EDDM
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727 Cockpit Question

Sun Mar 26, 2006 4:03 am


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What are the rectangular red buttons marked 1, 2 and 3?

Thank you!
 
L-188
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RE: 727 Cockpit Question

Sun Mar 26, 2006 4:10 am

I am not a 727 pilot, but I belive those are the fire warning lights, 1-2-3 engines 1-2-3 lights.

I don't know how the system works exactly, but most systems work on a similar theme. Get a fire like, pull the lighted handle to direct the fire bottles and then shoot the bottle into the engines.
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jamesbuk
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RE: 727 Cockpit Question

Sun Mar 26, 2006 4:12 am

Those are fire alarms so if theres a fire in and engine then that is pulled and its sets off an extinguisher in the engine, No1 is the left side, No2 is the top and NO3 is the right.

Rgds --James--
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peterpuck
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RE: 727 Cockpit Question

Sun Mar 26, 2006 4:14 am

They are fire switches. Thet illuminate to warn of a fire in engine 1,2, or 3. Pulling the switch shuts off fuel, hydraulics, and bleed air of the affected engine. It also arms the fire extinguishing system.
 
EDDM
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RE: 727 Cockpit Question

Sun Mar 26, 2006 4:38 am

Perfect. And promptly, too. Again, thank you very much.
 
2H4
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RE: 727 Cockpit Question

Sun Mar 26, 2006 5:48 am



IIRC, pulling one of the red knobs shuts the respective engine down and isolates it from the fuel and electrical systems. After pulling the knob, twisting it blows one of the fire bottles for that engine. Twisting the knob the other way blows the second bottle.

This is based on my memory of the 737 system...not sure if the 727 operates the same way.




2H4


Intentionally Left Blank
 
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Starlionblue
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RE: 727 Cockpit Question

Sun Mar 26, 2006 5:50 am

Quoting 2H4 (Reply 5):
IIRC, pulling one of the red knobs shuts the respective engine down and isolates it from the fuel and electrical systems. After pulling the knob, twisting it blows one of the fire bottles for that engine. Twisting the knob the other way blows the second bottle.

IIRC the MD-8x is the same system .
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
MD11Engineer
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RE: 727 Cockpit Question

Sun Mar 26, 2006 5:59 am

Quoting 2H4 (Reply 5):
IIRC, pulling one of the red knobs shuts the respective engine down and isolates it from the fuel and electrical systems. After pulling the knob, twisting it blows one of the fire bottles for that engine. Twisting the knob the other way blows the second bottle.

This is based on my memory of the 737 system...not sure if the 727 operates the same way.




2H4

You are correct. The only additional function they have is to isolate the peumatics systems as well (closing the PRSOV). You don't want a fire to be fanned by hot air from the pneumatic duct.

Jan
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Matt72033
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RE: 727 Cockpit Question

Sun Mar 26, 2006 6:35 am

how many bottles do tri jets have?
i'm guessing 3? that can be discharged to any engine!
 
2H4
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RE: 727 Cockpit Question

Sun Mar 26, 2006 7:01 am

Quoting MD11Engineer (Reply 7):
The only additional function they have is to isolate the peumatics systems as well

Thanks, Jan...forgot about pneumatics.




Quoting Matt72033 (Reply 8):
how many bottles do tri jets have?
i'm guessing 3?

IIRC, on the 737, it was two bottles per engine.




2H4

[Edited 2006-03-25 23:08:12]
Intentionally Left Blank
 
greasespot
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RE: 727 Cockpit Question

Sun Mar 26, 2006 7:07 am

Now I am going from memory. It has been a while since i last peeked in the stariwell....

There are 2 bottles in a B727 in total...

GS
Sometimes all you can do is look them in the eye and ask " how much did your mom drink when she was pregnant with you?"
 
fr8mech
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RE: 727 Cockpit Question

Sun Mar 26, 2006 8:21 am

Quoting Greasespot (Reply 10):
There are 2 bottles in a B727 in total...

Actually, there are 3. Don't forget the APU fire bottle in the left wheelwell/wingroot area. Just being my normal smartass self.

Quoting 2H4 (Reply 5):
After pulling the knob, twisting it blows one of the fire bottles for that engine. Twisting the knob the other way blows the second bottle.

As I recall, after pulling the handle, you expose a push button switch which is used to discharge the bottle. To fire the second bottle, you flip the transfer switch (between the 1 and 2 fire handles) and then press the same button again.
When seconds count...the police are minutes away.
 
joness0154
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RE: 727 Cockpit Question

Sun Mar 26, 2006 8:38 am

I love the "GPS for VFR use only" placard. You'd think that with the mediocre African airspace system that it would almost be a necessity.

