Hello planchetflaw, it is viewers like you(and your comment) that inspire me to continue putting these simple videos out there. My videos are quite simple and low budget, but carry concepts that I find to be interesting and sometimes helpful. That's not everyone's cup of tea, but that's ok. I'm more of a back-to-basics, classroom style kind of guy. Anyway, thank you very much for taking the time to write your nice comment. It is well received and really means a lot. PS: You have a cool screen name that a numismatist would like.

Hello P3DJumboJet, I agree! Every body should see my videos...😜! Nah, seriously now, I am glad you liked my video and thank you for taking the time to leave me a positive feedback. Take care.

@@planesimple8514 You are very welcome sir!

Jt9d beast

Thank you Alexander. I'm glad you liked it. Good luck with your ATPL

Yep. Many generations of students have put their hands on them.

Thank you very much Mahdi Hossein gholi nejad. I'm happy to hear you liked my video. Welcome to Plane Simple.

Thanks for taking the time to write in your positive feedback.

Muchas gracias Bernardo. I appreciate it.

Awesome spiffytown! I'm glad to hear that you found my simple video helpful. Thank you. I think that any day that you learn something new is a good day.

Thank you Christophe L.

Exactly.

Thank you F Grai737. That blade noise is not an issue on the GE Passport 20 engines. They made those blades out a solid disc so now they can't move independently. You can see it on one of my videos if you are interested.

Hello pilot dinos, I'm happy to hear that. Thank you for the feedback.

Thank you Vinu kp, I appreciate it.

Yes Sir! That's the aftermath of several generations of students parading through, purposely causing damage to the leading edge of the blades to then practice blending out the damage. This engine is retired and now serves as a teaching aid.

@@planesimple8514 That's great. Do they still do such repairs and "blending" on these newer engines with the composite blades with the titanium edge?

You're welcome

These are retired engines that are now a school's teaching aid and practice tool

It doesn't affect them at all

Thanks Yunior.

You see them on 747-200 and 747-100

Thank you man. I appreciate the encouragement.

Hello enock elia, which clearance are you referring to? If it's the clearance between the hub and the blade root, that's done on purpose to allow for movement of the blades during changes in engine speed, to minimize vibration, etc.

@@planesimple8514 i refer the clearence btn hub and blade, thanks i've understand.

It's no surprise. That is a retired engine that has been a teaching aid at the school for several generations of students, each taking their turn at blending out damages to the blades. The result is what you see.

Thank you César.

Very good "Me", you have sharp eyes. These engines are retired and not airworthy. They are only teaching aids for A&P students at Broward College in Hollywood, Florida. Those blades are removed, damaged, blended again and reinstalled every semester and there's been many generations of students that have gone through there. That's why those blades look like that. Thanks for watching and taking the time to leave s comment.

@@planesimple8514 I work MRO and that was one of the first things i noticed was the blends and i was like my goodness what is the limits for blending on those blades! Thing looks like some one took a bucket of bearings and threw em in the inlet! Hahahaha

Hello Alexander Varga, there's nothing like a set of students armed with chisels and hammers to damage a set of blades. But it's ok, they get files and sand paper afterwards to blend the damage away. Obviously those blades will never see flight again. Thanks for watching and for your comment.

@@planesimple8514 not every day you get an opportunity to tear up thousands of dollars of parts in the name of training 😅

My pleasure Billy Pilgrim.

Hello J. Wolfe, great question! No, the blades don't make that noise, or at least nowhere near as loud as at 12 o'clock. The reason is that at the bottom the blade hangs like a pendulum and is free to slowly swing and change positions from one side to the other without a sudden stop. At the top, gravity holds the blade tilted back until the blade's center of mass goes past 12 o'clock, it is only then that the blade moves and quickly swings from one side to the other and produces the noise. I hope this makes sense. Thanks for that question.

They are indeed damaged, they ALL are! This is a non airworthy, partially dismantled and retired engine that is used as a teaching aid in school. All the blades have seen many generations be of students learning to blend dents on the blades and by now are all out of limits. You have a sharp eye though. Thanks for watching and commenting.

Correct! Well done Nixon Z3 ses.

Ding ding! You claimed the tittle! Lol...

Correct! Good eye!

B 747-100 have Jt9d

Boeing 747-100 and 200 have jt9d engines but 747-200 also has rolls royes engines

I love jt9d

That engine was a BIG step into the modern, high bypass engines.