Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
747 Engine Inlet Sparks  
User currently offlinedl757md From United States of America, joined May 2004, 1564 posts, RR: 15
Posted (5 years 5 months 1 day 10 hours ago) and read 3851 times:

Regarding the following picture

View Large View Medium
Click here for bigger photo!

Photo © Thomas Merkl

I work around engines all the time at night and I'm quite familiar with the phenomenon of static electricity discharging from the fan blades which is more common in the winter due to the lower relative humidity. This picture is the first one I've seen on Anet of the phenomenon (I'm sure there are others) and it struck me as unusual because when I've seen static discharge it's not usually localized at the blade tips as on engines 1,2 and 4 on this Qantas bird. It's usually more dispersed across the disc.
It's possible it could be the tips rubbing the abradable shroud but then why only from the 5 o'clock to 7 o'clock positions? Why is it not doing it on nbr 2 engine? Anyone care to float a theory?


757 Most beautiful airliner in the sky!
4 replies: All unread, jump to last
User currently offlinefutureualpilot From United States of America, joined May 2000, 2642 posts, RR: 7
Reply 1, posted (5 years 5 months 1 day 10 hours ago) and read 3842 times:

Given the angle at which it appears the sun is illuminating the rest of the airplane I'm thinking its just the way the sunlight is hitting the fan, not actual discharges of electricity.

Life is better when you surf.
User currently offlinedl757md From United States of America, joined May 2004, 1564 posts, RR: 15
Reply 2, posted (5 years 5 months 1 day 10 hours ago) and read 3836 times:

That would explain why number three has no "sparks" being that it's in the shadow of the fuselage. Thanks!

757 Most beautiful airliner in the sky!
User currently offlineEMBQA From United States of America, joined Oct 2003, 9451 posts, RR: 10
Reply 3, posted (5 years 5 months 1 day 7 hours ago) and read 3759 times:

The snow causes it ..............

"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineboeingfixer From Canada, joined Jul 2005, 578 posts, RR: 0
Reply 4, posted (5 years 5 months 1 day 5 hours ago) and read 3699 times:

Quoting EMBQA (Reply 3):
The snow causes it ..............

Not in this case. Everything in shadow is dark indicating that this is just reflected sunlight.

Although snow can cause static electricity discharges on fans it is not as drastic as one would think. During daylight this phenomenon is all but unnoticeable.



Cheers, John YYC
Top Of Page
Forum Index

Reply To This Topic 747 Engine Inlet Sparks
No username? Sign up now!

Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)

Similar topics:More similar topics...
Y1, 787, 777NG, 747-8 Engine Speed Increase posted Fri Aug 3 2007 15:29:57 by AA7295
Engine Inlet Plugs - Type posted Tue Feb 13 2007 17:03:56 by HAWK21M
RB211-535 Engine Inlet Guard posted Sat May 6 2006 10:47:52 by HAWK21M
747 Engine Running For "4" Days? posted Mon Sep 13 2004 18:14:05 by Mr Spaceman
Explosive Bolts On 747 Engine Pylon posted Sat Dec 6 2003 21:51:44 by GrandTheftAero
Object In 737 & 747 Engine's Tailpipe - Question posted Thu Jun 5 2003 22:36:54 by Mr Spaceman
737-400 Engine Inlet Deice MEL posted Thu May 17 2001 20:38:15 by Doomfox
AZ 747-100 Pic; Engine Failure? posted Sun Oct 3 2010 22:43:44 by United960
747-8: Why The Engine Nacelle Strakes (aka Fins)? posted Sat Feb 13 2010 06:49:36 by western727
Engine Start With The 747/200 posted Sat Jan 9 2010 14:46:50 by Oli

Sponsor Message:
Printer friendly format