Y apu IN ETOPS ??
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Perhaps I'm missing something here. A RAT is only needed in the event ALL engines stop turning - ETOPS or not.
So requiring the APU because you don't have a RAT does not make sense. Because RAT or APU, you will be coming down.
60 minutes, 120 minutes, 200 minutes ETOPS - if both engines have stopped all the RAT will do is control the descent...
So requiring the APU because you don't have a RAT does not make sense. Because RAT or APU, you will be coming down.
60 minutes, 120 minutes, 200 minutes ETOPS - if both engines have stopped all the RAT will do is control the descent...
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APU - provides full electrics if youve lost all/partial primary AC
sources (wether one eng out or not).
RAT - provides extremley limited AC electrics (and limited hyd on
some types) if you lose both gennys because of all engines out or
all primary AC sources out with all or partial engines running.
sources (wether one eng out or not).
RAT - provides extremley limited AC electrics (and limited hyd on
some types) if you lose both gennys because of all engines out or
all primary AC sources out with all or partial engines running.
Last edited by Slasher; 31st Oct 2010 at 03:44.
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Oh dear! Why are we talking about 757/767/AB etc?????
Here is the question:
"Why Do We Start Apu In Etops Flight ??? {boeing 737 Ng }
#4 is the answer. Does the 737nG have a RAT?
No
That's all!
Here is the question:
"Why Do We Start Apu In Etops Flight ??? {boeing 737 Ng }
#4 is the answer. Does the 737nG have a RAT?
No
That's all!
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You don't only need a RAT or an APU because both engines have failed; RAT and/or APU both supply electrical power if you lose all generators (Backup- or Engine Driven).
The RAT will also supply hydraulic pressure on the 777 at all altitudes (on the 737NG, the APU will also supply hydraulic pressure at least indirectly via the electric hydraulic pumps.
The RAT will also supply hydraulic pressure on the 777 at all altitudes (on the 737NG, the APU will also supply hydraulic pressure at least indirectly via the electric hydraulic pumps.
