fr8mech From United States of America, joined Sep 2005, 5657 posts, RR: 15
Reply 2, posted (2 years 4 months 4 days 19 hours ago) and read 4235 times:
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.
PGNCS From United States of America, joined Apr 2007, 2858 posts, RR: 48
Reply 4, posted (2 years 4 months 3 days 23 hours ago) and read 3888 times:
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.
charliecossie From Germany, joined Oct 2001, 479 posts, RR: 9
Reply 6, posted (2 years 4 months 2 days 12 hours ago) and read 3615 times:
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.