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What Is Special With The Red Squares?  
User currently offlineB777Neuss From Germany, joined Aug 2007, 155 posts, RR: 0
Posted (6 years 7 months 1 week 3 days 11 hours ago) and read 3831 times:

So my next question,
on some aircraft I have seen red squares on top of the fuselage with the words "cut here in emergency". Is there something special under the skin, e.g. are there less stringers (what I don´t believe) or no air conditioning tubes? And whose decision is it to mark these areas?, not every airline has this squares.

15 replies: All unread, jump to last
 
User currently offlineKELPkid From United States of America, joined Nov 2005, 6265 posts, RR: 3
Reply 1, posted (6 years 7 months 1 week 3 days 10 hours ago) and read 3810 times:

It's a marking for ARFF (Airport Rescue & Fire Fighting) crews to know where to cut in case it is necessary to rescue individuals trapped inside the airframe. And yes, indeed, there are usually less stringers in the areas marked  Smile


Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 2, posted (6 years 7 months 1 week 3 days 10 hours ago) and read 3806 times:

You answered your own question. It's just the easiest area to cut in case of an emergency. As for why...? I only see it on some airlines from Europe and not in the US. Maybe something to do with regulations.


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineRwessel From United States of America, joined Jan 2007, 2238 posts, RR: 2
Reply 3, posted (6 years 7 months 1 week 3 days 2 hours ago) and read 3678 times:
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On some aircraft the "cut here" lines avoid potentially dangerous items inside the aircraft. For example, aircraft with ejection seats will typically have a number of pyrotechnic devices scattered around the cockpit to do things like sever lines, blow/shatter the canopy, etc. (in addition to the seat rocket, of course). Also, things like high pressure oxygen lines are best avoided, and some aircraft have fuel lines and other nasties in that general vicinity.

User currently offlineViscount724 From Switzerland, joined Oct 2006, 24084 posts, RR: 22
Reply 4, posted (6 years 7 months 1 week 3 days 1 hour ago) and read 3656 times:

But why do those "cut here in emergency" markings exist only on aircraft of certain airlines, even when operating the identical type? Many carriers do not have such markings on their aircraft. US or Canadian carriers don't have them to the best of my recollection and the same is true for many European carriers

I am guessing that it may be a regulatory requirement of certain governments only.


User currently offlineHAWK21M From India, joined Jan 2001, 31576 posts, RR: 57
Reply 5, posted (6 years 7 months 1 week 2 days 19 hours ago) and read 3587 times:

Quoting Viscount724 (Reply 4):
Many carriers do not have such markings on their aircraft

Any Examples.

Quoting Viscount724 (Reply 4):
I am guessing that it may be a regulatory requirement of certain governments only.

Out here its mandatory.

regds
MEL



Think of the brighter side!
User currently offlineB777Neuss From Germany, joined Aug 2007, 155 posts, RR: 0
Reply 6, posted (6 years 7 months 1 week 2 days 8 hours ago) and read 3474 times:

For example LH.


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Quoting HAWK21M (Reply 5):


User currently offlineViscount724 From Switzerland, joined Oct 2006, 24084 posts, RR: 22
Reply 7, posted (6 years 7 months 1 week 2 days 8 hours ago) and read 3472 times:

Quoting HAWK21M (Reply 5):
Quoting Viscount724 (Reply 4):
Many carriers do not have such markings on their aircraft

Any Examples.

Try and find an A.net photo of a US or Canadian-registered aircraft with the "cut here in emergency" markings. And I am almost certain that KL/LH/LX aircraft do not have them, which seems to be confirmed by a quick photo search. I think that carriers with those markings are in the minority.

I have a feeling that the requirement may date back to some historic British requirement and was adopted mainly by certain carriers that had close links to the UK or copied their regulations. Kuwait Airways, for example, has those markings on their aircraft and Kuwait was a British protectorate until 1961.


