For the aviation fans

[kosmonooit]

Yip that is exactly the picture I had.

 

Quite possibly the supersonic shock wave? Those things are weird and wonderful.

[Capricorn]

Quite possibly the supersonic shock wave? Those things are weird and wonderful.

nah. the pressure wave spreads out in a cone behind the aircraft's  leading edge that creates the compression.

 

Where that cone hits the water it will effectively be a line perpendicular to the point of travel.

 

like so...

 

 

To create that level of upwash requires a massive localized drop in pressure above the water's surface. Unfortunately, even the trailing vortices generated by all aircraft, don't drop air pressure to that degree.

That looks more like the spray created by a very high powered watercraft than an aircraft.

Edited October 8, 2019 by Capricorn

[Long Wheel Base]

Remember this fatal accident? Well it has meant a fair amount of extra work for us and it's is almost always OT late at night. I have racked up a few of these inspections in the last year or so. It is a messy 4 hour job but very important. We have rejected 2 blades since starting with this inspection but we have probably inspected well over 1000 blades already(and it was one of the first engines we did so we were still new to it and the ultrasonic inspection made a small jump and we freaked out. Turns out it needed to jump a lot more).

Pics from last nights job.

[MrJacques]

Glad there are still people who do their job properly when it comes to aircraft maintenance!

[SwissVan]

Remember this fatal accident? Well it has meant a fair amount of extra work for us and it's is almost always OT late at night. I have racked up a few of these inspections in the last year or so. It is a messy 4 hour job but very important. We have rejected 2 blades since starting with this inspection but we have probably inspected well over 1000 blades already(and it was one of the first engines we did so we were still new to it and the ultrasonic inspection made a small jump and we freaked out. Turns out it needed to jump a lot more).

Pics from last nights job.

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Why are they on a trailer attached to a bakkie?

 

How sensitive are those blades to being dropped?

[Long Wheel Base]

Why are they on a trailer attached to a bakkie?

 

How sensitive are those blades to being dropped?

We don't transport them on the trailer at all. That trailer was modified with the carpet on the back and a shelf on the front for the spacers to do this job. We drive up to the aircraft and park the trailer in front of the engine. Do the job and off we go. The trailer is under our(jet shop) cost centre so we can't leave it in the hanger when not in use.

As far as being dropped, I guess like anything if we careless we can drop one. 2 guys do an engine together. 1 guy stands in the intake and removes the blades and passes them to the guy on the floor. He(or these days even a she sometimes) then takes the blade and puts it on the trailer. Once all are out we clean the old molykote spray off the root and then do the ultrasonic inspection. Then we re spray molykote on the root and once dry pack them all back. They blades are all weighted and there are balance weights inside the spinner so it all has to go back in the same way it came out.

 

(Most of this info is not for you Swiss as I know you know how it works)

[SwissVan]

We don't transport them on the trailer at all. That trailer was modified with the carpet on the back and a shelf on the front for the spacers to do this job. We drive up to the aircraft and park the trailer in front of the engine. Do the job and off we go. The trailer is under our(jet shop) cost centre so we can't leave it in the hanger when not in use.

As far as being dropped, I guess like anything if we careless we can drop one. 2 guys do an engine together. 1 guy stands in the intake and removes the blades and passes them to the guy on the floor. He(or these days even a she sometimes) then takes the blade and puts it on the trailer. Once all are out we clean the old molykote spray off the root and then do the ultrasonic inspection. Then we re spray molykote on the root and once dry pack them all back. They blades are all weighted and there are balance weights inside the spinner so it all has to go back in the same way it came out.

 

(Most of this info is not for you Swiss as I know you know how it works)

I was wondering what the procedure is if you dropped one.... when I was still an appie I remember one of my journeymen dropped a CT wheel while working with it on a bench, big catastrophe and insurance claim worth about 100K and that was in the 80’s

[Long Wheel Base]

I was wondering what the procedure is if you dropped one.... when I was still an appie I remember one of my journeymen dropped a CT wheel while working with it on a bench, big catastrophe and insurance claim worth about 100K and that was in the 80’s

TBH I don't know of anyone that has dropped one. I don't have cert on the CFM(My certs are all on APUs) but if I were signing for the engine after an incident like that I would treat it like any other damage and follow MM inspection procedures. It would probably be a Visual Inspection for tip curl, dings or dents. If the impact was on the root, we are already conducting an ultrasonic so that would cover that part. As to discipline, I guess that depends if the blade is damaged. 

We had guys drop an engine before while doing a change. The whole crew got a warning letter and put on probation. The letter was kept on their files. If it had happened again then I would say it is most certainly dismiss able. Just checked on AMOS, 1 fan blade costs $256913.25

[Bateleur1]

TBH I don't know of anyone that has dropped one. I don't have cert on the CFM(My certs are all on APUs) but if I were signing for the engine after an incident like that I would treat it like any other damage and follow MM inspection procedures. It would probably be a Visual Inspection for tip curl, dings or dents. If the impact was on the root, we are already conducting an ultrasonic so that would cover that part. As to discipline, I guess that depends if the blade is damaged. 

We had guys drop an engine before while doing a change. The whole crew got a warning letter and put on probation. The letter was kept on their files. If it had happened again then I would say it is most certainly dismiss able. Just checked on AMOS, 1 fan blade costs $256913.25

 

And here we complain about VW parts prices    Phokkit

[DJR]

And here we complain about VW parts prices    Phokkit

Yes, agreed.  

[Lotus]

And here we complain about VW parts prices    Phokkit

Still cheaper than Campag.

[geomark]

Oops

 

Plane left entangled in ski lift cables in Italian Alps after crash

 

https://www.bbc.com/news/world-europe-49987780

[Long Wheel Base]

And here we complain about VW parts prices    Phokkit

The whole engine costs $66 642 612.50

These are the prices listed on our system so not sure if it is entirely accurate when actual payment gets made. But probably not far off.

[Long Wheel Base]

The whole engine costs $66 642 612.50

These are the prices listed on our system so not sure if it is entirely accurate when actual payment gets made. But probably not far off.

Tried my luck with the whole aircraft. It's not listed. I guess we can't order an aircraft from the store so that is probably why.

[patham]

The whole engine costs $66 642 612.50

These are the prices listed on our system so not sure if it is entirely accurate when actual payment gets made. But probably not far off.

 

That price seems a little high compared to the nominal list price of the plane its fitted on. But then again, it's all marketing.....

 

Buy 2 engines, get the entire plane for free. Or buy the plane and engines cheap, cheap up front, then pay through the nose for spares and service for the next 20 years.

 

Ps. I wonder what that last 50 c in the price buys you - that's a pretty specific number? Maybe a coke for the poor sucker who's delivered it from the stores to you ?  

[Long Wheel Base]

That price seems a little high compared to the nominal list price of the plane its fitted on. But then again, it's all marketing.....

 

Buy 2 engines, get the entire plane for free. Or buy the plane and engines cheap, cheap up front, then pay through the nose for spares and service for the next 20 years.

 

Ps. I wonder what that last 50 c in the price buys you - that's a pretty specific number? Maybe a coke for the poor sucker who's delivered it from the stores to you ?  

What's the list price for a B737-800NG? It does seem high but then again I have never shopped around for an engine so would actually have no idea the going rate. You should see the note it has for "customs price", It's almost double that.