Fokker 50s engines in reverse mode before crash!!!!!!

Rverese on the outer engines propably torns them off :D.
Doesn’t the reverse on the trident would make a lot of noise?

Yes, as was the Trident.

I can’t imagine there being any turboprops that are certified for the use of reverse pitch inflight but if you read the posts above you will see that it is possible to override the devices that are designed to prevent the crew from doing so. The strange question to be answered is why do flightcrew feel the need so often to manually override these devices. I never felt the urge to kill myself by such means when I flew them!

How is it possible that the reverse pitch was activated? Isn’t there a computer that makes this impossible? Are there airacraft where reversing in full flight is a normal procedure? Like emergency descent on turboprop or so?

Originally posted by Bmused55
in all fairness, it could happen to any type 🙂

Of course it COULD.. 🙂 but Fokker acknowledged that problem a long time ago, and it’s strange that not all aircraft have been fixed.. the same thing happened with a fokker in Peru, years ago…

So it’s rather fokker-related..

Thanks for the info Darren. I didn’t realise the automatic idle stop wasn’t an original installation. In that case the Swiss must have insisted that the manually applied stop remained in place despite the automatic stop being in place as their Saabs always had both whereas the Saabs Aurigny inherited from you and the ones we borrowed from Skyways and Regional Airlines all had the manual stop removed.

Interesting that 2 similar crashes have occurred in relatively close proximity.

Forget about comparing turboprop reverse pitch incidents with turbofan/jet reverse thrust incidents as the machinery is totally different.

With regard to turboprops I can only refer to the Saab 340 as I never flew any other turboprop. The Saab has a thing called a ‘beta stop’ which was a device that prevented the propellers entering the Beta range and subsequently entering thereverse pitch angles. This beta stop should automatically disengage when the aircraft touched down to allow reverse pitch to be selected. There was a ‘beta stop override’ that could be pulled to allow selection of reverse in case the beta stop did not automatically disengage. I remember when I trained with Crossair that all their aircraft were fitted with an additional mechanical catch that their pilots would engage after take off to manually prevent the power levers being moved beneath the flight idle stops in flight. This catch would then be disengaged during the landing checklist. This mod was only ever enforced by the Swiss. I believe there had been a Saab 340 crash (far east?) where the crew over rode the beta stop in flight and lost all their propeller blades!

Originally posted by DarrenBe
Mark,

You’re not thinking about the Luxair F50 crash,where it has been determined that the props were in beta mode, just prior to the crash?

Darren

Thats the one! I knew I had read something similar beforehand!

Originally posted by andrewm
Bemused your Dash 8 Q400 might do it!

Oh behave!

Bemused your Dash 8 Q400 might do it!

No I am thinking of a prop. Still can’t put my finger on it. Aaargh!

Originally posted by rekkof2004
Happend with a FOKKER F100 [yes a FOKKER again] from TAM,
One of the engines went into reverse mode causing the aircraft to crash.

rekkof2004

in all fairness, it could happen to any type 🙂

Happend with a FOKKER F100 [yes a FOKKER again] from TAM,
One of the engines went into reverse mode causing the aircraft to crash.

rekkof2004

Yeah.

I read the CVR transcipt of that Lauda air incident

Shortly after takeoff, a REV ISLN message appeared on the aircraft’s EICAS system alerting the crew that there was a malfunction with the thrust reverser isolation valves. (For the uninformed, thats the top screen in the center of the main panel)

Thinking it was probably moisture in the system the crew opted to continue the flight but consulted the aircrafts manual, it stated no actiuon required for this particular type of messeage while inflight.
However, as the aircraft approached FL310, the no.1 engine thrust reverser engaged. The incredible force on the aircraft caused the airframe to break apart within several seconds.

Poor soles

It happened to a Lauda 767 over Thailand on Sunday the 26th of May 1991 while climbing through 5000ft, with the loss of all 213 passengers and 10 crew

Theres some nagging feeling in the back of my mind that this has happened before, a prop engaging reverse pitch at the wrong moment.
Can’t think of the incident though :confused:

wow what a terrible glitch…reverse mode in mid air, i wonder what caused it.