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Vibration Felt Through The Engine

Posted: Wed Aug 22, 2012 2:09 am
by arzouni
hello,
please i need help with this research am doing for my uni... please

During a post flight de-brief, a pilot reports excessive vibration felt through the engine to the aircraft, the vibration increased in severity with increasing RPM.

Investigate the possible causes, list your checks to determine the possible cause, and give details of the procedures to carry out the relevant inspections.


i really would appreciate some help.  

RE: Vibration Felt Through The Engine

Posted: Wed Aug 22, 2012 3:49 am
by KELPkid
Let's start with what type of engine-piston or jet? It makes a big difference  

RE: Vibration Felt Through The Engine

Posted: Wed Aug 22, 2012 4:38 am
by fr8mech
On a jet engine:
-you can rule out an indication problem, because the vibration is felt and it follows the throttle
-external visual inspection of the engine. Inlet and exhaust, for damage and missing parts. Look for "bb's" in the exhaust.
-check any external bleeds for metal
-pull chip detectors
-open the cowl and do a quick look see of the engine components. Take a close look at the mounts and the torque stripe
-perform an internal inspection of the engine; borescope

If no damage found; run the engine at idle and note vibration indication. If normal advance throttle until vibration is evident and begin to isolate components IDG/CSD, Hyd pump and see if they are the cause.

Is this a fan or core vibration. If a fan vibration; perform a fan vibration survey and see if it can be balanced. If a core vibration, chances are you should have already discovered the problem. If not, contact your powerplant engineering department for guidance...and the serial number of the new engine you'll be installing.

RE: Vibration Felt Through The Engine

Posted: Wed Aug 22, 2012 7:16 pm
by MD11Engineer
While I agree with your troubleshooting strategy and would use the same approch, the question sounds suspiciously as if the OP is looking for somebody to do his homework assignment for him.

Jan

RE: Vibration Felt Through The Engine

Posted: Thu Aug 23, 2012 1:07 am
by PGNCS
Quoting MD11Engineer (Reply 3):
While I agree with your troubleshooting strategy and would use the same approch, the question sounds suspiciously as if the OP is looking for somebody to do his homework assignment for him.

  

My thought exactly. Although I don't mind sharing information, I don't do school assignments for other people.

RE: Vibration Felt Through The Engine

Posted: Thu Aug 23, 2012 4:31 am
by fr8mech
Quoting PGNCS (Reply 4):
My thought exactly. Although I don't mind sharing information, I don't do school assignments for other people

Which is why I didn't go nearly into the detail he was asking.

Quoting Arzouni (Thread starter):
Investigate the possible causes, list your checks to determine the possible cause, and give details of the procedures to carry out the relevant inspections.

RE: Vibration Felt Through The Engine

Posted: Fri Aug 24, 2012 12:03 pm
by charliecossie
Also would need much more information to perform meaningful troubleshooting.
Typical pilot to just say he had vibration.

Was it N1, N2, BB or even N3 vibration (on a proper engine)?
If it was N1, were there icing conditions and was the ice shedding procedure carried out?
If it was N2 on an engine which also has N3 then there could be serious implications.
Otherwise, workscope one and kick it back out.

RE: Vibration Felt Through The Engine

Posted: Fri Aug 24, 2012 9:45 pm
by HAWK21M
Quoting PGNCS (Reply 4):

My thought exactly. Although I don't mind sharing information, I don't do school assignments for other people.

Exactly what I was thinking.....
Depends on the type of Engine,it could be engine related or accessory mounted on the GB related.