| keitaro | 06-01-2009 09:18 PM | Quote:
Originally Posted by Timpo
(Post 6446331)
|
that is out dated information. The new ELT frequency is 406MHz. It was changed last year. Quote:
Originally Posted by Timpo
(Post 6446588)
also from my understanding, aircrafts are lightening proof, it could damage some electricals, but that's only for few seconds...
if they can find a black box I guess NTSB can find what went wrong. | Planes are not lightning proof. Planes are designed to withstand a direct lightning strikes of certain proportion. Usually there will be an entry and exit. There are times where there would be an entry strike, and no exit strike (lighting strike inspections are done, after a plane has been know to have been hit). If the lightning strike has enough power, it can/may do damage to the aircraft electrical systems. Most avionics on the airplane are very very sensitive, and easily damaged by static, let alone lightning.
Most major components (and composite panels) are grounded. Ground wire varies depending on what the component is. During maintenance, where a component should be grounded, a bonding check is done to determine if the component is bonded to within design limits.
In this situation, the airbus is all fly-by-wire, and a direct hit to it's flight control systems, the surge in electricity could fry a flight control system(such as a power control unit), or engine control system. Even with a deployment of a RAT, the system could have been fatally damaged by the strike and become U/S.
Reports on the news says that the plane was flying in an area know for sever thunderstorms. With a large enough strike, there might have not been enough bonding to handle the large amount of current going through.
Also I don't think NTSB will be leading the investigation. Most likely it would be the Brazilian government or EASA(since its a European built aircraft, and European carrier). . |