De nombreux ingénieurs aéro américains contestent la décision de la FAA d' abaisser le niveau de norme parafoudre du 787 qui connait des difficultés insurmontables à ce sujet.
Sur un autre forum aéro dont j' ai été viré pour non conformisme j' expliquais qu' à mon avis le 787 butait sur une impossibilité technique car seule une peau métallique peut écouler des décharges de très fortes intensité, un avion composite qui plus est avec des commandes électriques n' assure pas une protection suffisante.
Rappellez vous du DA 42 qui a explosé en vol au dessus du Massif Central dans un orage, quid du BEA dans cet accident ?
Je vous retrouve l' article US sur la protestation des ingénieurs et je vous la poste.
L' avenir du 787
Modérateur : Big Brother
-
Auteur du sujetJacques Lévêque - Chef de secteur posteur
- Messages : 1079
- Enregistré le : 27 juin 2009, 14:17
- Localisation : FRANCE
- Âge : 79
-
Auteur du sujetJacques Lévêque
- Chef de secteur posteur
- Messages : 1079
- Enregistré le : 27 juin 2009, 14:17
- Localisation : FRANCE
- Âge : 79
FAA to loosen fuel-tank safety rules, benefiting Boeing's 787
Boeing's 787 Dreamliner cannot meet the Federal Aviation Administration's current stringent standards for preventing sparks inside the fuel tank during a lightning strike, and the agency now calls those requirements "impractical" and proposes to loosen them.
By Dominic Gates
Seattle Times aerospace reporter
PREV of NEXT
Related
Proposed policy shift (PDF)
FAA lightning memo
Critique by National Air Traffic Controllers Association union
Grievance filed by the union
The Federal Aviation Administration (FAA) has quietly decided to loosen stringent fuel-tank safety regulations written after the 1996 fuel-tank explosion that destroyed flight TWA 800 off the coast of New York state.
The FAA proposes to relax the safeguards for preventing sparks inside the fuel tank during a lightning strike, standards the agency now calls "impractical" and Boeing says its soon-to-fly 787 Dreamliner cannot meet.
Instead of requiring three independent protection measures for any feature that could cause sparking, the revised policy would allow some parts to have just one safeguard.
Boeing has worked closely with the FAA to make the change in time for the 787 Dreamliner, whose airframe built of composite plastic makes lightning protection a special challenge.
But the move has stirred intense opposition inside the local FAA office from the technical specialists — most of them former Boeing engineers — responsible for certifying new airplane designs.
The national union representing about 190 Seattle-based FAA engineers this past Tuesday submitted a formal critique to the agency, calling the new policy "an unjustified step backward in safety."
In a lightning storm, the critique said, the less stringent rules could leave a commercial airliner "one failure away from catastrophe."
FAA management, contradicting its own technical staff, argues that relaxing the spark-prevention standard is balanced by new technology to reduce fuel-tank flammability that will increase safety overall.
And Boeing experts insist the 787 will be safer in a lightning storm than any jet flying today.
Jim Hall, the former National Transportation Safety Board (NTSB) chairman who oversaw the TWA 800 investigation, said he's disappointed in the FAA but not surprised.
"It appears that management has overruled the judgment of the people that have day-to-day responsibility for the safety of aircraft," Hall said.
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February 10, 2009 03:54 PM PST
Dominic Gates is the Aerospace reporter for The Seattle Times and he put a great story this week you want to read here. In it he refers to changing FAA rules about lightning strikes on a commercial jet. Read the FAA policy here. (Scroll down to the item titled: Policy on Issuance of Special Conditions and Exemptions Related to Lightning Protection of Fuel Tank Structure (it's currently the third item on the list) and click on "draft document.")
The story is that the FAA is relaxing the rules on lightning strikes - but it seems that numerous engineers within the FAA don't think this a great idea with a composite plane. These engineers might like to see the rules relaxed a bit - but not too much because there are so many questions about lightning strikes on composites. Dominic's call is something quite amazing to listen to.
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These podcasts are brought to you by Innovation Analysis Group. Our web site is at www.iag-inc.com Copyright applies to our content. Looking for older podcasts? Visit www.iag-inc.com/archive.html
Boeing's 787 Dreamliner cannot meet the Federal Aviation Administration's current stringent standards for preventing sparks inside the fuel tank during a lightning strike, and the agency now calls those requirements "impractical" and proposes to loosen them.
By Dominic Gates
Seattle Times aerospace reporter
PREV of NEXT
Related
Proposed policy shift (PDF)
FAA lightning memo
Critique by National Air Traffic Controllers Association union
Grievance filed by the union
The Federal Aviation Administration (FAA) has quietly decided to loosen stringent fuel-tank safety regulations written after the 1996 fuel-tank explosion that destroyed flight TWA 800 off the coast of New York state.
The FAA proposes to relax the safeguards for preventing sparks inside the fuel tank during a lightning strike, standards the agency now calls "impractical" and Boeing says its soon-to-fly 787 Dreamliner cannot meet.
Instead of requiring three independent protection measures for any feature that could cause sparking, the revised policy would allow some parts to have just one safeguard.
Boeing has worked closely with the FAA to make the change in time for the 787 Dreamliner, whose airframe built of composite plastic makes lightning protection a special challenge.
But the move has stirred intense opposition inside the local FAA office from the technical specialists — most of them former Boeing engineers — responsible for certifying new airplane designs.
The national union representing about 190 Seattle-based FAA engineers this past Tuesday submitted a formal critique to the agency, calling the new policy "an unjustified step backward in safety."
In a lightning storm, the critique said, the less stringent rules could leave a commercial airliner "one failure away from catastrophe."
