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skidmk
Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario
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 Posted: Mon Sep 10, 2018 8:00 am Post subject: weird bumping (thumping noise) sound from the Jet??? Help |
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Folks,
anyone experience this issue?
Low time engine <50 hours. Iron content is up on last oil analysis.
about 10 hours ago, she started giving us an asymmetric bumping sound most prevalent at high power settings, less so at low and idle.
all other parameters are fine, good rpm, temps and pressure all good. NO changes during the bumping
mechanic, removed and ultrasonically cleaned the injectors. Bumping went away for about 2 hours. Yesterday. Bumping is back, and for first time, when i pulled the fuel control to zero for shutdown, there were bumping (thumping?) that were audible . During the cleaning of the injectors, tail was off, and we run it up with zero bumping and nothing visible out of the ordinary.
thoughts??
thanks in advance
Mike "skidmk" Bourget
AcmWarbirds
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Mike "Skidmk" Bourget
Ottawa, Ontario |
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Alekh
Joined: 17 Aug 2013
Posts: 31
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| Posted: Tue Sep 11, 2018 9:23 am Post subject: Re: weird bumping (thumping noise) sound from the Jet??? He |
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Is turbine stop time no change/variance from when it was normal?
Andy
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skidmk
Joined: 19 Nov 2007
Posts: 171
Location: Ottawa, Ontario
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| Posted: Wed Sep 12, 2018 10:03 am Post subject: Re: weird bumping (thumping noise) sound from the Jet??? He |
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no change or variation in any engine parameters.
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Mike "Skidmk" Bourget
Ottawa, Ontario |
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