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Hydraulic Lines Run Through Passenger Section?  
User currently offlineCTR From United States of America, joined Jul 2005, 303 posts, RR: 0
Posted (7 years 11 months 6 days 3 hours ago) and read 3148 times:

On pressurized cabin civil aircraft carrying approx 100 to 120 passengers, are hydraulic lines for controls and landing gear run through the cabin? Or are they some way isolated from the cabin in the event of a leak.

My background is as an engineer on military aircraft (F/A-18, AV-8B, F-15) where all flammable fluids running in the cockpit are prohibited by MIL Spec. Recently however I started working on a new passenger aircraft with an ex Boeing engineer, and he claims that Boeing runs hydraulics through the pressurized passenger and pressurized cargo cabin sections all the time.

Is this true?

Take care,

CTR


Aircraft design is just one big compromise,,,
16 replies: All unread, jump to last
 
User currently offlineBoston92 From United States of America, joined Aug 2006, 3390 posts, RR: 7
Reply 1, posted (7 years 11 months 6 days 2 hours ago) and read 3106 times:

I really don't know, but on one Sun Country Flight I was on, one of the overhead bins, had no backing on it, and there was stuff that sure looked like hydrolics.


"Why does a slight tax increase cost you $200 and a substantial tax cut save you 30 cents?"
User currently offlineTristarsteve From Sweden, joined Nov 2005, 3980 posts, RR: 34
Reply 2, posted (7 years 11 months 6 days 2 hours ago) and read 3100 times:

Yes hydraulic and fuel lines run through the pressure cabin.
The fuel lines are shrouded and any leaks go overboard via a tell tale, but the hyd lines run through the freight holds.


User currently offlineOldAeroGuy From United States of America, joined Dec 2004, 3476 posts, RR: 67
Reply 3, posted (7 years 11 months 6 days 2 hours ago) and read 3058 times:

Quoting CTR (Thread starter):
Boeing runs hydraulics through the pressurized passenger and pressurized cargo cabin sections all the time.

It's hard to keep hydraulic lines running to the nose gear actuator/steering or the elevators/stab trim/rudder out of the pressure vessel without external fairings. However, they are seldom in the passenger area per se. The cargo hold is a more common location.

Airbus and Boeing have addressed this design issue in similar manners.

[Edited 2006-08-27 20:37:48]


Airplane design is easy, the difficulty is getting them to fly - Barnes Wallis
User currently offlineMCIGuy From United States of America, joined Mar 2006, 1936 posts, RR: 0
Reply 4, posted (7 years 11 months 6 days 2 hours ago) and read 3048 times:

I don't know about civvie's, but it's done in military transports all the time. If you've ever been up in a C-5 there are lines running everywhere.  Smile


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User currently offlineTroubleshooter From Germany, joined Feb 2005, 423 posts, RR: 5
Reply 5, posted (7 years 11 months 5 days 13 hours ago) and read 2829 times:

I remember one accident with a BAe146 where a hydraulic line wich was routed through the passenger cabin failed and several passengers were injured by the skydrol and its fumes. Unfortunately, I can´t find any details...


This job sucks!!! I love this job!!!
User currently offline777WT From United States of America, joined Jan 2005, 875 posts, RR: 1
Reply 6, posted (7 years 11 months 5 days 13 hours ago) and read 2821 times:

Yes the same holds true for the ERJ-145.

User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 7, posted (7 years 11 months 5 days 12 hours ago) and read 2815 times:

http://www.aaib.dft.gov.uk/sites/aai...h='bae%20146%20hydraulic%20leak'
regds
MEL



Think of the brighter side!
User currently offlineLucky42 From , joined Dec 1969, posts, RR:
Reply 8, posted (7 years 11 months 5 days 12 hours ago) and read 2804 times:

Really the only time you really need to be worried about skydrol in the cabin is on the high wing aircraft like the bae146/RJ-85 Mesaba had it happen not all that long ago on an RJ-85.

User currently offlineAvt007 From Canada, joined Jul 2000, 2132 posts, RR: 5
Reply 9, posted (7 years 11 months 4 days 8 hours ago) and read 2600 times:

"Really the only time you really need to be worried about skydrol in the cabin is on the high wing aircraft like the bae146/RJ-85 Mesaba had it happen not all that long ago on an RJ-85."
I have seen leaks like that on a Dash8, but a worse scenario happened on an F28 where a susbstantial leak caused a skydrol mist to spread through the cabin. Of course the F28 is unusual in having the hydraulic manifolds inside the fuselage.


User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 10, posted (7 years 11 months 4 days 4 hours ago) and read 2553 times:

Quoting Avt007 (Reply 9):
Of course the F28 is unusual in having the hydraulic manifolds inside the fuselage.

What systems were these routed to.
regds
MEL



Think of the brighter side!
User currently offlineSilentbob From United States of America, joined Aug 2006, 2051 posts, RR: 1
Reply 11, posted (7 years 11 months 4 days 2 hours ago) and read 2531 times:

You see leaks in the Dash cabins all the time.

User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 12, posted (7 years 11 months 3 days 20 hours ago) and read 2433 times:

I haven't been around military aircraft for a good many years, but they used 5606 then, compared to commercial aircraft using skydrol.


Not as easy as originally perceived
User currently offlineTroubleshooter From Germany, joined Feb 2005, 423 posts, RR: 5
Reply 13, posted (7 years 11 months 3 days 18 hours ago) and read 2410 times:

This was the report I was referring to: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20050616X00793&key=1


This job sucks!!! I love this job!!!
User currently offlineSfomb67 From United States of America, joined Dec 2005, 417 posts, RR: 0
Reply 14, posted (7 years 11 months 2 days 22 hours ago) and read 2325 times:

I am surprised that they would route the hyd lines in the ceiling. I think it's pretty common to have them under the cabin floorboards, though. Yes, the passengers would have a hard time breathing with a cracked hyd line atomising skydrol in the cabin. I'm sure they won't forget that experience for awhile.


Not as easy as originally perceived
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 15, posted (7 years 11 months 2 days 22 hours ago) and read 2319 times:

As of the Saab 340.. the answer is No. There are no hydraulic lines in the passenger cabin. I can only guess that the Saab 200 is the same, but I don't know for sure.


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineStarlionblue From Greenland, joined Feb 2004, 16999 posts, RR: 67
Reply 16, posted (7 years 11 months 2 days 21 hours ago) and read 2309 times:

Quoting Sfomb67 (Reply 14):
am surprised that they would route the hyd lines in the ceiling. I think it's pretty common to have them under the cabin floorboards, though. Yes, the passengers would have a hard time breathing with a cracked hyd line atomising skydrol in the cabin. I'm sure they won't forget that experience for awhile.

With a high winged aircraft, you pretty much have to run lines in the ceiling.



"There are no stupid questions, but there are a lot of inquisitive idiots."
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