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Originally Posted by RENURPP
(Post 9710525)
I can't recall an event like this in the last 20 years either, I can recall one about 24 years ago. A baron inbound to Darwin about 20 DME from memory, lost its propellor (assembly)
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To see how a complete propeller assembly will depart an engine/aircraft while still rotating maybe buy one of these and see for yourself.
Child Kids Spin Space Toy Plastic Flying Saucer Saucers Shooter Gun Set Gift | eBay |
A little bit over 20 years ago but on Feb 1 1993 a Nord Mohawk 298 VH-HKS lost a prop somewhere over the national park area just north of Sydney whilst en-route to Tamworth. Don't think it was ever found.
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Well done to all involved.
They were extremely lucky the airframe was not hit and severely damaged when it came off as is often the case in these type of incidents. For eg, There was this accident back in 1995, sadly a crash and people killed. A blade separated from the hub first, then the whole prop came off and lodged in the now drooping engine nacelle and wing LE. Was on Air Crash Investigations show. There have been a few of these type of events in transport category turboprops but thankfully they are rare. https://en.wikipedia.org/wiki/Atlant...nes_Flight_529 |
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ASA Flight 529 came to mind for me as well. The captain performed his duties to the fullest extent possible and saved lives. |
The loss of a propeller blade as opposed to a propeller are two different incidents with two different consequences.
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Where the f**k is the propeller?:confused:
If it occurred between Camden and Sydney, can't believe it hasn't been found by someone. |
Pretty good chance it's come down somewhere around R555 (Holsworthy)
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Originally Posted by Dale Hardale
(Post 9711385)
Where the f**k is the propeller?:confused:
If it occurred between Camden and Sydney, can't believe it hasn't been found by someone. It may be lost forever. Buried in the grass on someone's front lawn. Along with the 1978 Kingswood. |
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excellent:\
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Originally Posted by TTY
(Post 9711245)
A little bit over 20 years ago but on Feb 1 1993 a Nord Mohawk 298 VH-HKS lost a prop somewhere over the national park area just north of Sydney whilst en-route to Tamworth. Don't think it was ever found.
1964 Ansett ANA DC6B VH INA lost prop from RH inner due fatigue fracture after take off Essendon then engine itself fell off. Landed safe 1940 ANA C2 VH USY right hand engine fell off after engine fire. Landed safe NHill. |
Not just two. Bell Brothers' Cessna 411 (VH-BBV) near Meekatharra WA around 1968. Prop sheared off, and then came back and punctured the fuselage in several places. It missed the pilot's head by a few inches. DCA (as they then were) subsequently mounted a huge, and unsuccessful, search for the prop. I thought Griffo would have mentioned this one.
I'm with everyone else - I think the Rex crew did a great job here. |
Coincidentally, I saw an episode of Air Crash Investigations recently covering Reeve Aleutian Airways Flight 8 in 1983.
Lockheed Electra lost a prop. "The propeller tore a gash 8 feet (2.4 m) long in the aircraft's belly, causing the cabin to depressurize and jamming the flight controls and engine throttle controls." https://en.wikipedia.org/wiki/Reeve_...rways_Flight_8 All were very lucky to survive. Good episode. |
REX has grounded 5 other aircraft with the same gear box series
Regional airline Rex has grounded an additional five planes as an investigation continues into how a propeller fell off one of its aircraft as it was approaching Sydney Airport late last week. Regional Express says the crew had shut down the right-hand engine of the Saab 340 before the propeller assembly "was seen by the first officer to separate from its shaft" on Friday when the flight from Albury was 25 kilometres southwest of Sydney. "Rex has decided, by abundance of caution, to immediately remove from service and quarantine all propeller gear boxes and shafts of the same series as that of the incident for further inspection and testing if warranted," Rex said in a statement on Monday. A spokeswoman told AAP five aircraft were grounded in addition to the plane involved in Friday's incident, which has been quarantined. Two normally operate on Rex's Melbourne network, one is from Sydney and the remaining two are Pel-Air freighters. "There will be some minor disruptions for one or two days," the spokeswoman said. The Saab 340's engine was shut down on Friday following "abnormal indications", with the pilot "feathering" the propeller to reduce drag. The statement indicating the prop was being feathered indicates it was already shut down at the time of the separation which seems strange to me, what forces could rip a prop of if it wasn't under thrust? |
Via logansi: The statement indicating the prop was being feathered indicates it was already shut down at the time of the separation which seems strange to me, what forces could rip a prop of if it wasn't under thrust? As the prop were slowing down it would have been affected by all the other airframe/engine/gearbox/prop vibrations and may have hit a 'sweet spot' of harmonics that created enough vibration to finnish the job off. E.g., many aircraft prop/engine combinations have an engine 'rev range' where they should not be operated for any length of time due to vibration considerations. . |
I'd suggest the engine vibration abnormality leading to the crew shutting it down, was due to the propellor assembly becoming unbalanced as the shaft started to fracture on a serious scale - and as the engine was being shut down and the prop being feathered, the fracture finally extended to the full circumference of the shaft, and the propellor assembly then fell off.
http://oi63.tinypic.com/29cxwkg.jpg |
Does anyone know the maintenance/inspection scheduled for the prop shaft?
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The schedule is today and before further flight.
I hear they are extending this shaft in the next mod status so better NDTs can be conducted between overhauls. Also 3 extra grease nipples will be fitted for better (some) maintenance of the prop shaft other than visual inspection of the area you can not see when prop is fitted. |
So how's the Engine itself?
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