Go Back  PPRuNe Forums > Flight Deck Forums > Tech Log
Reload this Page >

Negative oil pressure

Tech Log The very best in practical technical discussion on the web

Negative oil pressure

Old 5th Jun 2016, 11:59
  #1 (permalink)  
Thread Starter
 
Join Date: Apr 2008
Location: nowhere
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Negative oil pressure

Saw it for the first time ever yesterday. On a GE90 right at initial engine start. Only went to -1 psi but was a little surprised that the manufacturer would even take the time to provide such a measurement.
JammedStab is offline  
Old 5th Jun 2016, 13:48
  #2 (permalink)  
 
Join Date: Aug 2009
Location: GPS L INVALID
Posts: 578
Likes: 0
Received 0 Likes on 0 Posts
Yup, quite common on the GE90s. Oil pressure as indicated on the EICAS is a differential measurement between the oil pressure after the oil/oil heat exchanger and the air pressure in the bearing sump, never seen anything lower than -1psi, so I would still reckon thats actually 0 delta p within the accuracy of the piezo pressure transducer elements.
STBYRUD is online now  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.