PPRuNe Forums - View Single Post - A320 STRANGE PTU behaviour
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Old 25th Jan 2013, 03:09
  #18 (permalink)  
EIU_EEC
 
Join Date: Jan 2013
Location: usa
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In addition to giving you a hard time (while in one case referring to you patronisingly as "buddy"), several posters seem to have missed the original point of your thread completely. (Wasn't it ever thus? )
Chris, thank you!
In summary, till now the reason for the "glitch" hasn't been understood. ptu self test for 2 minutes...and that too in the air in the LVO ops..
This is from the MEL if it helps in getting some clues.

Note: 1. The PTU pressurizes the system to a nominal value of 3 000 PSI PSI (± 200 PSI),
but if no consumers are operated the pressure is not constant. The PTU operates in
a cycle which keeps the pressure in the hydraulic systems between 2 100 PSI and
3 200 PSI.
2. For passengers comfort, the PTU may be set to OFF during the taxi after landing
provided that both engines hydraulic pumps are operative and running. The PTU must
be set back to AUTO before leaving the aircraft.
Can this lead to the PTU servo valves in an endless loop?

The fact is THIS very occurrence is being dismissed as harmless glitch, already in 2 different cases is very disturbing. In aviation NOTHING can be dismissed as unimportant till we get hold of the root cause.History shows this very attitude of us pilots of thinking we know everything and nothing can happen to us has led to the deaths of thousands of innocent lives, who have no idea of whether its a PTU or a dog loose in the Aft cargo barking away!
So guys instead of criticizing everyone's small errors, please behave constructively and seek help from maintenance ASAP!

Last edited by EIU_EEC; 25th Jan 2013 at 03:22.
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