|Quoting B747forever (Reply 20):|
With ELT shouldnt they have an idea of where the wreckage is? Unless it was a sudden and immediate in air disintegration, shouldnt the ELT work?
The ELT, if the aircraft was equipped with them, can fail to activate for several reasons. It is unusual but not extremely rare for a crashed aircraft ELT to not function.
1. Aircraft missing with no call for assistance
2. Confusion over the probable last reported contact position
3. Confusion over which ATC sector was responsible for the aircraft
4. Endless shock and amazement on A-Net that an aircraft can disappear and not be found quickly.
We do see from the lessons of AF447 that the missing aircraft notifications came more quickly. That authorities are mobilizing to search.
But as mentioned several times - the ocean is a very, very big place. Even with the "1000 fishermen" mentioned above - the vast majority of the ocean is not under observation of people.
|Quoting SEPilot (Reply 38):|
almost any crew when faced with an imminent crash is likely to send out a distress message.
Are we sure the aircraft was still in VHF range, or was using HF
. Even today, establishing an HF
communication can take time, and attention away from working a problem on an aircraft.
|Quoting SKAirbus (Reply 40):|
This may be a silly question, but if the aircraft was hijacked, could it be possible to turn off the transponder and to lose track of the aircraft? Thus allowing the aircraft to be diverted elsewhere undetected... or would it still be visible?
A transponder can be turned off. If the aircraft is in radar contact, and the ATC is looking for the aircraft - they can see a primary return most of the time.
An aircraft could be diverted off course, and as long as it doesn't enter any of several security zones in the region - it could 'sneak in' without being noticed by ATC. Though there are several areas in the region when military ATC is very vigilant about watching for non-transponder aircraft intrusions.
However as recently happened in the United States, a small GA
aircraft crossed the US border over the Great Lakes and flew undetected all the way to the middile of Tennessee without being detected. It even crashed on a commercial airport property, and due to very dense fog that night the wreckage was not noticed for several hours.