Giusto con tutta la riservatezza che gira attorno all F-22 mi sembra strano già che abbiano dato questa notizia, anche perchè non vogliono incrinare la figura del bestione purosangue americano quale è il Raptor...
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F-22 fleet grounded Oxygen failure
#42
Scritto il 11 ottobre 2011 - 20:48
pensare che per un problema simile l' US NAVY ha avuto 64 incidenti e 2 morti (fra il 2002 e 2009) parlando degli F-18, ma il problema l'hanno risolto. Che non sia che la risoluzione al problema per questo sistema di "filtraggio" dell'aria (quello del F22) possa compromettere (anche se sinceramente non comprendo come) qualcosa nell'efficienza di altri apparati a bordo???
il sistema in schema
il sistema in schema
Questo messaggio è stato modificato da Andrea STPP: 11 ottobre 2011 - 20:53
#43
Scritto il 12 ottobre 2011 - 10:40
Mmm non ti seguo...intendi dire che questo mal funzionamento al sistema per l'ossigeno causi altri danni all'avionica o cose del genere?
#44
Scritto il 12 ottobre 2011 - 12:08
credo intenda dire che le varie soluzioni studiate siano incompatibili........... macchina assai complessa l'F-22
#45
Scritto il 13 ottobre 2011 - 06:18
I sistemi OBOG hanno dato problemi non solo sull'F-22, ma anche su molti altri velivoli (tra cui anche i CV-22 Osprey che tra l'altro avevano anche problemi ulteriori di pressurizzazione) quindi non è che l'F-22 sia più o meno complesso: tutti i velivoli moderni sono macchine complesse. Il fatto è poi che l'F-22 ha altissime prestazioni di manovrabilità, quota e velocità, nonchè un ruolo di primissimo piano nella difesa aerea strategica del territorio statunitense, per cui forse i problemi all'F-22 rappresentano un problema particolarmente importante e "sensibile" per gli americani.
Il sistema obog del Raptor dovrebbe essere prodotto dalla Honeywell.
Quello che da profano io trovo strano è che il Raptor vola in pratica da 20 anni ormai, per cui si sono accorti adesso dei problemi con l'obog, o questo sistema è stato aggiunto in seguito?
Il sistema obog del Raptor dovrebbe essere prodotto dalla Honeywell.
Quello che da profano io trovo strano è che il Raptor vola in pratica da 20 anni ormai, per cui si sono accorti adesso dei problemi con l'obog, o questo sistema è stato aggiunto in seguito?
Questo messaggio è stato modificato da Vultur: 13 ottobre 2011 - 06:25
#46
Scritto il 14 ottobre 2011 - 14:04
Mustanghino, su 12 ottobre 2011 - 12:08, ha detto:
credo intenda dire che le varie soluzioni studiate siano incompatibili........... macchina assai complessa l'F-22 
esattamente quello che ho ipotizzato ma ripeto: del raptor penso di saperne meno di voi..
Quota
Quello che da profano io trovo strano è che il Raptor vola in pratica da 20 anni ormai, per cui si sono accorti adesso dei problemi con l'obog, o questo sistema è stato aggiunto in seguito?
Allora ho dato un'occhiata su internet e ho trovato una descrizione del' YF-22 (quindi addirittura del prototipo) su un sito americano datata 01/2001 e il sistema per produzione d'ossigeno è lo stesso..OBOGS.. e proprio come hai detto Vultur..è parecchio strana la faccenda ma ripeto.. ne so meno di voi
#47
Scritto il 22 ottobre 2011 - 07:14
Ci risiamo ....
.... dal "Daily Report" del 21 Ottobre (AFA - U.S. Air Force Association) ....
Links ....
(1) .... http://www.foxnews.c...oxygen-problem/
(2) .... http://www.airforce-...FlightPlan.aspx
.... dal "Daily Report" del 21 Ottobre (AFA - U.S. Air Force Association) ....
Quota
BREAKING NEWS
Langley-Eustis Raptors Grounded, Again:
Air Force officials at JB Langley-Eustis, Va., have once again grounded the base's F-22 fleet after Raptor pilots experienced hypoxia-like symptoms.
Fox News reported (1) one such incident that occurred during a training flight.
Air Force headquarters spokesman Maj. Chad Steffey told the 'Daily Report' Friday that "the pilots are fine."
The standdown of the 1st Fighter Wing's F-22s comes almost exactly one month after Air Combat Command lifted the fleet-wide F-22 grounding (2), which lasted more than four months as officials tried to determine what was causing pilots to experience symptoms akin to insufficient oxygen supply in flight.
