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dom66
Topic Author
Posts: 5
Joined: Mon Apr 08, 2019 6:20 pm

DC8 55F main cargo door

Mon Apr 08, 2019 6:32 pm

Hello,
I am looking for a person who could inform me about an old aircraft the famous DC8 serie 50, and where I could find information about electrical, pneumatic and hydraulic circuit.
For the moment, here is my question.

My question is about the function of the main cargo door on DC8 55F.
Is it possible to open the cargo door without electric Ground power unit, just by the inboard battery ?? 28 vdc??
Thank you in advance for the answer.

A million apologies, guys, for my bad English
 
Max Q
Posts: 8959
Joined: Wed May 09, 2001 12:40 pm

Re: DC8 55F main cargo door

Tue Apr 09, 2019 2:02 am

Don’t know, I do know it has flown with the cargo door wide open !
The best contribution to safety is a competent Pilot.


GGg
 
dom66
Topic Author
Posts: 5
Joined: Mon Apr 08, 2019 6:20 pm

Re: DC8 55F main cargo door

Tue Apr 09, 2019 10:18 am

Max Q wrote:
Don’t know, I do know it has flown with the cargo door wide open !


???? " flown with the cargo door wide open" ???? :laughing: :banghead:
 
Max Q
Posts: 8959
Joined: Wed May 09, 2001 12:40 pm

Re: DC8 55F main cargo door

Tue Apr 09, 2019 12:32 pm

dom66 wrote:
Max Q wrote:
Don’t know, I do know it has flown with the cargo door wide open !


???? " flown with the cargo door wide open" ???? :laughing: :banghead:



Can’t link it, google ‘ DC8 cargo door open in flight ‘


No kidding
The best contribution to safety is a competent Pilot.


GGg
 
Natflyer
Posts: 655
Joined: Fri Oct 11, 2013 9:29 pm

Re: DC8 55F main cargo door

Sun Apr 14, 2019 9:30 pm

dom66 wrote:
Hello,
I am looking for a person who could inform me about an old aircraft the famous DC8 serie 50, and where I could find information about electrical, pneumatic and hydraulic circuit.
For the moment, here is my question.

My question is about the function of the main cargo door on DC8 55F.
Is it possible to open the cargo door without electric Ground power unit, just by the inboard battery ?? 28 vdc??
Thank you in advance for the answer.

A million apologies, guys, for my bad English


It’s been nearly 30 years since my DC-8 days, but I am pretty sure you need AC (ground power) to operate the door pump. There was a manual way to “pump” the door up IIRC.
 
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fr8mech
Posts: 8210
Joined: Mon Sep 26, 2005 9:00 am

Re: DC8 55F main cargo door

Sun Apr 14, 2019 11:25 pm

Natflyer wrote:

It’s been nearly 30 years since my DC-8 days, but I am pretty sure you need AC (ground power) to operate the door pump. There was a manual way to “pump” the door up IIRC.


The door can be pumped open, but there is an isolation valve in the system. I can’t remember if the valve is on the battery bus, nor can I reimburse if it had a manual override. That valve must open for the door to operate, electrically or manually.
When seconds count, the police are minutes away, or may not come at all.
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Apprentice
Posts: 778
Joined: Sat Jan 19, 2013 12:51 pm

Re: DC8 55F main cargo door

Mon Apr 15, 2019 5:54 pm

Hello: I had never dealt with a DC-8. I don’t know about similarities with DC10/ MD11
For these, to open any of the two main cargo door, You don’t need power, just a lot of Man Power., light will help to tell You when every On is on position to change to the next step, nothing more.
Turn a manual driver in two locations:
1. Locks , when Locks are completed open, (handle)
2. Latches, (turn the manual drive, till Latches are fully open)
3. Hooks. When hooks are open, door move away a little from is closed position and them, it’s time to open the door by turning manual drive a a lot, until door is completed open.
OSI: 1, use of an electrical or battery screwdriver is not allowed, it may damage mechanism due to overtorque.
2. A Placard with instructions, should be placed in every cargo door as indicated by IPC.
3. Bulk Cargo door and Pax doors 11 & 21, may be opened similar way.
Rgds
“An4; IL18; IL6; Tu5; D10; MD11; MD83; B32; B34: B37; B744; B748; B752; B763; B772; B773; B77W; A320; A332; A333; A342; A343.
"A NO" is a positive answer., "DON'T KNOW" is not. My Tutor (a wise man)
“CUBANA” 90 years Flying”
 
Apprentice
Posts: 778
Joined: Sat Jan 19, 2013 12:51 pm

Re: DC8 55F main cargo door

Mon Apr 15, 2019 5:58 pm

And last, on Dc/MD, if You do not open the door all the way up, unloading mechanism will not activate.
Rgds
“An4; IL18; IL6; Tu5; D10; MD11; MD83; B32; B34: B37; B744; B748; B752; B763; B772; B773; B77W; A320; A332; A333; A342; A343.
"A NO" is a positive answer., "DON'T KNOW" is not. My Tutor (a wise man)
“CUBANA” 90 years Flying”
 
Apprentice
Posts: 778
Joined: Sat Jan 19, 2013 12:51 pm

Re: DC8 55F main cargo door

Wed Apr 17, 2019 4:45 am

fr8mech wrote:
Natflyer wrote:

It’s been nearly 30 years since my DC-8 days, but I am pretty sure you need AC (ground power) to operate the door pump. There was a manual way to “pump” the door up IIRC.