User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 8, posted (6 years 7 months 1 week 2 days 4 hours ago) and read 3389 times:

Quoting Rwessel (Reply 3):
Also, things like high pressure oxygen lines are best avoided,

Most aircraft built since the early 1980s don't have plumbed oxygen systems like the earlier aircraft did--the newer ones use chemical oxygen generators in the PSUs overhead of the seats.

Quoting Rwessel (Reply 3):
and some aircraft have fuel lines and other nasties in that general vicinity.

I can't think of single aircraft that had fuel lines running above a passenger compartment. Check that, the Shorts 330/360 turboprops have a damn tank up there. (Never did make much sense to me--putting fuel above passengers where it could potentially leak on passengers below...)

Don't know what to attribute the different marking rules to.. I've see diagrams for the ARFF folks that tell them where the critical stuff, so they know where to look/cut, even if the markings aren't there...


User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 9, posted (6 years 7 months 1 week 2 days 3 hours ago) and read 3387 times:
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Quoting OPNLguy (Reply 8):
Never did make much sense to me--putting fuel above passengers where it could potentially leak on passengers below...

I've often wondered about Cessna's logic in placing ashtrays mere inches from fuel lines in the 172/182/etc...


2H4




Intentionally Left Blank
User currently offlineHAWK21M From India, joined Jan 2001, 31576 posts, RR: 57
Reply 10, posted (6 years 7 months 1 week 2 days ago) and read 3345 times:

Quoting Viscount724 (Reply 7):
Try and find an A.net photo of a US or Canadian-registered aircraft with the "cut here in emergency" markings. And I am almost certain that KL/LH/LX aircraft do not have them, which seems to be confirmed by a quick photo search

What does the F.A.R. say
regds
MEL



Think of the brighter side!
User currently offlineKELPkid From United States of America, joined Nov 2005, 6265 posts, RR: 3
Reply 11, posted (6 years 7 months 1 week 1 day 23 hours ago) and read 3335 times:

Quoting 2H4 (Reply 9):
I've often wondered about Cessna's logic in placing ashtrays mere inches from fuel lines in the 172/182/etc...


2H4

What kind of idiot smokes in a Cessna, anyways? Good way to run up your avionics and vacuum powered gyro repair bill, not to mention destroy the interior  yuck 



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineKELPkid From United States of America, joined Nov 2005, 6265 posts, RR: 3
Reply 12, posted (6 years 7 months 1 week 1 day 14 hours ago) and read 3268 times:

Quoting OPNLguy (Reply 8):
I can't think of single aircraft that had fuel lines running above a passenger compartment. Check that, the Shorts 330/360 turboprops have a damn tank up there. (Never did make much sense to me--putting fuel above passengers where it could potentially leak on passengers below...)

I would imagine that all high wing types are in the same boat-Dash 8's, ATR's, Doriner 327/328, BAE 146, etc.  Wink



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 13, posted (6 years 7 months 1 week 1 day 3 hours ago) and read 3162 times:
AIRLINERS.NET CREW
HEAD DATABASE EDITOR

Quoting KELPkid (Reply 11):
What kind of idiot smokes in a Cessna, anyways?

Everyone does....even kids!


Signed,

The 1960s and 1970s.




Intentionally Left Blank
User currently offlineLongHauler From Canada, joined Mar 2004, 4764 posts, RR: 43
Reply 14, posted (6 years 7 months 1 week 15 hours ago) and read 3039 times:

What therefore, is the pseudo outline in the forward left side if Air Canada's Embrarers:


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And the rear right side:


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Photo © Keith Wahamaki



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Photo © Andrew Hunt - AirTeamImages



It doesn't technically say "cut here" on these aircraft, but it does appear to be so.



Never gonna grow up, never gonna slow down .... Barefoot Blue Jean Night
User currently offlineViscount724 From Switzerland, joined Oct 2006, 24084 posts, RR: 22
Reply 15, posted (6 years 7 months 6 days 2 hours ago) and read 2818 times:

Quoting LongHauler (Reply 14):
What therefore, is the pseudo outline in the forward left side if Air Canada's Embrarers:

That's interesting. Wonder why it's only on the Embraers? Haven't noticed anything similar on larger AC types.


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