SAS 751: Variable to the design

[Kreyren]

It was reported that Scandinavian Airlines Flight 751 (SAS751) crash landed due to the buildup of ice on the wings that was sucked into the engines that then became inoperative after the take off resulting in a fatal failure of the DC-9 even though the piloting skills of the crew resulted in a no fatalities (HOW? I HAVE NO IDEA WHAT A LEGEND!)

The ice on the wings was sucked by the engines that caused the emergency

On most aircrafts these days the ice would woudn't be sucked into the engine due to their placement:

But on DC-9 the engines are on the tail section which makes it susceptible for the ice to be sucked inside them

Credit for the images: Mayday show series 10 Episode 8 named Scandinavian Airlines Flight 751

Automatic Thrust Restoration (ATR) caused the self-destruction of the engines and the fatal failure of the aircraft

Due to the engine surge caused by the ice the pilots were supposed to lower the power to the stalling engines which they did, but the Automatic Thrust Restoration (automated system put on SAS's DC-9 by the manufacturer) forced the engines to 102% power after that which made the engines to self-destruct mid-flight.

This "feature" was allegedly sneaked in on the aircraft by the manufacturer and pilots weren't trained for it. It was concluded that if pilots were informed and trained for this it could avoid the fatal failure.

Crew never gave up

Crew never gave up until the aircraft was on the ground this has proven to be common practice in aviation to lower the risk of fatal failure.

SAS's procedure for checking a clear ice were insufficient

Investigation concluded that there was a layer of clear ice on the wings even when the aircraft was de-iced twice before takeoff.

Clear ice on the wings is dangerous for the aircraft and has to be adapted in the design