Sponsor Message:
Civil Aviation Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Smoke Out Of 747 Classic Engines?  
User currently offlineMedinaj From United States of America, joined Jun 2000, 39 posts, RR: 0
Posted (11 years 7 months 2 weeks 5 days 15 hours ago) and read 4633 times:

I recently flew MAD-MIA on one of IB's classic 747. A few hours into the flight, I noticed a stream of blue-ish smoke coming out of a little vent on the side of the outboard engine. I started freaking out a bit and shut my sunvisor closed. A few minutes later, I checked again and the smoke had dissappeared. Some minutes later I looked again and it was coming out again.

We landed at MIA without incident, and at no point did the FAs or pilot advise or do anything out of the ordinary, so I assume this was a normal event. Anybody has any idea of what this was? Sorry if it's a dumb question, I just never noticed this before.

4 replies: All unread, jump to last
User currently offlineJeffDCA From , joined Dec 1969, posts, RR:
Reply 1, posted (11 years 7 months 2 weeks 5 days 10 hours ago) and read 4471 times:

I've often seen this when the aircraft are taxiing around at SFB, only seems to happen on RR's though. Seen it on the B742's RB211's, and the A330's Trent 500's, coming out a small vent under the RR badge. Doesn't seem to happen on the 767's CF6's though.



User currently offlineFLYtoEGCC From United Kingdom, joined Feb 2004, 947 posts, RR: 2
Reply 2, posted (11 years 7 months 2 weeks 4 days 20 hours ago) and read 4178 times:

I noticed exactly the same thing on an Monarch A330 this year. I have no idea what it was, but the engine was an RR Trent 772. It's a little sort of pointy vent facing backwards, and white smoke came out. I was a little bit worried, but as you say, after take-off it disappears.

Come fly with me, let's fly, let's fly away...
User currently offlineJeffDCA From , joined Dec 1969, posts, RR:
Reply 3, posted (11 years 7 months 2 weeks 4 days 19 hours ago) and read 4159 times:

Just realised the mistake in my last post! Honestly, saying that A330's have Trent 500's... you'd never guess my home town is Derby!!  Wow!



User currently offlineBroke From United States of America, joined Apr 2002, 1325 posts, RR: 3
Reply 4, posted (11 years 7 months 2 weeks 4 days 19 hours ago) and read 4095 times:

What you were probably seeing are engine breather vapors. The seals in the engine's oil system at the bearings will generally keep out most of the high pressure air out of the system. But there is a little leakage past the seals. If you didn't have a way to relieve this increase of air pressure in the oil system you could over pressurize the oil system and start losing oil through these same seals and in other areas.
So you vent the oil system breather air overboard. The system has a unit that centrifuges most of the oil out of the air before it goes overboard, but a little will go out with the air. So you sometimes get a little bluish vapor coming out of the breather vent port.
If your oil temperature, oil quantity, and oil pressure are normal; then there is nothing to be worried about with these vapors.

Top Of Page
Forum Index

This topic is archived and can not be replied to any more.

Printer friendly format

Similar topics:More similar topics...
Californian Woman To Build House Out Of 747 posted Thu Apr 20 2006 16:26:57 by Cloudyapple
Boeing Employees Steal A Life Raft Out Of A 747. posted Thu Feb 10 2005 16:38:42 by Juventus
Atlas/Polar To Phase Out 747 Classic posted Thu May 25 2006 15:42:00 by Viasa
Boeing Buy-out Of GE Engines? posted Tue Aug 3 2004 20:20:42 by ConcordeBoy
UA 747 Engine Out Of SFO 6-28-1998 posted Tue Jul 20 2004 22:07:23 by 1011
1,300th 747 Rolls Out Of Factory posted Tue Feb 19 2002 23:12:20 by Cruising
TWA And PAN Am 747 Routes Out Of JFK posted Thu Oct 11 2001 19:02:00 by VirginA340
BA To Operate 747-4s Out Of Detroit posted Sun Feb 11 2001 17:23:25 by Zsx81
Kitty Hawk Pulls 3 747's Out Of Service. posted Sat Feb 26 2000 14:56:55 by Sqman
What Is HKG Tarmac Made Out Of? posted Tue Nov 21 2006 04:10:54 by Kaitak744