I was revisiting a video tape of an AIRTOURS 757-200 flight from Manchester to Dalaman (spell error?) last night, and I noticed during the preflight that the nav stack on the MCP where the APR/LOC/BCRS is situated - this particular plane had BARO instead of BCRS with the light indicating "L" illuminated. What is this exactly, as I don't recall seeing it in any of the 757 cockpits I've been in??Thanks!!Neil*edit - I say "Older" in my title because the 757 had toggle switches for the A/P intsead of push actuators, so I thought it an older model.

Neil,I too have the Airtours 757 video. Its very good isnt it ? Regarding the BARO button on the MCP of that aircraft, I can tell you that BA also have this feature as well as the paddle style AP switches that this aircraft has. I think Airtours inherited some of Eastern Airlines 757s when they ceased operations, so they are now some of the oldest around. BA was also one of the original 757 customers, so I think your theory is correct. BA also have some quite recent 757s that have these features. However, I assume they only adopted them for commonality reasons with the older aircraft.Apart from BA and Airtours, I havent seen any other aircraft with these switches. Also, for your information, BA's 767 fleet has the paddle style AP switches and the BARO button on the MCP.Hope this helps you out mate.Regards,Lee Holland.BAW446Senior CaptainBoeing 757/767 FleetBritish Airways Virtual

Hi Lee,Thanks for the reply. What does the BARO button do? Set baro pressures on right and left side gauges?? How do they set up for backcourse approaches, or is it all manual? Or are they not qualified to fly them? Too many questions, right?? lol!!! Yes Lee, the video is great. I think the captain really covered most common aspects of 757 flight very well. My wife thinks I'm crazy when she see's me pop it in to watch over and over, but I learned a few things applicable to my sim flights!!Happy flying my friend,Neil

The correct full name for said switch is the "BAROMETRIC CORRECTION SELECT SWITCH"The switch actually looks something like this...http://forums.avsim.net/user_files/77766.jpgThe "L" appears when the aircraft is initially powered and indicates left altimeter barometric correction is being supplied to each air data computer.If "R" was active then right altimeter barometric correction is being supplied.To activate "R" you would press the button whilst "L" is active (opposite is true).

Hi Tom,Thanks for that mate. I was sure it had something to do with feeding the ADC's with the barometric pressure information, but thanks for clearing it up for us.What happens regarding pressure correction with the 757/767s that dont have this feature ? I assume the correction is done by the ADC's automatically without the manual switching ?Neil, its an interesting question regarding the back course approach procedure with aircraft that dont have the BCRS on the MCP. Unfortunately, I cannot give you an answer, but I am sure either Tom or some of the other gurus that frequent this forum would be able to.Regards,Lee Holland.BAW446Senior CaptainBoeing 757/767 FleetBritish Airways Virtual