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HAWK21M
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Decal Above Hinge

Mon Apr 18, 2005 3:23 pm


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Whats the decal above the Aft Cargo door hinge line on this B743.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
ha763
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RE: Decal Above Hinge

Mon Apr 18, 2005 6:35 pm

I like it is a manual mechanism for the cargo door. I've seen the same thing over the forward cargo door as well. You can see that you insert a tool and turn it.
 
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HAWK21M
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RE: Decal Above Hinge

Mon Apr 18, 2005 9:26 pm

What does the decal read.Any other Pics.
regds
MEL
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dl757md
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RE: Decal Above Hinge

Mon Apr 18, 2005 10:39 pm

Not sure what this one says exactly but usually they indicate the close/open rotation directions, the number of turns required for full open, the max permissable torque, and sometimes a warning not to use impact tools.

Dl757Md
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TEBGuy
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RE: Decal Above Hinge

Tue Apr 19, 2005 8:30 am

sorry to take this off topic, but it looks like there's a smaller door aft of the cargo door. what is that, and what is it's purpose? thanks.
Remember, taking off is optional, landing is mandatory.
 
B747FE
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RE: Decal Above Hinge

Tue Apr 19, 2005 8:50 am

Dl757md es absolutely correct.

Quoting TEBguy (Reply 4):
sorry to take this off topic, but it looks like there's a smaller door aft of the cargo door. what is that, and what is it's purpose? thanks

Those are pressure relief doors. Prevent airplane pressurization if the cargo door is not correctly locked. The pressure relief doors are operated by the outer handle, which also unlocks the lower door latches and energize the electrical system control switch.

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B747FE.
"Flying is more than a sport and more than a job; flying is pure passion and desire, which fill a lifetime"
 
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CCA
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RE: Decal Above Hinge

Tue Apr 19, 2005 10:00 am

Quoting TEBguy (Reply 4):
smaller door aft of the cargo door

I assume you mean the bulk cargo door for bags and whatever that isn't put into a container.

Rgds CCA
P1 in A330, A340, A346, B742, B744, B748.
 
TEBGuy
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RE: Decal Above Hinge

Tue Apr 19, 2005 10:49 pm

Quoting CCA (Reply 6):
I assume you mean the bulk cargo door for bags and whatever that isn't put into a container.

Ah, ok, that makes sense. Thanks.
Remember, taking off is optional, landing is mandatory.
 
abbs380
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RE: Decal Above Hinge

Fri Apr 22, 2005 12:46 pm

Yes TEBguy that door aft of the big door is the access to whats called the bulk belly. As has been stated, thats where you put last minute bags or freight, its actually a fairly large compartment. Some airlines carry spare parts in there for off route charters, or tail number specific parts. As to the orig. question from HAWK21M, I forget exactly what it says but it indicates which direction to turn the drive to manually open (or close) the door. This may sound hard to believe but the door actuator is electric, when the motor does not run, for whatever reason, you can manually crank the door open from this point, of course it has to be unlocked & unlatched first. AHH, I can see you thinking -- this guy is full of BS, If you opened the door from here you would be right in the way-- its not intended that you open the door fully from here, just enough to gain access.
 
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HAWK21M
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RE: Decal Above Hinge

Fri Apr 22, 2005 1:58 pm

Quoting Abbs380 (Reply 8):
If you opened the door from here you would be right in the way-- its not intended that you open the door fully from here, just enough to gain access.

After Gaining Access how is it opened Fully.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
B747FE
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RE: Decal Above Hinge

Fri Apr 22, 2005 11:36 pm

Quoting HAWK21M (Reply 9):
After Gaining Access how is it opened Fully

Once you got access to the cargo compartment, the door can be fully open through the lift actuator manual drive socket.

Quoting TEBguy (Reply 7):

TEBguy, sorry I misunderstood your question.

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B747FE.
"Flying is more than a sport and more than a job; flying is pure passion and desire, which fill a lifetime"
 
abbs380
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RE: Decal Above Hinge

Sat Apr 23, 2005 12:37 pm

Yes, B747FE is correct. Or you could work on the drive motor, or replace it. Here/s an experience I had.-- Flt. was a cattle charter (yes, cows will fit in the belly, in special pens) so both belly doors HAD to be open on the ground because cows generate so much heat. The aft door would not open (front door is the same setup) with a speed handle we cranked the door open far enough to get to the circuit breaker, which is on the forward end of the door cutout. Sure enough the c/b was popped, reset it and the door worked normally.
 
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HAWK21M
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RE: Decal Above Hinge

Sat Apr 23, 2005 4:25 pm

Any precautionary safety feature if anything comes between the door & its Cutout during Door closure.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
air2gxs
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RE: Decal Above Hinge

Sun Apr 24, 2005 3:19 am

Quoting HAWK21M (Reply 12):
Any precautionary safety feature if anything comes between the door & its Cutout during Door closure

Nothing that will stop the door. I know of a guy who got his fingers cut clean off as he was operating the door.
 
TEBGuy
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RE: Decal Above Hinge

Sun May 01, 2005 4:35 am

That has to be a big motor, that door looks heavy. Also makes one wonder how hard it is to crank the door open/closed.
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dairbus
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RE: Decal Above Hinge

Sun May 01, 2005 11:37 am

I have opened the doors on the 757 manually a couple of times. The actual effort required is not high because the actuator has an internal gear which gives a mechanical advantage. Unfortunately, because of the gearing it takes several hundred turns to fully open and close the door. It is a tiring and time consuming process but there is no other way to open the door if the motor is not working. Thank goodness it did not happen very often.
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air2gxs
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RE: Decal Above Hinge

Sun May 01, 2005 6:51 pm

Quoting TEBguy (Reply 14):
That has to be a big motor, that door looks heavy. Also makes one wonder how hard it is to crank the door open/closed.

The actuator is not very big at all. Mechanical advantage is gained through reduction gearing. Its actually relatively easy to crank it open. Just lots and lots of revolutions. I'll see if I can come up the numbers. Same set-up is used on the main cargo door with our B747-100/200 freighters.
 
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HAWK21M
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RE: Decal Above Hinge

Mon May 02, 2005 3:17 pm

Quoting DAirbus (Reply 15):
I have opened the doors on the 757 manually a couple of times.

Can a Battery operated Drive be used or Does it Specify Manual operations only.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
air2gxs
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RE: Decal Above Hinge

Mon May 02, 2005 7:10 pm

Mel,

This caution is listed in the B757 AMM:

IF YOU USE A POWER TOOL TO OPEN THE CARGO DOOR, DO NOT TORQUE MORE THAN 225 POUND-INCHES AND DO NOT TURN FASTER THAN 500 RPM. TOO MUCH TORQUE ON THE CARGO DOOR CAN CAUSE DAMAGE.

So, yes, you can use a power tool.

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