Snapzzz wrote:
Tony_H wrote:
But that plane will not take off if it is not safe to do so.
If only that were true.
Tell that to the passengers of Japan Airlines flight 123
Tell that to the passengers of American Airlines Flight 191
The fact is that planes DO take off in unsafe conditions, history tells us this. Both the cited examples are botched maintenance and whilst humans maintain aircraft then you are always going to be at the mercy of these technicians.
You are correct in saying flying is really safe, i agree. But to say that unsafe planes do not fly is simply wrong or we would not get crashes like these.
JAL123 was back in 1985 - a lot has been learned from that accident. If you know about these disasters, you will be aware that this aircraft wasd previously involved ina tail strike incident - something that VERY rarely ever happens. The repair of the rear bulkhead was botched by Boeing, at a time when the company was in financial trouble. The repair was said to be good for 10000 pressurisations, and this flight was number 12000 and something subsequently. When the bulkhead failed, it tore out the hydraulic lines - something that would not be expected, and thus the place was unable to be controlled. Boeing admitted responsibility, but it appears that JAL were not inspecting their planes sufficiently.
This accident led to a change in JAL inspections, a review of Boeing procedures for bulkhead replacements, and additional safeguards against the failure of the hydraulics. The whole rear tailplane was ripped off, yet the plane a 747 managed to fly for 32 minutes before crashing. There are not many disasters where 747s are involved, and you can always find an ISOLATED incident to show up things.
As for AA191, that was back in 1979 and involved the no longer flying DC10. In fact virtually all 3 engined passenger jets no longer fly. If I recall, this is where the left hand engined literally flew off over the wing on take off? I seem to remember that American Airlines took the option NOT to install a 2nd and additional stall warning system TO KEEP COSTS DOWN at the time - this is no longer an option available to any airline!
This was the 4th fatal accident involving the DC10, which had some serious design faults, and all stem back to the late 60s when aircraft manufacturers were trying to go bigger, faster, cheaper etc. 3 engined jets like the TriStar and DC10 were regarded as more economical yet capable of carrying up to 500 passengers.
Again in this scenario, improper maintenance was deemed to be at the cause. Yet again, the scenario involved taking out much of the hydralic system which led to a failure to control the aircraft, and something which was unprecedented at the time.
The engine in question was previously damaged and removed. The procedure for its removal and return to the wing were incorrect, and involved using a forklift truck. The airline did this to save time. This has now been outlawed, and AA have changed maintenance procedures.
I agree accidents happen, but there is ALWAYS chain of events, not one single incident. When they happen, they are usually catastrophic, but the number of accidents these days is less than ever, and procedures across the FAA are far greater than they used to be.
If I looked too closely at the A300 I flew on last week, I would worry about loose rivets, but I have confidence in the maintenance of that airline and the knowledge of that flight crew. You have to, dont you?