Coool Hand Luke
Well-known member
- Joined
- May 7, 2006
- Posts
- 857
At 135 ground school the instructor said the logic behind the difference in O2 requirements for 121 and 135 was due to the difference in the size of the equipment. An airliner being larger, a pressurization leak would not be as bad as a leak on a the normal 135 airplane. I realize the legacy is mostly a 121 airplane that flops just uses as a 135 airplane, but the regs clearly state over FL350 in 135 service one crewmember must be wearing the mask. If the feds change the rules then no problem. Until then you do what a professional pilot does, fly by the rules. Do you think options will take any of the heat or help you in any way in case of a violation? HA! Again do nothing illegal for or against the company.
Yea, I used to do this until I realized every time I put on the mask it scared the $hit out of the pax, so now I just put in on my lap at the ready.
also:
I am always amazed at the things I hear from people, and even more so at the people that blindly believe what they are told (so it must be true). Pressiurization systems are one of the more basic systems to understand. A cabin altitude is a cabin altitude and a leak rate is a leak rate. Do you know the leak rate of the aircraft you are flying? If you are holding a cabin altitude of 8000' and you develop a leak rate of 500 fpm (which by the way is not typical, most cabins are in the 1000 to 1500' range as a norm) . It's easy math at this point, I don't care what kind of aircraft you are in.
Nomore, next time you are on an empty repo you should shut off your bleed sources and see what the leak rate is for the aircraft you a flying (FL20's of course). It's good info to know. You might want to also brush up on your o2 charts for those times you have a wet footprint or are over an MSA that does not permit a low enough altitude that you don't need supplemental oxygen (SE drftdown not withstanding)