The door can be pumped open, but there is an isolation valve in the system. I can’t remember if the valve is on the battery bus, nor can I reimburse if it had a manual override. That valve must open for the door to operate, electrically or manually.



Hello, again base on DC10, valve has an Manual position, activated with handle in door control panel. Pump, fully manually, is in the fuselaje between LH and RH Landing Gear. In fact, able to pressurized system #3, except door valve redirect pressure to door opening.

Rgds
“An4; IL18; IL6; Tu5; D10; MD11; MD83; B32; B34: B37; B744; B748; B752; B763; B772; B773; B77W; A320; A332; A333; A342; A343.
"A NO" is a positive answer., "DON'T KNOW" is not. My Tutor (a wise man)
“CUBANA” 90 years Flying”
 
dom66
Topic Author
Posts: 5
Joined: Mon Apr 08, 2019 6:20 pm

Re: DC8 55F main cargo door

Sat Apr 20, 2019 5:55 pm

Hello everyone,
Thank you for your answers, I had the information.
External power AC, only on the cabine BUS N°4 and the 115/400 pump. A handle in a floor trap, which controls a hydraulic valve
 
strfyr51
Posts: 5106
Joined: Tue Apr 10, 2012 5:04 pm

Re: DC8 55F main cargo door

Sat Apr 20, 2019 6:02 pm

dom66 wrote:
Hello,
I am looking for a person who could inform me about an old aircraft the famous DC8 serie 50, and where I could find information about electrical, pneumatic and hydraulic circuit.
For the moment, here is my question.

My question is about the function of the main cargo door on DC8 55F.
Is it possible to open the cargo door without electric Ground power unit, just by the inboard battery ?? 28 vdc??
Thank you in advance for the answer.

A million apologies, guys, for my bad English

I never worked on a DC8-55F but I have worked on the DC8-54F and the DC8-62F, the doors can be opened Electrically using a GPU Or manually by pumping the door open (A LOT of Work) I've never seen where the door could be opened with the Battery.
 
slcguy
Posts: 428
Joined: Wed Jul 09, 2008 12:09 pm

Re: DC8 55F main cargo door

Mon Apr 22, 2019 6:51 am

Max Q wrote:
dom66 wrote:
Max Q wrote:
Don’t know, I do know it has flown with the cargo door wide open !


???? " flown with the cargo door wide open" ???? :laughing: :banghead:



Can’t link it, google ‘ DC8 cargo door open in flight ‘


No kidding


Can't provide any insight on how to open the door. But a DC-8 flying with cargo door wide open did happen (not intentional of course). Apparently also happened with CV-880 and a B-757 as well. Tough birds including the cargo doors . LOL

Thread on A-net about the 757, viewtopic.php?t=581445

You can Google for the DC-8 and CV-880.
 
Apprentice
Posts: 778
Joined: Sat Jan 19, 2013 12:51 pm

Re: DC8 55F main cargo door

Sun Apr 28, 2019 5:07 am

dom66 wrote:
Hello everyone,
Thank you for your answers, I had the information.
External power AC, only on the cabine BUS N°4 and the 115/400 pump. A handle in a floor trap, which controls a hydraulic valve


Hi, (only for my experience on Dc10)
Valve is located behind Cargo Control Panel outiside fuselaje.:
In Normal mode, , moving the handle (with a latch in open position) will operates Locks and Latches with normal Hydraulic Pressure
In emergency, latch open, activating the handle, switch on “Electrical Emergency Pump”, and them, with valve open....

Do not pay much attention to my memory, in previous post, I forget to describe this past method.

The pump in a panel on fuselaje Rh side, behind Main LG Door, is MANUAL. One man operates the valve and the other. Pump and pump and....so, three methods:

1. Electro controlled hydraulic operated.
2. Manual controlled (valve position) , Emergency electro hydraulic operated.
3. Manually controlled and manually operated.

Rgds
“An4; IL18; IL6; Tu5; D10; MD11; MD83; B32; B34: B37; B744; B748; B752; B763; B772; B773; B77W; A320; A332; A333; A342; A343.
"A NO" is a positive answer., "DON'T KNOW" is not. My Tutor (a wise man)
“CUBANA” 90 years Flying”

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