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Propellor falls off Rex Saab 340 in NSW Australia

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Propellor falls off Rex Saab 340 in NSW Australia

Old 17th Mar 2017, 05:56
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Propellor falls off Rex Saab 340 in NSW Australia

Just to hand

Rex aircraft propeller fell off mid flight: Plane forced to land at Sydney airport
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Old 17th Mar 2017, 07:06
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I do hope this is not fake news. Nobody seems to have replied and it happened some hours ago.
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Old 17th Mar 2017, 07:11
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Thread running here

http://www.pprune.org/australia-new-...dent-yssy.html
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Old 17th Mar 2017, 07:14
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No worries, thanks. It's not everyday an aircraft lands sans half a brassiere.
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Old 17th Mar 2017, 07:21
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Originally Posted by garpal gumnut View Post
I do hope this is not fake news. Nobody seems to have replied and it happened some hours ago.
Did you try clicking on the link in the first post ?



Nobody is that good with Photoshop.
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Old 17th Mar 2017, 09:02
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It is good to see that major Australian Aviation incidents can be kept on an Australian only forum.

We've been doing it our own way with good results since WW2, so why involve others.
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Old 17th Mar 2017, 09:41
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Given the dynamics, 'Saab fall off prop' shurely?
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Old 17th Mar 2017, 09:55
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I'm probably going to get in to strife with the moderators, but many Australians, Canadians and people in Asia and South America are concerned about this incident on a Saab 340. It is not just an Australian issue.

More people travel domestically than intercontinental.

A propeller shearing off a domestic flight should be discussed as minutely as a failure of an intercontinental Airbus incident.

This incident is buried in PPRuNe.org
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Old 17th Mar 2017, 10:46
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Three pans in play over ten minutes.

http://archive-server.liveatc.net/ys...2017-0030Z.mp3

Initial report from 968, casual as you like, starts around 9:40 mark
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Old 17th Mar 2017, 14:38
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amazingly clean break away, unlike a prop blade failure.
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Old 17th Mar 2017, 16:21
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Appears to be either a prop shaft break (prop gearbox output shaft), or even failed big retaining nut on the aft side of the "bull" gear internal to the gearbox. There was another lost prop incident in the mid-80s over Lake Erie, US carrier Comair IIRC.
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Old 18th Mar 2017, 11:14
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Not first event

Previous issue with CT7 gearbox output shaft caused at least 1 starboard propeller departure in flight. Our red on an American Eagle operated Saab 340 in 1991, unlikely to be the identical issue how er?
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Old 18th Mar 2017, 11:19
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Correction

Apologies operated by Comair departed propeller landed in Lake Erie and disappeared. Fleet inspection was in place at that time.
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Old 20th Mar 2017, 05:11
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At least the plane was in a low drag condition for the OEI engine.
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Old 20th Mar 2017, 14:04
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More info today

Sydney airline grounds 5 planes after propeller drops off | Miami Herald

I read in one article that the pilot was already taking action on the engine when he saw the prop depart up and over the wing away from the fuselage.

That observation would match a clean release of the prop while still under power.

With a left hand engine it might have been different
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Old 20th Mar 2017, 15:12
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From an engineer's point of view this is one of the most disturbing aviation news this year. Here we have a commercial airline in an industrial country, operating a quite common type, following (I suppose) well-audited rules, all the paperwork (supposedly) in order, and we have a major structural failure which had a 50% chance of really messing up the aircraft. Any human error, any aggravating circumstances must have occurred on ground, where they were supposed to be identified and corrected by the supposedly well-audited quality control system. It's just a combination of luck and crew skill the passengers and crew needed no more than counseling (if they even really needed that).


So where's the original problem and what can we learn from the incident?
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Old 20th Mar 2017, 16:35
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So where's the original problem and what can we learn from the incident
The report will tell. Should not be too difficult to determine forensically. Fatigue initiated by corrosion pit, tooling mark, could be anything.

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Old 21st Mar 2017, 05:27
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Propeller found

http://www.pprune.org/australia-new-...ml#post9713380
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Old 21st Mar 2017, 10:28
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swarf =chip detector light/ tooth = sun/planetary disrupt

Always best to get a chip-detector light first from the swarf of a lube fail or misalignment. Not good when the sun/planetary enmesh leads to a tooth detaching. That leads to the prop-torque inducing a prop separation. But always good when it detaches cleanly (up, up and away) and doesn't penetrate the fuselage.....
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Old 21st Mar 2017, 13:10
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The report will tell. Should not be too difficult to determine forensically. Fatigue initiated by corrosion pit, tooling mark, could be anything.
A common cause of fracture failure in a high-quality steel component is a fault in the heat-treatment process, that has led to a finished product that is outside the manufacturers specifications, and which has left the item excessively hardened, or not toughened enough.
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