"As the Air Force Chief of Staff has said with respect to the decision to return F-22s to flight operations, there is no conclusive cause or group of causes that has been established for the incidents that promoted the standdown earlier this year," ACC spokeswoman Capt. Jennifer Ferrau told the 'Daily Report' Friday.
"Part of our protocol is to allow units to pause operations whenever they need to analyze information collected from flight operations to ensure safety.
That is what is happening at Langley at the moment, and we support that decision," she added.
There have been more than 1,300 Raptor missions since the F-22s returned to flight last month, said Ferrau.
—Amy McCullough
Langley-Eustis Raptors Grounded, Again:
Air Force officials at JB Langley-Eustis, Va., have once again grounded the base's F-22 fleet after Raptor pilots experienced hypoxia-like symptoms.
Fox News reported (1) one such incident that occurred during a training flight.
Air Force headquarters spokesman Maj. Chad Steffey told the 'Daily Report' Friday that "the pilots are fine."
The standdown of the 1st Fighter Wing's F-22s comes almost exactly one month after Air Combat Command lifted the fleet-wide F-22 grounding (2), which lasted more than four months as officials tried to determine what was causing pilots to experience symptoms akin to insufficient oxygen supply in flight.
"As the Air Force Chief of Staff has said with respect to the decision to return F-22s to flight operations, there is no conclusive cause or group of causes that has been established for the incidents that promoted the standdown earlier this year," ACC spokeswoman Capt. Jennifer Ferrau told the 'Daily Report' Friday.
"Part of our protocol is to allow units to pause operations whenever they need to analyze information collected from flight operations to ensure safety.
That is what is happening at Langley at the moment, and we support that decision," she added.
There have been more than 1,300 Raptor missions since the F-22s returned to flight last month, said Ferrau.
—Amy McCullough
Links ....
(1) .... http://www.foxnews.c...oxygen-problem/
(2) .... http://www.airforce-...FlightPlan.aspx
#48
Scritto il 24 ottobre 2011 - 14:54
Ed ora tocca all'Alaska ....
.... dal "Daily Report" del 24 Ottobre (AFA - U.S. Air Force Association) ....
Link .... (*) .... http://www.adn.com/2...ights-over.html
.... dal "Daily Report" del 24 Ottobre (AFA - U.S. Air Force Association) ....
Quota
Virginia-based F-22s Grounded Again, Alaska Base Follows:
The 1st Fighter Wing at JB Langley-Eustis, Va., last week stood down the base's F-22s after a reported incident in which a Raptor pilot experienced hypoxia-like symptoms in flight, the same type of issue that led to the standdown of USAF's entire F-22 fleet earlier this year.
The incident occurred at Langley-Eustis on Oct. 20, reported WTKR of Norfolk, Va.
As a precaution, officials with the 3rd Wing at JB Elmendorf-Richardson, Alaska, followed suit and temporarily grounded their two combat-ready Raptor squadrons, reported (*) the Anchorage Daily News.
Air Force headquarters spokesman Maj. Chad Steffey told the Daily Report on Oct. 21 that "the pilots are fine."
The standdown of the two wings' F-22s comes almost exactly one month after Air Combat Command lifted the fleet-wide F-22 grounding that lasted more than four months as officials worked to determine what's been causing Raptor pilots to experience symptoms akin to insufficient oxygen supply in numerous incidents since 2008.
Service offficials have not identified the cause yet, but allowed flights to resume in September after instituting enhanced safety measures to monitor the F-22 pilots.
"Part of our protocol is to allow units to pause operations whenever they need to analyze information collected from flight operations to ensure safety.
That is what is happening at Langley at the moment, and we support that decision," ACC spokeswoman Capt. Jennifer Ferrau told the Daily Report.
—Amy McCullough
The 1st Fighter Wing at JB Langley-Eustis, Va., last week stood down the base's F-22s after a reported incident in which a Raptor pilot experienced hypoxia-like symptoms in flight, the same type of issue that led to the standdown of USAF's entire F-22 fleet earlier this year.
The incident occurred at Langley-Eustis on Oct. 20, reported WTKR of Norfolk, Va.
As a precaution, officials with the 3rd Wing at JB Elmendorf-Richardson, Alaska, followed suit and temporarily grounded their two combat-ready Raptor squadrons, reported (*) the Anchorage Daily News.
