Jeju Air Flight 2216 Crashes in South Korea

[RSD]

Australia is a minnow, so if it came out with something that wasn’t already required elsewhere, we simply wouldn’t be getting new aircraft.

But, you’re missing the point. It simply doesn’t matter if the recorders are powered, if the data sources aren’t powered. So, you need to provide backup power to the recorder, and then to the data bus, and then to the network hubs, and so on until you reach the item you’re interested in. And it isn’t outputting anything, ‘cos it’s dead. It may work with CVRs, where you’re only trying to power the recorder, data bus, and microphones, but it’s not a small thing.

My guess though, would be that only aircraft that have been certified after 2010 might have backup. And that sounds like the 220, and probably the 350, but nothing else. Even then, I’m only expecting CVR, as the other is just too hard for the minuscule benefit.

So would it be fair to sum up what we "know" as -

- for some reason the power was lost to both the CVR and data recorder about 5 minutes before the emergency landing, but that couldn't have been caused by both engines shutting down or being shut down because after the recorders lost power the pilots elected to go around and still regained altitude and then completed the turn and landed? I guess the other interesting thing is that from all information we have - the recorders both stopped some seconds before the pilots decided to go around - and obviously the pilots had sufficient confidence in the engine(s) at the decision point or they wouldn't have gone around.

 

[RSD]

I doubt that he had any reason to expect the overrun contained a solid obstacle and may well have figured that ending in the overrun wasn’t going to be too bad an outcome.

Possibly may not have considered/expected the huge float that occurred for quite some distance down the runway either - if that hadn't of occurred then the solid object in the overrun may not have even come into play.

 

[Quickstatus]

5 minutes before the emergency landing

Apparently 4min before impact
But I'd like to see the actual timeline
Last recorded words in the CVR was "Mayday".

couldn't have been caused by both engines shutting down

The ADSB, CVR and FDR all powered from the AC electrical bus - ie powered by the engine generators.

and still regained altitude

Where is the data for that? Last recorded altitude on ADS-B was 900 feet. An unpowered aircraft can gain altitude at the cost of airspeed - you don't necessarily need engine power to go higher. What was the highest altitude in the GA.?

They did have some control - as they were able to GA and land from the opposite direction- hydraulic pressure does not suddenly drop to zero when engine thrust goes to zero - as stated above there is a nominal amount of hydraulic pressure generated from a windmilling but otherwise dead engine depending on airspeed.

Does a windmilling engine also produce some electrical power above a certain IAS?

obviously the pilots had sufficient confidence in the engine(s) at the decision point

Speculative. I don't think we can read their mind to know what they were thinking nor hear what they said in the 4min

 

[RSD]

Where is the data for that? Last recorded altitude on ADS-B was 900 feet. An unpowered aircraft can gain altitude at the cost of airspeed - you don't necessarily need engine power to go higher. What was the highest altitude in the GA.?

Was basing the gaining of altitude from knowing that they were down to 900 feet and then @jb747 's earlier comment that they would have needed 2000 feet of altitude to make the turn if they didn't have power.

 

[Quickstatus]

Was basing the gaining of altitude

Unfortunately there is no actual data on that. The crash investigators should be able to recreate the flight path profile based on available video and ATC radar (will there be a record?), known aircraft dynamics and aircraft mass using a simulator. Basically an exercise in kinetic and potential energy