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727 Cockpit Question  
User currently offlineEDDM From Germany, joined Feb 2005, 222 posts, RR: 0
Posted (8 years 5 months 3 weeks 6 days 7 hours ago) and read 3216 times:


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

Thank you!

22 replies: All unread, jump to last
 
User currently offlineL-188 From United States of America, joined Jul 1999, 29799 posts, RR: 58
Reply 1, posted (8 years 5 months 3 weeks 6 days 6 hours ago) and read 3211 times:

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.



OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineJamesbuk From United Kingdom, joined May 2005, 3968 posts, RR: 4
Reply 2, posted (8 years 5 months 3 weeks 6 days 6 hours ago) and read 3210 times:

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--



You cant have your cake and eat it... What the hells the point in having it then!!!
User currently offlinePeterpuck From Canada, joined Jun 2004, 323 posts, RR: 3
Reply 3, posted (8 years 5 months 3 weeks 6 days 6 hours ago) and read 3210 times:

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.

User currently offlineEDDM From Germany, joined Feb 2005, 222 posts, RR: 0
Reply 4, posted (8 years 5 months 3 weeks 6 days 6 hours ago) and read 3189 times:

Perfect. And promptly, too. Again, thank you very much.

User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 5, posted (8 years 5 months 3 weeks 6 days 5 hours ago) and read 3162 times:
AIRLINERS.NET CREW
DATABASE EDITOR



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
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17039 posts, RR: 66
Reply 6, posted (8 years 5 months 3 weeks 6 days 5 hours ago) and read 3162 times:

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."
User currently offlineMD11Engineer From Germany, joined Oct 2003, 14026 posts, RR: 62
Reply 7, posted (8 years 5 months 3 weeks 6 days 5 hours ago) and read 3157 times:

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


User currently offlineMatt72033 From United Kingdom, joined May 2005, 1617 posts, RR: 4
Reply 8, posted (8 years 5 months 3 weeks 6 days 4 hours ago) and read 3146 times:

how many bottles do tri jets have?
i'm guessing 3? that can be discharged to any engine!


User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 9, posted (8 years 5 months 3 weeks 6 days 4 hours ago) and read 3138 times:
AIRLINERS.NET CREW
DATABASE EDITOR

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
User currently offlineGreasespot From Canada, joined Apr 2004, 3084 posts, RR: 20
Reply 10, posted (8 years 5 months 3 weeks 6 days 4 hours ago) and read 3135 times:

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?"
User currently offlineFr8Mech From United States of America, joined Sep 2005, 5418 posts, RR: 14
Reply 11, posted (8 years 5 months 3 weeks 6 days 2 hours ago) and read 3116 times:

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.
User currently offlineJoness0154 From United States of America, joined Nov 2005, 667 posts, RR: 0
Reply 12, posted (8 years 5 months 3 weeks 6 days 2 hours ago) and read 3107 times:

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.



I don't have an attitude problem. You have a perception problem
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17039 posts, RR: 66
Reply 13, posted (8 years 5 months 3 weeks 6 days 1 hour ago) and read 3089 times:

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."
User currently offlineFr8Mech From United States of America, joined Sep 2005, 5418 posts, RR: 14
Reply 14, posted (8 years 5 months 3 weeks 6 days 1 hour ago) and read 3089 times:

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.
User currently offlineEssentialPowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 15, posted (8 years 5 months 3 weeks 5 days 19 hours ago) and read 3011 times:

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...


User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 16, posted (8 years 5 months 3 weeks 5 days 16 hours ago) and read 2974 times:

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



Think of the brighter side!
User currently offlineFr8Mech From United States of America, joined Sep 2005, 5418 posts, RR: 14
Reply 17, posted (8 years 5 months 3 weeks 5 days 11 hours ago) and read 2935 times:

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.
User currently offlineEssentialPowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 18, posted (8 years 5 months 3 weeks 5 days 6 hours ago) and read 2899 times:

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.


User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 19, posted (8 years 5 months 3 weeks 4 days 21 hours ago) and read 2815 times:

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

Thanks for correcting me.You learn things every day.
regds
MEL



Think of the brighter side!
User currently offline113312 From United States of America, joined Apr 2005, 572 posts, RR: 1
Reply 20, posted (8 years 5 months 3 weeks 3 days 23 hours ago) and read 2729 times:

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


User currently offlineAirgypsy From United States of America, joined Nov 1999, 130 posts, RR: 2
Reply 21, posted (8 years 5 months 3 weeks 3 days 22 hours ago) and read 2720 times:

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


User currently offlineEssentialPowr From United States of America, joined Sep 2000, 1820 posts, RR: 2
Reply 22, posted (8 years 5 months 3 weeks 3 days 22 hours ago) and read 2711 times:

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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