QUOTE]I'm wonder if all 4 Olympus 593 all died in flight and unable to restart. Is it
possible to be able to land at the nearest airport[/QUOTE]
As CristiaanJ says , it depends on how far the nearest airfield was away, but given that there was one close enough then yes in theory it was possible.
On Concorde there were two checklist to cater for a four engine failure that assumes the engine have flamed out but not seized thus the system can be fed by windmilling engines. The two drills are
4 ENGINE FAILURE ABOVE MACH 1.2
4 ENGINE FAILURE BELOW MACH 1.2
When above M1.2 the windmilling speed of the engines should keep the engine generators on line and you should have good hyd pressure also.
Therefore the main point of the drill at this speed is to try and relight the engines, by selecting relight on all 4 engines at the same time. You normally got the chance to go through 2 and some times 3 relight sequences before the speed dropped to Mach 1.2
At mach 1.2 with no engines then the windmilling speed is reaching a point where it is not sufficent to hold the generators on line so the drill concentrates on switching as much of the systems onto essential electrics which will be supplied by the hydraulically driven emergency generator.
To help support the yellow and green hyd system below M1.2 the ram air turbine is lowered. Engine relights will continue to be attempted but as you are on essential electrics now they can only be attempted individually.
If no relights and below 10,000ft then the c/list tells you to prepare the aircraft for landing by lowering nose/visor and gear by emergency systems with speed reduced now to 270 kts. To conserve hyd pressure being mainly derived now from the RAT for the flying controls the emerg gen is switched off during the approach and approch speed is 250 kts with min landing speed
of 200kts
During this all this descent the aircraft had to be flown and navigated, radio calls made along with PA and cabin briefing and all the normall descent checklist complied with so you can imagine it was quite a busy time
This drill used to be practised on the sim ,but the crew would normally find the engines started to relight before 10,000ft so as to give the crew confidence that the drill worked.
However after many years of operation there was some talk about doing away eith the drill as no one could envisage it ever happening. then the BA 747 lost all 4 engines in the volcanic ash cloud and all such talk stopped