Audio Control Panel Mystery.
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Join Date: Jul 1999
Location: 58-33N. 00-18W. Peterborough UK
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Audio Control Panel Mystery.
I asked this some time ago but never did get an answer I understood. Audio Control Panels below were fitted (at least) to BA 757s for MLS trials. Question is - How do you select/de-select Marker Audio?
It’s an Avtech 5051-1-5. I’m told by the manufacturer (who thinks!) that ………… you can turn off the ILS/MLS received audio so that only the MB will be present. This is accomplished by repeatedly pushing the ILS/MLS Vol Control switch until the ILS/MLS LEDs (right, center, left) are off.
This all sounds very iffy. For a start, there’s no MB Placard. Anyone out there with a MB Test Set and an ex MLS trials aircraft handy. Forever grateful!
It’s an Avtech 5051-1-5. I’m told by the manufacturer (who thinks!) that ………… you can turn off the ILS/MLS received audio so that only the MB will be present. This is accomplished by repeatedly pushing the ILS/MLS Vol Control switch until the ILS/MLS LEDs (right, center, left) are off.
This all sounds very iffy. For a start, there’s no MB Placard. Anyone out there with a MB Test Set and an ex MLS trials aircraft handy. Forever grateful!
Thread Starter
Join Date: Jul 1999
Location: 58-33N. 00-18W. Peterborough UK
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Answering my own question here. Info from manufacturer. The Marker Audio is ON whenever any of the three ILS/MLS channels are selected. Marker Volume is not adjustable but is pre-set external to the Audio Selector Panel.
So, to hear the Marker Audio you have to - Select any ILS/MLS channel, light on, and turn down the volume to get rid of any ILS Ident that may be there.
This has to be the worst/clumsiest audio design of all time
!
So, to hear the Marker Audio you have to - Select any ILS/MLS channel, light on, and turn down the volume to get rid of any ILS Ident that may be there.
This has to be the worst/clumsiest audio design of all time
!
