Very interesting...the absence of barbers pole on speedtape and correct AT FMA annunciation(should be ARM by 800' not THR HLD) are giveaway clues that its air/gnd and NOT ground spoiler valve problem...and that they're not going anywhere but back to origin asap.If it was gnd spoiler valve then the option to continue remains providing speedbrakes are not used.Although return is preferable,you could continue flight if immediate return was tricky/impossible.Also you can silence that horn by re-selecting flaps 1...that way you can locate the cb in calm.
Sorry for the late reply. I've been very busy... Climbing to 10,000 is just to avoid using the oxygen masks. Because of the air-ground sensor failure the aircraft does not pressurize. Some pilots may prefer to diret the F/O to switch the pressurization mode to MAN e control the pressurization manually.
@@ashrafulhoque5627 , the problem is that in KBL, the airport elevation is approximately 6,000 feet and it is surround by mountains. Not the best place to have a pressurization related problem.