Air Force headquarters spokesman Maj. Chad Steffey told the Daily Report on Oct. 21 that "the pilots are fine."
The standdown of the two wings' F-22s comes almost exactly one month after Air Combat Command lifted the fleet-wide F-22 grounding that lasted more than four months as officials worked to determine what's been causing Raptor pilots to experience symptoms akin to insufficient oxygen supply in numerous incidents since 2008.
Service offficials have not identified the cause yet, but allowed flights to resume in September after instituting enhanced safety measures to monitor the F-22 pilots.
"Part of our protocol is to allow units to pause operations whenever they need to analyze information collected from flight operations to ensure safety.
That is what is happening at Langley at the moment, and we support that decision," ACC spokeswoman Capt. Jennifer Ferrau told the Daily Report.
—Amy McCullough
Link .... (*) .... http://www.adn.com/2...ights-over.html
#49
Scritto il 25 ottobre 2011 - 13:11
Aggiornamenti ....
.... dal "Daily Report" del 25 Ottobre (AFA - U.S. Air Force Association) ....
.... però .... secondo il sito di "Flight International" gli F-22 "alaskani" avrebbero ripreso a volare ....
.... dal "Daily Report" del 25 Ottobre (AFA - U.S. Air Force Association) ....
Quota
At Least It's Not the Full Fleet:
So far only JB Langley-Eustis, Va., and JB Elmendorf-Richardson, Alaska, have "paused" F-22 flight operations, after two Virginia-based Raptor pilots exhibited hypoxia-like symptoms last week.
The other bases where F-22s regularly operate—Edwards AFB, Calif., Holloman AFB, N.M., Nellis AFB, Nev., and Tyndall AFB, Fla.—continue to conduct normal flight operations, although each base's commander is following the issue closely, Lt. Col. John Haynes, an Air Force headquarters spokesman told the Daily Report Monday.
"It's going to be up to the wing commanders to decide how long to take a pause," said Haynes.
The Oct. 20 incidents at Langley-Eustis and the subsequent standdowns at the Virginia and Alaska bases occurred roughly one month after Air Combat Command lifted the fleet-wide F-22 grounding that took effect in May due to concerns over pilots exhibiting these same symptoms in some 12 cases going back to 2008.
So far only JB Langley-Eustis, Va., and JB Elmendorf-Richardson, Alaska, have "paused" F-22 flight operations, after two Virginia-based Raptor pilots exhibited hypoxia-like symptoms last week.
The other bases where F-22s regularly operate—Edwards AFB, Calif., Holloman AFB, N.M., Nellis AFB, Nev., and Tyndall AFB, Fla.—continue to conduct normal flight operations, although each base's commander is following the issue closely, Lt. Col. John Haynes, an Air Force headquarters spokesman told the Daily Report Monday.
"It's going to be up to the wing commanders to decide how long to take a pause," said Haynes.
The Oct. 20 incidents at Langley-Eustis and the subsequent standdowns at the Virginia and Alaska bases occurred roughly one month after Air Combat Command lifted the fleet-wide F-22 grounding that took effect in May due to concerns over pilots exhibiting these same symptoms in some 12 cases going back to 2008.
.... però .... secondo il sito di "Flight International" gli F-22 "alaskani" avrebbero ripreso a volare ....
Quota
Alaskan F-22As resume flying but others still grounded
Stephen Trimble
Washington DC (15 hours ago)
Source:
About 40 of the US Air Force’s Lockheed Martin F-22A Raptors have returned to flight status at Joint Base Elmendorf-Richardson (JBER) in Alaska following a new, four-day grounding event.
But 30 more F-22As remain parked at another base as concerns linger over mysterious life support system problems that have sometimes proved a critical risk to pilots for more than two years.
JBER confirms all 40 F-22As based in Alaska were cleared by local commanders to resume flying on 24 October. Its Raptors had been grounded since 20 October in a “temporary pause” triggered by reports of life support system problems at Langley AFB, Virginia.
About 30 F-22As at Langley remain grounded as base officials continue to investigate the source of the latest life support system malfunction, which reportedly left one pilot light-headed.
Flight operations for the F-22A fleet are made at the discretion of base commanders. So far, only the JBER F-22As were grounded as a result of the incident at Langley. The US Air Combat Command confirms that no other aircraft besides Langley’s are stood-down for safety reasons.
Meanwhile, a panel led by retired General Greg Martin is continuing to assess the safety of life support systems, including onboard oxygen generation systems (OBOGS), for several USAF combat aircraft types, including the F-22A and Lockheed F-35A. Martin’s panel is scheduled to release a public version of their assessment in November, according to the USAF.
