ATA 23-51, Yoke Microphone Switch

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2 years 1 month ago - 2 years 1 month ago #788 by Mark
The control yoke microphone switch has two functions. When the top side is pressed it activates the "PTT" or push-to-talk for the selected communications radio. When the bottom is pressed, the flight interphone is active.

Crews do not like having to key the interphone to have normal conversation in the cockpit. It was not uncommon to see a rubber band wrapped around the switch to keep it engaged.

My airline has modified the yoke microphone switch to lock itself in the interphone position. A small ball rides up and over a mount extension.
  
  
  
  
  
A tool adjusts the height of the ball. To far up..... the switch won't lock. To far down..... and it blocks the switch from being used.
  
  
 
  
  
 
  
  
As a note: When the switch is locked in the interphone position, the cockpit speaker is muted out. It is assumed the both crew members have their headsets on for communication.
 
Last edit: 2 years 1 month ago by Mark.

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2 years 1 month ago #789 by Mark
The image of the switch above shows a switch that the ball and adjustment nut had fallen out of the switch rocker. It was being replaced at the time.

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1 year 7 months ago #833 by Mark
Locking switch part numbers.
  
  
 
  

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3 weeks 3 days ago #1477 by Diego84
Hi Mark thanks for all your helpful info about it, how "easy" could be to buy, adapt, and install these system in an aircraft?, the part number or how to find that  specific part is not clear.
I'm flying the 767, and I am also a mechanical engineer with some experience in maintenance, not in my actual company and neither certified, because it was in the Colombian Air Force 10 years ago.
I understand that there is a lot of paper work needed before making a modification to an airplane, but there are some few 767 of the fleet which was converted from PAX to Cargo, and after that conversion they became too noisy even afecting now the communications into the cockpit, especially on high power settings such as takeoff and approach, which are the most safety sensitive ones, but we as crew want to search for better solution, because we already tried to write it on the maintenance logbook, but the answer was that noise is just normal, but it is not, so now we are trying to find best solutions to this issue. 

Thanks in advance for your cooperation

Diego  C
767 Flight Crew

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3 weeks 3 days ago #1478 by Mark
I was able to help a pilot from another small airline flying 767's in Alaska get the switches installed on their aircraft.

Contact your maintenance engineering department to see if something might be done for you.

As far as cockpit noise goes..... ANR (Automatic Noise Reduction) headsets work great.
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2 weeks 1 day ago #1486 by OG GarlicSalt
Actually there is another solution, for us we dont have the toggle mod but we have small 3D printed buttons that can go on the audio select panel to hold the switch to interphone.
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2 weeks 1 day ago #1489 by Mark
Do you have a picture?

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1 week 1 day ago - 1 week 1 day ago #1493 by OG GarlicSalt
Last edit: 1 week 1 day ago by OG GarlicSalt. Reason: Delete photos

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1 week 1 day ago #1494 by Mark
Neat idea. Does the yoke mic switch override the interphone being locked down on the panel???

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1 week 1 day ago #1495 by OG GarlicSalt
Yes the other PTT buttons will still work and able to use coma normally

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