Its no wonder every single one of Congo's airlines is banned from the EU.
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Starlionblue
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RE: 727 Cockpit Question

Sun Mar 26, 2006 9:29 am

Quoting Fr8Mech (Reply 11):
Quoting Greasespot (Reply 10):
There are 2 bottles in a B727 in total...

Actually, there are 3. Don't forget the APU fire bottle in the left wheelwell/wingroot area. Just being my normal smartass self.

I'll be a smartass too and say that since the APU was not standard on the earliest models (but as a retrofit) it's possible some still just have 2  Wink
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
fr8mech
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RE: 727 Cockpit Question

Sun Mar 26, 2006 9:32 am

Quoting Starlionblue (Reply 13):
I'll be a smartass too and say that since the APU was not standard on the earliest models (but as a retrofit) it's possible some still just have 2

I've worked one or two vintage B727 and have never seen one without the APU, but I guess there may be one or two.
When seconds count...the police are minutes away.
 
EssentialPowr
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RE: 727 Cockpit Question

Sun Mar 26, 2006 3:16 pm

Fr8Mech is correct; the switches do not rotate.

Pulling a switch:

arms the discharge valve
closes the fuel shut off valve
closes anti ice and bleed valves
trips the generator field relay
closes the hyd shut off valve and deactivates the associated pump low pressure light for #1 and #2.

As I've stated many times about the 727, it was the whipping boy of human factors. Some models of the 727 were delivered with fire switches in the over head, vs the glare shield, and have further differences than those noted above...
 
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HAWK21M
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RE: 727 Cockpit Question

Sun Mar 26, 2006 6:23 pm

The fire handles normally have two types of switches installed in the Handle assy.The Horizontal switches that make contact when the handle is pulled,which supplies current to the shutting down of the critical system components as mentioned above.
The rotary switches discharge the Squib on the respective fire extinguisher bottles.
This is a good LINK
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
fr8mech
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RE: 727 Cockpit Question

Mon Mar 27, 2006 12:00 am

Quoting HAWK21M (Reply 16):
The rotary switches discharge the Squib on the respective fire extinguisher bottles

Not on the B727. As stated, there is a push button below each fire handle that is used to discharge the bottle.
When seconds count...the police are minutes away.
 
EssentialPowr
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RE: 727 Cockpit Question

Mon Mar 27, 2006 4:14 am

Quoting HAWK21M (Reply 16):
The fire handles normally have two types of switches installed in the Handle assy.The Horizontal switches that make contact when the handle is pulled,which supplies current to the shutting down of the critical system components as mentioned above.
The rotary switches discharge the Squib on the respective fire extinguisher bottles.
This is a good LINK

Hawk21m, you are incorrect. Under the "fire protection" section of the link you provided, is this:

"A selector valve is installed for each engine to control the direction of flow of the extinguishing agent. Pulling a fire shutoff handle arms the associated selector valve. When the discharge button is pushed. The extinguishing agent flows through the selector valve to the appropriate engine."

The fire switches on the 727 do not rotate.
 
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HAWK21M
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RE: 727 Cockpit Question

Mon Mar 27, 2006 2:06 pm

Quoting EssentialPowr (Reply 18):
The fire switches on the 727 do not rotate.

Thanks for correcting me.You learn things every day.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
113312
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RE: 727 Cockpit Question

Tue Mar 28, 2006 12:00 pm

I'll also add my 2 cents. Some of the later production 727s had the Fire Switches/Handles located on the overhead panel instead of the glareshield. This change was also incorporated in some late model 707s as well. This gave easier access to the flight engineer (second officer) for those airlines whose procedures might task that crewmember with the actual pulling of the switch.

It's also worth a comment that the power source for the actual firing of the fire bottle squib was an option. At least one airline opted for fire bottles to be fired from the "hot battery" bus.

EMC
 
Airgypsy
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RE: 727 Cockpit Question

Tue Mar 28, 2006 12:20 pm

Those three little lights? Those innocuous little handles? When they illuminate and the warning sounds - they are the biggest objects in the cockpit. Time slows down, your palms sweat and you get the feeling (instantly) that you want to be SOMEWHERE ELSE!
Try standing in the wheel well when the APU fire warning sounds. Not hurting yourself while figuring out where your remote parts are located is a challenge.
Just those little lights? (LOL)
Airgypsy
 
EssentialPowr
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RE: 727 Cockpit Question

Tue Mar 28, 2006 12:38 pm

Quoting EssentialPowr (Reply 15):
As I've stated many times about the 727, it was the whipping boy of human factors. Some models of the 727 were delivered with fire switches in the over head, vs the glare shield, and have further differences than those noted above...

EMC, is there an echo in here???

Cheers-

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