Earlier this year, the air force grounded all its F-22As for four months to investigate several reports of pilots suffering from hypoxia-like symptoms. An intensive investigation failed to identify the source of the problems, or even replicate the conditions experienced by pilots on some missions.
The USAF returned the fleet to flight status on 21 September, but imposed a new set of safety procedures and continued monitoring of pilots’ health.
The F-22A fleet has flown more than 1,300 missions since the return to flight order was approved about one month ago.
Stephen Trimble
Washington DC (15 hours ago)
Source:

About 40 of the US Air Force’s Lockheed Martin F-22A Raptors have returned to flight status at Joint Base Elmendorf-Richardson (JBER) in Alaska following a new, four-day grounding event.
But 30 more F-22As remain parked at another base as concerns linger over mysterious life support system problems that have sometimes proved a critical risk to pilots for more than two years.
JBER confirms all 40 F-22As based in Alaska were cleared by local commanders to resume flying on 24 October. Its Raptors had been grounded since 20 October in a “temporary pause” triggered by reports of life support system problems at Langley AFB, Virginia.
About 30 F-22As at Langley remain grounded as base officials continue to investigate the source of the latest life support system malfunction, which reportedly left one pilot light-headed.
Flight operations for the F-22A fleet are made at the discretion of base commanders. So far, only the JBER F-22As were grounded as a result of the incident at Langley. The US Air Combat Command confirms that no other aircraft besides Langley’s are stood-down for safety reasons.
Meanwhile, a panel led by retired General Greg Martin is continuing to assess the safety of life support systems, including onboard oxygen generation systems (OBOGS), for several USAF combat aircraft types, including the F-22A and Lockheed F-35A. Martin’s panel is scheduled to release a public version of their assessment in November, according to the USAF.
Earlier this year, the air force grounded all its F-22As for four months to investigate several reports of pilots suffering from hypoxia-like symptoms. An intensive investigation failed to identify the source of the problems, or even replicate the conditions experienced by pilots on some missions.
The USAF returned the fleet to flight status on 21 September, but imposed a new set of safety procedures and continued monitoring of pilots’ health.
The F-22A fleet has flown more than 1,300 missions since the return to flight order was approved about one month ago.
#50
Scritto il 26 ottobre 2011 - 15:29
L'F-22 torna a volare.
Siamo lontani da una soluzione, ma la flotta continuerà ad essere monitorata per raccogliere dati utili alla risoluzione del problema.
Siamo lontani da una soluzione, ma la flotta continuerà ad essere monitorata per raccogliere dati utili alla risoluzione del problema.
#51
Scritto il 27 ottobre 2011 - 22:42
E' confermato .... volano di nuovo ....
.... dal "Daily Report" del 27 Ottobre (AFA - U.S. Air Force Association) ....
.... dal "Daily Report" del 27 Ottobre (AFA - U.S. Air Force Association) ....
Quota
Raptors Return to Flight:
The Air Force's F-22s are flying again, officials at JB Langley-Eustis, Va., and JB Elmendorf-Richardson, Alaska, told the Daily Report Wednesday.
Both bases temporarily grounded their Raptor fleets last week after two Virginia-based pilots experienced hypoxia-like symptoms during a training sortie on Oct. 20.
Alaska's aircraft were up and flying again Monday.
Officials there temporarily paused operations over the weekend as a precaution following the incident in Virginia, a base spokesman told the Daily Report.
The restriction on Langley-Eustis' aircraft was lifted by 8:00 a.m. on Tuesday US East Coast time and the F-22s are once again flying the "same number of sorties as before the brief pause," said Monica Miller Rodgers, a spokeswoman with the joint installation's 633rd Air Base Wing.
Raptor pilots are not operating under any new restrictions.
However, "the commander continues to closely monitor operations," said Miller Rodgers.
The Air Force declined to release any additional information on the Oct. 20 incident, saying officials continue to analyze it.
—Amy McCullough
The Air Force's F-22s are flying again, officials at JB Langley-Eustis, Va., and JB Elmendorf-Richardson, Alaska, told the Daily Report Wednesday.
Both bases temporarily grounded their Raptor fleets last week after two Virginia-based pilots experienced hypoxia-like symptoms during a training sortie on Oct. 20.
Alaska's aircraft were up and flying again Monday.
