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Squares On Bottom Of 757/767  
User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Posted (11 years 2 months 3 weeks 1 day 5 hours ago) and read 3544 times:

what's the deal with the squares painted on the bottom of 757 and 767 a/c, like on the song 757 below. i've seen them many times when sitting at the approach ends of rwys. what do they mean?


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Photo © Corey Robinson




"...cannot the kingdom of salvation take me home."
11 replies: All unread, jump to last
 
User currently offlineMech24 From United States of America, joined Jul 2001, 61 posts, RR: 0
Reply 1, posted (11 years 2 months 3 weeks 1 day 5 hours ago) and read 3502 times:

That is the location of the RAT(Ram Air Turbine). Used for back up hydraulics. Will be deployed automatically by low engine RPM on both engines.

User currently offlineHAL From United States of America, joined Jan 2002, 2565 posts, RR: 53
Reply 2, posted (11 years 2 months 3 weeks 17 hours ago) and read 3414 times:

To add to what Mech24 said, the red outline is the door to the RAT. It deploys if both engines quit in flight to provide hydraulic power through the center hydraulic system to the flight controls. It also can be deployed manually by a button on the upper panel in the flight deck. The red outline is to keep people underneath the plane away from below the door. The danger comes from that button in the cockpit. The RAT is spring loaded to open RIGHT NOW when the button is pushed (or if needed when both engines go out). It is a very powerful spring, and as part of our training we are told to ALWAYS stay away from underneath that door. If it opens and hits you, you're probably dead. That's why we sometimes refer to that button as the 'Ramper Snuffer'. It's in poor taste, but accurate.

HAL



One smooth landing is skill. Two in a row is luck. Three in a row and someone is lying.
User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Reply 3, posted (11 years 2 months 3 weeks 13 hours ago) and read 3368 times:

cool, thanks .


"...cannot the kingdom of salvation take me home."
User currently offline747Teach From United States of America, joined Nov 2000, 176 posts, RR: 1
Reply 4, posted (11 years 2 months 3 weeks 7 hours ago) and read 3293 times:

Cancidas: As the others pointed out, the square outline on the bottom of the fairings is the RAT door. On the 757, the arm that supports the RAT is extended by a spring actuator, and retracted by hydraulic pressure. It can extend very quickly (757 AMM 29-21-00). The RAT on the 767 is extended and retracted by the extend/retract electric motor on the top of the pivot arm, and actually drives out relatively slowly (767 AMM 29-00-05). Regards,

User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Reply 5, posted (11 years 2 months 3 weeks 6 hours ago) and read 3263 times:

whats the AMM 29-21-00?


"...cannot the kingdom of salvation take me home."
User currently offlineAtlamt From United States of America, joined Sep 2001, 240 posts, RR: 3
Reply 6, posted (11 years 2 months 3 weeks 4 hours ago) and read 3251 times:

It's stands for Aircraft Maintenance Manual the chapter and sub-chapters. Chapter 29 is Hydraulic Power.


Fwd to MCO and Placard
User currently offlineOkie From United States of America, joined Jul 2003, 3102 posts, RR: 3
Reply 7, posted (11 years 2 months 3 weeks 1 hour ago) and read 3224 times:

So how many times has anyone seen a RAT deployed in flight?

User currently offlineCovert From Ghana, joined Oct 2001, 1452 posts, RR: 2
Reply 8, posted (11 years 2 months 2 weeks 6 days 22 hours ago) and read 3206 times:

Okie,

There are quite a few pictures of the RAT deployed in the database.



thank goodness for TCAS !
User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 9, posted (11 years 2 months 2 weeks 6 days 14 hours ago) and read 3190 times:

So how many times has anyone seen a RAT deployed in flight?

At AAL, on all Functional Check Flights after heavy maintenance (MBV or C Check), to check correct operation.




"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineAussiePete From Australia, joined May 2003, 72 posts, RR: 0
Reply 10, posted (11 years 2 months 2 weeks 4 days 21 hours ago) and read 3116 times:

I flew an approach into YSSY on the 767 sim with only the RAT deployed and both engines shutdown. Lets' just say that it's a dire time indeed when it happens for real. Not very responsive flying but it does the job.

I imagine that the Air Canada flight that ran out of fuel and landed on a racetrack a few years ago had the RAT deployed.


User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 51
Reply 11, posted (11 years 2 months 2 weeks 4 days 13 hours ago) and read 3088 times:

Here's the said device in all her glory:


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Photo © John Patchett



Wouldn't fancy that slicing my head open on a walkaround...

Viewing this picture in large shows the RAT deployed on a test flight.


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Photo © JOE G. WALKER




I used to love the smell of Jet-A in the morning...
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