieme allo Shuttle attaccato all’ET. E’ la missione STS-119, e ne parla anche la NASA. Non è un vero incidente, però è sicuramente un fatto ben curioso.


#16

Poverino, magari era solo rimasto impigliato nel rivestimento dell’ET. Strano che con tutti i mezzi per tenere lontani gli uccelli, non abbiano pensato a qualcosa per i pipistrelli, che in un parco dovrebbero abbondare. A quanto si legge i pipistrelli hanno avuto la fortuna di potersi aggrappare alle navette. Chi di noi non li invidierebbe?


#17

Ne abbiamo parlato anche noi all’epoca nel mission log di STS-119