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Yes, the aluminium alloy used in the construction of the fuselage, coupled together with the metallic skin of the aircraft acts as a form of Faraday cage that protects both living organisms and electronic equipments within the aircraft in the event of a direct lighting strike. In fact, lighting strikes to aircraft are quite a common occurrence that results in nothing more than a couple of thumb to fist size punctured entry and exit holes somewhere along the aircraft, and also maybe some damaged static discharge wicks, both of which can be easily fixed and repair.Generally I feel the notion that lightning forced the aircraft to crash very misleading. That aircraft model A330-200 is designed to withstand lightning strikes.
In fact, SIA also uses airbus A330 except is the 300 version.
Contrary to popular belief, the static discharge wicks along the flight control surfaces of a aircraft is meant to discharge any unwanted static buildup into the atmosphere that might otherwise cause unwanted noise and electrical interference to the radio equipments, rather than for lighting protection.
The quadruple, quintuple, or even more independent layers of fault-tolerant hardware and software within the Electronic Flight Control System (EFCS) and multiple flight control computers itself ensures an extremely high level of redundancy in the event any systems or sub-systems malfunction and is taken off-line for whatever reasons. Thus the reported "electrical circuit malfunction" message that was automatically created and send through ACARS could just be any small anomaly that routinely occurs throughout other flights as well.
Unless FDR & CVR are both recovered, it is extremely difficult to ascertain and determines what exactly had happened to the aircraft as it was flying through a region with no ATC and radar coverage (as with most oceans worldwide). It is very probable though, and as with most aviation incidents, a series of ill-fated events had occurred thus leading into a chain of events that ultimaltely that to the demise of the aircraft.However I think one of the main problems in Brazil is the lack of updated radar systems especially ground radar. I believe that the crew was not given updated weather information as most pilots do not generally like to go into areas of bad weather.
Airspace in Brazil is mainly controlled by air force personnel (who are very shorthanded) and not civilian personnel.
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