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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)
 
Cool Hand:
Just a thought. You said you put the O2 mask on your lap above 350. Well, if you had a rapid decompression, where would that mask go? If you are not going to wear it then the next best place it seems to me would be where it was stowed. At least you could reach there knowing it would be there and not flying around someplace else.
 
Think about this too, a long time pilot at FLOPs developed a serious lung infection from following the rules and lost his medical. Initials TR. From what I heard he is being raped by the company for not being able to fly the line. (as if that is his fault.)

How often do you think the company sanitizes/sterilizes those bottles each year? How rigorously do you think they track and monitor the sources of O2 that they have put into those bottles? I bet you are filled by O2 bottles off the back of some truck from some unknown outsourced mx more times than you receive O2 from a service center or actual FLOPs mx center.
 
Cool Hand:
Just a thought. You said you put the O2 mask on your lap above 350. Well, if you had a rapid decompression, where would that mask go? If you are not going to wear it then the next best place it seems to me would be where it was stowed. At least you could reach there knowing it would be there and not flying around someplace else.

Yea, I've thought about that. It's not like anyone will be able to see anything at that point. Advice taken. Thanks.
 
...every time I put on the mask it scared the $hit out of the pax,
Another consideration is the knowledge level of the pax. Many NetJets owners are current/former pilots themselves. Several owners are type rated in the aircraft we fly and attend FSI recurrent with our line pilots. Some of them are very aware of the regs. If you are plodding along at FL450 with the masks stowed, they will notice.
 
Another consideration is the knowledge level of the pax. Many NetJets owners are current/former pilots themselves. Several owners are type rated in the aircraft we fly and attend FSI recurrent with our line pilots. Some of them are very aware of the regs. If you are plodding along at FL450 with the masks stowed, they will notice.

I often fly engineers, I think I'd like to trade you for those owner/pilots. LOL. There's nothing better than trying to explain the three separate and independent flaps systems of a Brasilia to an engineer. Good times!
 
How many operators actually comply with the o2 reg above 350? We don't, but our DO mentioned putting it in our procedures ugh. I guess it depends on the individual and the FSDO/POI also.
 

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