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Topic Author
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737-700/800 Radio Question

Thu Jan 18, 2007 4:50 am

Stupid quick question is the radios in the 737 audible without headsets or can pilots only here transmissions via their headsets?
 
Valcory
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RE: 737-700/800 Radio Question

Thu Jan 18, 2007 6:45 am

They are speakers in the cockpit/flight deck in which you can hear audible transmission you also have the option of using the head phones.
 
IAHFLYR
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RE: 737-700/800 Radio Question

Thu Jan 18, 2007 6:46 am

There are speakers above each pilot with a volume knob on them......search some flight deck overhead panels you will see them.
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RE: 737-700/800 Radio Question

Thu Jan 18, 2007 7:59 am

thanks fellas, Im building a full size flight sim for fsx and it was just something I was thinking about while I was sitting here planning my next steps.
 
Tristarsteve
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RE: 737-700/800 Radio Question

Fri Jan 19, 2007 12:48 am

In the UK it is standard practice to wear a full headset.
In the US they use the speakers and hand held mikes.
So there I was in a MH B777, using the radio for the first time as I had to do an engine run. They had , what I thought, were headsets with very small earpieces. But I could not get it to work. Much later I found out that the headsets were just microphones with a head band to hold them on! You still had to use the loudspeakers to listen.
There is something new every week.
 
SlamClick
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RE: 737-700/800 Radio Question

Fri Jan 19, 2007 12:56 am

Quoting TristarSteve (Reply 4):
In the US they use the speakers and hand held mikes.

Only at high altitudes.

Down below ten thousand we must use headset and any mike we use must be hardwired to the cockpit voice recorder.
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Curmudgeon
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RE: 737-700/800 Radio Question

Fri Jan 19, 2007 6:24 am

Does the CVR not record the hand mics? My FCOM is mute on the issue. (Pun intended).

The 737NG that I'm familiar with suffers terribly from feedback if the speakers are set higher than barely audible. That's using either the hand mic (Electro-Voice)or the headsets. (Sennheiser)
Jets are for kids
 
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HAWK21M
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RE: 737-700/800 Radio Question

Fri Jan 19, 2007 3:43 pm

The Headsets are worn at all times.At cruise itys optional.
Its easier to Monitor Radio with them on rather that thru the Overhgead speakers.
regds
MEL
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avioniker
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RE: 737-700/800 Radio Question

Sat Jan 20, 2007 3:30 am

You need to check your wiring and system installation.
The overhead comm speaker for the side of the cockpit with the hot mic is supposed to mute automatically when the mic is keyed. Some aircraft got into the system with a "little" error in the wiring or strapping to the REU (RIU?) that causes the speaker not to mute. Others have had mods done where there wasn't enough concern paid to the proper operation of the system.
That's as polite as I'm planning on being today.
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Quoting Curmudgeon (Reply 6):
The 737NG that I'm familiar with suffers terribly from feedback if the speakers are set higher than barely audible.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
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fr8mech
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RE: 737-700/800 Radio Question

Sat Jan 20, 2007 3:54 am

Quoting TristarSteve (Reply 4):
They had , what I thought, were headsets with very small earpieces.

I believe Telex makes those. Their is a little silver bit at the bottom of one of the 'ear pieces'. That is where you connect a simple, hollow, plastic tube which in turn is connected to an ear piece.

See here

http://www.telex.com/Aircraft/Produc...ketID=2&CategoryID=13&ProductID=30
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Curmudgeon
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RE: 737-700/800 Radio Question

Sat Jan 20, 2007 4:58 am

Quoting Avioniker (Reply 8):
You need to check your wiring and system installation.
The overhead comm speaker for the side of the cockpit with the hot mic is supposed to mute automatically when the mic is keyed. Some aircraft got into the system with a "little" error in the wiring or strapping to the REU (RIU?) that causes the speaker not to mute. Others have had mods done where there wasn't enough concern paid to the proper operation of the system.

I'll pass that info on to the type guru here-thanks! Part of the problem is the goofy SOP we have that requires a speaker be on full when a pilot is off the flight deck. This is despite the known feedback problems that are the subject of many health and safety memos.
Jets are for kids
 
avioniker
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RE: 737-700/800 Radio Question

Sat Jan 20, 2007 7:51 am

Without mentioning any american airlines by name we found a number of our 800's with this problem coming through some of their early C checks and had to move some wires in the overhead junction blocks to fix it.
Good luck. Too many people don't even know about the muting requirement.
BTW your SOP is pretty common and it doesn't override the need to mute the speaker when the mic below it is keyed.
 

[Edited 2007-01-19 23:52:17]
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533

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