Officials there temporarily paused operations over the weekend as a precaution following the incident in Virginia, a base spokesman told the Daily Report.
The restriction on Langley-Eustis' aircraft was lifted by 8:00 a.m. on Tuesday US East Coast time and the F-22s are once again flying the "same number of sorties as before the brief pause," said Monica Miller Rodgers, a spokeswoman with the joint installation's 633rd Air Base Wing.
Raptor pilots are not operating under any new restrictions.
However, "the commander continues to closely monitor operations," said Miller Rodgers.
The Air Force declined to release any additional information on the Oct. 20 incident, saying officials continue to analyze it.
—Amy McCullough
#52
Scritto il 04 dicembre 2011 - 09:52
La messa a terra degli F-22 .... un grosso guaio per i piloti .... una vera manna per i "manutentori" .....
Un lungo ed interessante articolo apparso sull'ultimo numero del mensile "Air Force Magazine" (organo ufficiale dell' U.S. Air Force Association) ....
http://www.airforce-...1211raptor.aspx
.
Un lungo ed interessante articolo apparso sull'ultimo numero del mensile "Air Force Magazine" (organo ufficiale dell' U.S. Air Force Association) ....

http://www.airforce-...1211raptor.aspx
.
#53
Scritto il 04 dicembre 2011 - 20:18
Intanto slitta di alcuni mesi il rilascio del rapporto del comitato scientifico ....
http://www.flightglo...-months-365356/
Quota
The US Air Force has extended by several months a self-imposed deadline for releasing a scientific analysis of the oxygen problems blamed for two groundings of the Lockheed Martin F-22A Raptor.
http://www.flightglo...-months-365356/
#54
Scritto il 14 dicembre 2011 - 23:05
Da
.... ci sono novità ....
"F-22 oxygen system malfunctioned moments before crash" ....
http://www.flightglo...e-crash-366028/
.... ci sono novità ...."F-22 oxygen system malfunctioned moments before crash" ....
http://www.flightglo...e-crash-366028/
#55
Scritto il 14 dicembre 2011 - 23:29
Da
....
Qui trovate anche un link con il testo del rapporto ....
http://www.flightglo...inally-exp.html
....Qui trovate anche un link con il testo del rapporto ....
http://www.flightglo...inally-exp.html
#56
Scritto il 14 dicembre 2011 - 23:35
mi pare strano...il ghiaccio nel carburante,,,e trale la escludo al 98% perchè sia il jp-4; jp8 ...alias f34; f-40 ecc...hanno una componente antighiaccio oltre -40°C.....
semmai è più probabile che; sia stato il fenomeno del carburante inquinato...da acqua; che dopo tempo si trasforma in acido solforico.....e corrode le tubatire; guarnizioni....anche perchè il motore avio ..ha il funzionamento garantito con anche in circa il 40% di acqua respirata dal compressore...
comunque il fenomeno del ghiaccio al carburante ....mi suona altamente improbabile.....
semmai è più probabile che; sia stato il fenomeno del carburante inquinato...da acqua; che dopo tempo si trasforma in acido solforico.....e corrode le tubatire; guarnizioni....anche perchè il motore avio ..ha il funzionamento garantito con anche in circa il 40% di acqua respirata dal compressore...
comunque il fenomeno del ghiaccio al carburante ....mi suona altamente improbabile.....
#57
Scritto il 16 dicembre 2011 - 09:25
Secondo l'Air Force, è del pilota la colpa di uno degli incidenti occorsi all'aereo per mancanza di ossigeno, con la perdita di pilota e aereo.
La colpa del pilota è di aver focalizzato la sua attenzione sulla mancanza d'ossigeno, anzichè cercare di riprendere l'aereo.
Fonte ABC News
La colpa del pilota è di aver focalizzato la sua attenzione sulla mancanza d'ossigeno, anzichè cercare di riprendere l'aereo.
Fonte ABC News
#58
Scritto il 07 marzo 2012 - 16:36
Ma il CSM dell'USAF solleva il pilota dalla responsabilità dell'incidente ....
http://www.flightglo...2-crash-369194/
http://www.flightglo...2-crash-369194/
#60
Scritto il 16 marzo 2012 - 14:39
La moglie del pilota deceduto intenta un'azione legale nei confronti delle aziende costruttrici dell'aereo ....
http://www.flightglo...s-widow-369479/
http://www.airforce-...craftMaker.aspx
http://www.flightglo...s-widow-369479/
http://www.airforce-...craftMaker.aspx

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