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The Latest: Lion Air jet had airspeed problem on 4 flights
The head of Indonesia's National Transportation Safety Committee, Soerjanto Tjahjono, says the "black box" data recorder from the crashed Lion Air jet shows its last four flights all had an airspeed indicator problem. (www.yahoo.com) 更多...Sort type: [Top] [Newest]
i'm a technician for a major airline here in Houston, TX. The first airspeed write up wuld have been addressed at the gate b4 passengers boarded with a a pitot-static pump up. Which simulates airspeed and altitude while on the ground. it wuld be corrected if a problem was found. if problem happened again this a/c wuld b grounded and wuld not have flown again until a potential problem was found and corrected by a maintenance action. no questions asked! shame on these foreign countries maintenance and airworthiness procedures.
Ground checks may have or not have been done. This was most likely an airborne issue and a ground check would say all good. After the second similar issue, the plane should have been grounded until the actual cause was found.
Unbelievable! 189 people dead - paying pax and crew! This amounts to criminal negligence on someone's part - Lion or Boeing ... or both!
There are three extremely important elements of aviation technology that are way behind the times and constitute more potential disasters in the offing: (1) Pitot tubes clogging with super cold ice or insects. Good old INS is not affected by these and should be installed as a back up (2) CVRs and DFRs not strong enough as they made us to believe so some investigations of accidents never got to pinpoint the causes; and (3) The so unreliable ELTs regargless whether they are of the garden variety installed on small GA aircraft or more expensive ones mounted on commercial jets. INCREDIBLE
I'm thinking with the LCD panel the perceived problem wasn't the root cause. Be it a hard landing from a storm or screw up I have to wonder if a rack mount snapped causing intermittent problems. Things do get worse over time if loose. I'd survey for plastic parts that might be improper for handling stresses like hard landings or handling. Even improper sized screws and blots have lead to disasters. I'm also wondering if the problem seemed to materialize around turns or turbulence. List goes on.
In dense air and slow speed you should be able to retain control and not let the aircraft stall. unless you ignore all warning signs of a stall. I guess the cockpit recorder may help there.
From what I read in the news reports about the aircraft hitting at extreme speed, it seems to me the airspeed indicators (all of them?) were Under reading rather than Over reading. So the aircraft did not stall but rather went into CFIT because the pilots think the aircraft was too slow so they kept pushing the nose down. As to why the Horizon Indicator was not consulted we will never know. Sensory cues like aircraft noise and possibly some vibration should have provided some clues that the aircraft was approaching Mach 1. We will never know.
The Stick Shaker should have at least given them a clue that they were a little too slow! I cannot see all 3 Pitot Static systems and the Stall Protection system failing.... I am not sure about the max, but a lot of them have auto slats at slow speeds... Being Avionics I had to perform these tests... When all of this happens all at once it is pretty radical... You cannot miss it unless you are unconscious, and then it would be questionable. I know no human way possible you can stall a 737 and not know it... There are even lights on the glare shield tell you that you are in or about to stall the aircraft....