Pressurisation non normal sequence of events NG
Hi
Please can you advise the sequence of events in the event of a dual engine failure and a complete loss of electrics. (Before APU start or APU U/s) Apart from the manual controller which is on The battery bus everything else is on AC. Kind regards Pin |
I didn't know the 737 was known for double engine failures. I'd guess, the manual controller would try to close the outflow valves while the pilots did the heavy lifting of STARTING THE APU, followed by starting an engine or two. Far more important than the pressuriation problem.
GF |
Wells there's a NNC for losing your two power plants so it is possible.
Yes. I know about priorities.mbut just want to know ! |
I'd guess, the manual controller would try to close the outflow valves while the pilots did the heavy lifting of STARTING THE APU, |
Apart from the manual controller which is on The battery bus everything else is on AC. |
Simply select MANUAL and use the OPEN/CLOSE switch to control the outflow valve!
EW73 |
Isn't this covered in any of your sim cycles?
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With no bleed air, how much difference is it really going to make?
I would focus on other more pressing matters. |
With no bleed air, how much difference is it really going to make? Anyway, one thing at a time. Let the warnings and cautions dictate your actions as they arrive. |
It would be interesting to find out how much bleed air a windmilling engine produces. If it is producing enough pressure to open the required valves, then closing the outflow valve more should assist in maintaining cabin pressure. Throw the O2 on get the plane safe. Let the back have a little hypoxic-induced sleep whilst ya fly her down (I suspect it'll be coming down pretty good on it's own with a simultaneous dual engine failure). |
Maybe the windmilling engines could also produce enough thrust to maintain altitude.
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No need to be sarcastic.
It was a question, not a response. What are N1/N2 values in a controlled descent? |
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