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B727Learn
Topic Author
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Joined: Tue Oct 02, 2018 12:40 pm

B737NG Cockpit Oxygen Masks

Tue Oct 02, 2018 12:46 pm

Hi Everyone,

1) Anyone knows the flow rate of the O2 mask for the B737NG as per different mask settings and ambient pressure?
2) How much time is the minimum dispatch amount suppose to provide you?
Thank you in advance.

Regards
B727Learn
Last edited by atcsundevil on Wed Oct 03, 2018 3:38 am, edited 1 time in total.
Reason: Title edited for clarity
 
BravoOne
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Re: B737NG Oxygen

Tue Oct 02, 2018 8:10 pm

Are ypu talking about crew O2 or Pax O2 generators which of course only have one setting?
 
B727Learn
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Re: B737NG Oxygen

Wed Oct 03, 2018 3:28 am

Hi, sorry, yes flight crew masks... Thanks.
 
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Starlionblue
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Re: B737NG Cockpit Oxygen Masks

Wed Oct 03, 2018 3:45 am

I thought it was 2 hours regardless of type. But I could be wrong.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
B727Learn
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Re: B737NG Cockpit Oxygen Masks

Thu Oct 04, 2018 3:48 am

Starlionblue wrote:
I thought it was 2 hours regardless of type. But I could be wrong.


Based on the minimum dispatch amount??
 
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Starlionblue
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Re: B737NG Cockpit Oxygen Masks

Thu Oct 04, 2018 3:55 am

B727Learn wrote:
Starlionblue wrote:
I thought it was 2 hours regardless of type. But I could be wrong.


Based on the minimum dispatch amount??


When I wrote my reply I only remembered the number. But it is based on regulations. Minimum dispatch is a pressure value because that's the figure we have, and that pressure must give us 2 hours. Some routes require higher pressure than others, presumably because they have additional crew members and/or fly over high terrain that will preclude an immediate descent to 10000 feet.

14 CFR 121.333 - Supplemental oxygen for emergency descent and for first aid; turbine engine powered airplanes with pressurized cabins.

...

(b)Crewmembers. When operating at flight altitudes above 10,000 feet, the certificate holder shall supply enough oxygen to comply with § 121.329, but not less than a two-hour supply for each flight crewmember on flight deck duty. The required two hours supply is that quantity of oxygen necessary for a constant rate of descent from the airplane's maximum certificated operating altitude to 10,000 feet in ten minutes and followed by 110 minutes at 10,000 feet. The oxygen required in the event of cabin pressurization failure by § 121.337 may be included in determining the supply required for flight crewmembers on flight deck duty.


https://www.law.cornell.edu/cfr/text/14/121.333
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
Lpbri
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Re: B737NG Cockpit Oxygen Masks

Thu Oct 04, 2018 12:19 pm

Minimum flight crew oxygen pressure for dispatch on a 737NG non-etops is 450-500 psi for 2 occupants. 640-700 psi for 3 occupants. Im seeing 830-900 for 4. Not sure how you get 4 people into a 737 flightdeck.
 
barney captain
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Re: B737NG Cockpit Oxygen Masks

Thu Oct 04, 2018 1:20 pm

Lpbri wrote:
Not sure how you get 4 people into a 737 flightdeck.


Two cockpit seats and two jumpseats. It happens every day - and yes, it sucks.
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DL777200LR
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Re: B737NG Cockpit Oxygen Masks

Sat Oct 06, 2018 8:01 am

barney captain wrote:
Lpbri wrote:
Not sure how you get 4 people into a 737 flightdeck.


Two cockpit seats and two jumpseats. It happens every day - and yes, it sucks.


Doesn’t 1 jumpseat take the space at the door? Where is the 2 jumpseat located??
Nothing better than the sound of a 77W GE90-115B on engine start.
 
Lpbri
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Re: B737NG Cockpit Oxygen Masks

Sat Oct 06, 2018 1:44 pm

To the right is a luggage rack. Someone figured out you could put a seat there. The FAA actually approved it. There is a provision for an O2 mask there. I've never seen it, but you can put 4 people in a Volkswagon
 
barney captain
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Re: B737NG Cockpit Oxygen Masks

Sat Oct 06, 2018 4:00 pm

DL777200LR wrote:
barney captain wrote:
Lpbri wrote:
Not sure how you get 4 people into a 737 flightdeck.


Two cockpit seats and two jumpseats. It happens every day - and yes, it sucks.


Doesn’t 1 jumpseat take the space at the door? Where is the 2 jumpseat located??



Image
Southeast Of Disorder
 
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7BOEING7
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Re: B737NG Cockpit Oxygen Masks

Sat Oct 06, 2018 6:26 pm

barney captain wrote:
DL777200LR wrote:
barney captain wrote:

Two cockpit seats and two jumpseats. It happens every day - and yes, it sucks.


Doesn’t 1 jumpseat take the space at the door? Where is the 2 jumpseat located??



Image


The photo makes it look like there's more room than there really is -- if the captain is tall you better not bring your legs if you want to sit there.
 
JAGflyer
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Re: B737NG Cockpit Oxygen Masks

Mon Oct 08, 2018 8:52 pm

My airline has deleted the #2 jumpseat (behind the captain) on the 737NGs so there is no seatbelt/padding. The one that folds down however is used periodically and I have flown numerous 4+ hour flights in it with no issue. I am 5"9 and 140lbs though so that may help. It's possible to stand up and stretch easily.
If you flew today, thank a Flight Dispatcher!
 
barney captain
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Re: B737NG Cockpit Oxygen Masks

Tue Oct 09, 2018 12:13 am

7BOEING7 wrote:
barney captain wrote:
DL777200LR wrote:

Doesn’t 1 jumpseat take the space at the door? Where is the 2 jumpseat located??


The photo makes it look like there's more room than there really is -- if the captain is tall you better not bring your legs if you want to sit there.


Absolutely. Even an average sized Capt will leave just a few inches between seat back and the JS - causing you to straddle the seat on either side.

Awesome.
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