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According to experts, Mumbai, July 12 (PTI) Air India aircraft, which crashed in Ahmedabad soon after the takeoff last month, may change the position of the switch -feeding switch to the fuel in the aircraft.
He also said that the reasons for the change in the condition of the fuel switch would be known during further investigation.
Aircraft Accident Investigation Bureau of Investigation (AAIB) preliminary report mentions that fuel switches of engines 1 and 2 of Boeing 787-8 aircraft were cut within a second interval and later turned on before the accident on 12 June.
Federation of Indian Pilot (FPI) president and former Air India Pilot Captain CS Randhawa said that the position of the fuel switch could be replaced with only one human interface.
These switches are spring-loaded and have a lock. If they are put in the run position, first, it has to be taken out and going to the position, he said.
According to him, the switch is usually used if there is a flame of both engines or pilots have recycled the switch. He said, “It is not clear from the initial report why the switch situation had changed”, he said and said that the power supply could also be interrupted.
“When the fuel control switch is to be cut, the pilot will say flying, the fuel control switch is left, confirm. Therefore, after the second pilot is confirmed, the pilot will be cut (switch).
He said, “In this case, the first officer was landing the aircraft and Captain Pilot was monitoring. Now, was this control between the captain and the first officer? It is not clear from the report,” he said.
Fuel switches are under throttles.
“Now, in the case of a dual engine flame, the auto-throotle switch is closed and the fuel control switch is made to cut and run. Originally, they re-activate,” he said.
A former Directorate General of Civil Aviation (DGCA) said that the condition of the fuel switch changed and the question is why this happened.
“Now, the investigation will take in the direction as to why this switch situation has changed, whether it is a mechanical failure, whether it was intentionally or unknowingly or something else or if there was a problem … the question is whether there was a software mess or not or not,” he said.
In the report, there is no mention of whether there was any fault of fuel switch before.
A senior Boeing Commander said that it is not clear from the preliminary report as to why the fuel switch was converted from a run position to cutoff. This change must have happened inadvertently, he said.
According to a senior official, who has been part of the investigation of various aircraft accidents, the investigation in the coming months will help find out the reasons, including any mechanical issues to change the condition of the fuel switch.
“The aircraft achieved a maximum recorded aircraft of 180 not IAS at around 08:08:42 UTC and soon after, the engine 1 and the engine 2 fuel cutoff switch was infected with an interval of 01 seconds after another in the event of a cutoff by run.
“Engine N1 and N2 began to reduce their take-off values as the fuel supply to the engine was cut off.
The report states, “In cockpit voice recording, one of the pilots is heard asking the other why he cut off. The other pilot replied that he did not do so.”
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