Shortly after take off I get buzzer and warning light on FO side for Overhead. Look up and Pass OXY ON light is on; note this is were the fuss panel needs to be functional, lol. I finally had to hit the sound so i could dig through the pdf - but i'm not getting the logic behind this book. Paasengers and crew all be dead if i was having to figure it out. the busser finally went of when i switched to the alternate pressurization. If that was the problem shouldn't there be a light for that, lol? EDIT: Ok, after reviewing the aircraft manuals I really gotta think that there should have been a warning light if the pressurization unit failed that i had to manually switch to the alternate system. Someone correct me if i'm wrong. Overhead light indicated alarm in overhead - only light illuminated was PASS OYX ON which says mask deployed and oxygen was on.

Edited August 8, 201114 yr by wildwally

Did you ever get an answer? I had the same thing happen to me. I was going bonkers with the alarm, I did finally silence it with the "ALT HORN CUTOUT" button. I'm still not sure why the "PASS OXY ON" turned on in the first place. Then the overhead air conditioner started to fail, maybe related.

The only logic answeres that you havent set your cruise altitude or PACKS/Bleed Air is off.

I thought I set the cruise alttitude but maybe forgot, I did see the "auto fail" light ON when I was searching for the alarm, I then switched to the alternate and finally manual. After a while I was able to go back to auto. The "PASS OXY ON" light remained on and I can't find a way to reset it. Thanks in advance for the help

Shortly after take off I get buzzer and warning light on FO side for Overhead. Look up and Pass OXY ON light is on; note this is were the fuss panel needs to be functional, lol. I finally had to hit the sound so i could dig through the pdf - but i'm not getting the logic behind this book. Paasengers and crew all be dead if i was having to figure it out. the busser finally went of when i switched to the alternate pressurization. If that was the problem shouldn't there be a light for that, lol? EDIT: Ok, after reviewing the aircraft manuals I really gotta think that there should have been a warning light if the pressurization unit failed that i had to manually switch to the alternate system. Someone correct me if i'm wrong. Overhead light indicated alarm in overhead - only light illuminated was PASS OYX ON which says mask deployed and oxygen was on.

The buzzer you heard was probably the Cabin Altitude Warning. And Can be switched off the Alt Horn Cut Out Switch on the Overhead. Hearing the horn post 10,000 feet is basically when your cabin altitude is climbing leading to a rapid Depressurization. After which you need to accomplish the cabin altitude warning/rapid depressurization checklist. About your passengers being dead - Yes, thats why the checklist is a memory item and to be memorized so that we dont have to look around in the QRH. If its coming after take-off which is a bit weird, and shouldnt ! It may come just as you set take off thrust, which may be a take-off config warning, where your flaps arent in take off range/asymmetry, stabs not in trim range/parking brake set etc.

Ensure that your packs and bleed switches are in the ON position and observe the cabin vertical rate during your climb out. This cabin rate should not exceed ~300-800 FPM (from memory).