Another Most Asked Question! 737 Line

Stealthz · Tue May 03, 2005 1:10 pm

Hi all,
This may have been asked many times but I tried a search and came up empty... might be the way I asked.

Anyway.. what is this red line that goes about a third of the way around the lower fuselage on many 737s, just aft of the L1 door. I see it on most(but not all)aussie 737s and many overseas ones.

View Large View Medium
Click here for bigger photo!

Photo © Nicholas A Vollaro

Thanks in advance

Chris

AvionicMech · Tue May 03, 2005 6:49 pm

Hi Chris,

This red line you are talking about is on all 737's as far as I know and it shows roughly the danger area if the engines are running. You will also find a red danger line on the fan cowl of the engine, so basically if you between the red line on the fuselage and the one on the engine you are at risk of being sucked in, if the engines are running. You can see the area I mean quite well in this picture:

View Large View Medium
Click here for bigger photo!

Photo © Keith Burton

The line on the engine is fairly self explanatory if you look at this picture:

View Large View Medium
Click here for bigger photo!

Photo © Jordi Cuadrado Borbonés

Avionic Mech

lekohawk · Tue May 03, 2005 6:53 pm

How is it that if I stand that far back, and right next to the engine that I am in any danger of being pulled through? Is there really that much air moving?

Stealthz · Tue May 03, 2005 7:09 pm

OK, I can go with that but why is there not a similar line on other jets?
Is it because the 737 is a "reasonably" large jet but is more often at smaller more "manual" type airports, not the right description but airports that are likely to have more "less trained" people around.

Is certainly not on all 737

View Large View Medium
Click here for bigger photo!

Photo © Chris Griffiths

or can be hard to see on some..

View Large View Medium
Click here for bigger photo!

Photo © Chris Griffiths

Thanks for the info

Chris

AvionicMech · Tue May 03, 2005 7:38 pm

I don't know why they only put them on the 737's but it could well be because they fly into some more of the smaller airports. It could also be because the -100/200 series were fairly short aircraft and during push-back the person on the headset could get fairly close to the engines and risk being sucked in. There is probably very little need for it on the aircraft now but Boeing does not like to change things very much on the 737 series for some reason.

I think you would be very surprised Lekohawk as to quite how much air is consumed by a jet engine even at idle power. You can see in this picture that Boeing obviously thinks it is a danger otherwise they wouldn't put this decal here:

View Large View Medium
Click here for bigger photo!

Photo © Kevin Van Bunnen - Brussels Aviation Photography

HAWK21M · Tue May 03, 2005 8:02 pm

The Vertical line cautions the limit beyond is the Danger zone with Engine running.
regds
MEL

scarebus03 · Wed May 04, 2005 9:10 am

It's still a good idea as sadly some people are still being killed through cfm's on 737's. On a busy ramp it's very easy to get disorientated.
A lot of aircraft now have the lines marked only on the engine cowlings with a diagram beside so hope the engines are stopped if you're reading it!!!! Wow!

lekohawk · Wed May 04, 2005 5:11 pm

Quoting AvionicMech (Reply 4):
I think you would be very surprised Lekohawk as to quite how much air is consumed by a jet engine even at idle power.

I think you're probably right. I ask only because I have no prior experience, and I will definitely defer to your knowledge over my own assumptions.

Another Most Asked Question! 737 Line

Another Most Asked Question! 737 Line

RE: Another Most Asked Question! 737 Line

RE: Another Most Asked Question! 737 Line

RE: Another Most Asked Question! 737 Line

RE: Another Most Asked Question! 737 Line

RE: Another Most Asked Question! 737 Line

RE: Another Most Asked Question! 737 Line

RE: Another Most Asked Question! 737 Line

Who is online

Popular Searches On Airliners.net