FAA management, contradicting its own technical staff, argues that relaxing the spark-prevention standard is balanced by new technology to reduce fuel-tank flammability that will increase safety overall.
And Boeing experts insist the 787 will be safer in a lightning storm than any jet flying today.
Jim Hall, the former National Transportation Safety Board (NTSB) chairman who oversaw the TWA 800 investigation, said he's disappointed in the FAA but not surprised.
"It appears that management has overruled the judgment of the people that have day-to-day responsibility for the safety of aircraft," Hall said.
Podcasts Community Create a Podcast
IAGblog Podcasts
Nanocasting for the aviation and travel industry
Boeing's 787 and lightning strikes Send to Friends |
1 Comments 1 Comments 1 Comments | Download | Permalink
February 10, 2009 03:54 PM PST
Dominic Gates is the Aerospace reporter for The Seattle Times and he put a great story this week you want to read here. In it he refers to changing FAA rules about lightning strikes on a commercial jet. Read the FAA policy here. (Scroll down to the item titled: Policy on Issuance of Special Conditions and Exemptions Related to Lightning Protection of Fuel Tank Structure (it's currently the third item on the list) and click on "draft document.")
The story is that the FAA is relaxing the rules on lightning strikes - but it seems that numerous engineers within the FAA don't think this a great idea with a composite plane. These engineers might like to see the rules relaxed a bit - but not too much because there are so many questions about lightning strikes on composites. Dominic's call is something quite amazing to listen to.
About iagblog
View Profile
##Add as Friend
These podcasts are brought to you by Innovation Analysis Group. Our web site is at www.iag-inc.com Copyright applies to our content. Looking for older podcasts? Visit www.iag-inc.com/archive.html
-
Pomination
- Elève-pilote posteur
- Messages : 35
- Enregistré le : 09 juil. 2009, 22:19
- Localisation : Pierrelaye
- Âge : 52
je ne pense pas que ce soit aussi simple
car certifié aujourd hui le 787 en toutes connaissances de cause, le jour où une expolsion se produira et que le lien de cause a effet aura été démontré, les compagnies se retrouveront avec une flotte de 787 clouée au sol en attente de mofication(que technologiquement Boeing n a pas...)
alors quelles compagnies prendraient ce risque sachant qu il existe des concurrents au 787
peut etre que la FAA face à boeing peut baisser son froc mais je ne vois pas pourquoi l ' EASA le ferait
safety first! enfin j espère
ou alors, juste certifié beau temps
car certifié aujourd hui le 787 en toutes connaissances de cause, le jour où une expolsion se produira et que le lien de cause a effet aura été démontré, les compagnies se retrouveront avec une flotte de 787 clouée au sol en attente de mofication(que technologiquement Boeing n a pas...)
alors quelles compagnies prendraient ce risque sachant qu il existe des concurrents au 787
peut etre que la FAA face à boeing peut baisser son froc mais je ne vois pas pourquoi l ' EASA le ferait
safety first! enfin j espère
ou alors, juste certifié beau temps
Re: L' avenir du 787
Démasqué! Mais pour le coup Coffin soulève un sujet plus qu'intéressant, juste dans la mauvaise section. Voyons comment tout ça va évoluer et la puissance des lobbies. Rien sur Flight Global, du mois pas sur la version web, le sujet serait il plus que sensibleJacques Lévêque a écrit :Sur un autre forum aéro dont j' ai été viré pour non conformisme
-
Auteur du sujetJacques Lévêque
- Chef de secteur posteur
- Messages : 1079
- Enregistré le : 27 juin 2009, 14:17
- Localisation : FRANCE
- Âge : 79
-
LJ35 - Chef de secteur posteur
- Messages : 2082
- Enregistré le : 11 juil. 2001, 02:00
- Localisation : Paris
- Âge : 51
Quand on veut se dissimuler derrière un pseudo, on ne met pas sa photo comme le fait Tomcat, qui n'est aucunement anonyme.Jacques Lévêque a écrit :-Tomcat- a écrit :...et quel rapport avec ce forum ?
Vous regrettiez coffincorner ? en voilà un autre pas mal gratiné...Jacques Lévêque
Critiquer les petits camarades en se dissimulant derrière un pseudo c'est assez médiocre ....
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Adrioun
- Chef de secteur posteur
- Messages : 662
- Enregistré le : 24 janv. 2004, 01:00
- Localisation : LFLL
- Âge : 39
- Contact :
On peux arreter de critiquer en permanence c'est dingue.
Le sujet est interessant, mais vuq ue certains n'ont aucune contribution interessante, alors ils critiquent.
Certes le sujet est a la mauvaise place, mais il a sa place sur Aeronet et le debat en vaut la chandelle !
Le sujet est interessant, mais vuq ue certains n'ont aucune contribution interessante, alors ils critiquent.
Certes le sujet est a la mauvaise place, mais il a sa place sur Aeronet et le debat en vaut la chandelle !
'"Life is either a daring adventure or nothing !'"
Blog en NZ avec CTC : www.ctc-fcuk.tk
Blog en NZ avec CTC : www.ctc-fcuk.tk
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Adrioun
- Chef de secteur posteur
- Messages : 662
- Enregistré le : 24 janv. 2004, 01:00
- Localisation : LFLL
- Âge : 39
- Contact :
La relecture des quelques posts du sujet repondront a ta question.
Merci de continuer sur le sujet initial.
Merci de continuer sur le sujet initial.
'"Life is either a daring adventure or nothing !'"
Blog en NZ avec CTC : www.ctc-fcuk.tk
Blog en NZ avec CTC : www.ctc-fcuk.tk
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