PAF_Herc Posted April 9, 2018 Share Posted April 9, 2018 Hello all herc operators / maintainers! Can someone kindly advice on the reason why the aircraft has a flight deck refrigeration shut off valve manual override handle (nav station). What purpose does it serve. Why only for the flight deck air conditioning flow regulator. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
Steve1300 Posted July 10, 2018 Share Posted July 10, 2018 Well, someone at one time seemed to think that loss of air-conditioning in the flight deck was a grounding item. If the flight deck flow control valve doesn't open normally, it can be pulled open. If it can't be shutoff normally, it can be shutoff manually. However, mid 70's, someone thought that it was not necessary and they took that part of the system out. I have never seen it intentionally used, but it has been unintentionally shut off many times. Interestingly, the temp control boxes will still drive the temperature system to cool with the master switch off if the system keeps running and there is an overheat in the ducting. I can only guess that the designers thought that someone would manually turn the system on? Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted August 24, 2018 Share Posted August 24, 2018 (edited) If flow control shut off stuck i in close position, it can be manually opened to comfort the crew member Regards munir abbasi Edited August 24, 2018 by munirabbasi Quote Link to comment Share on other sites More sharing options...
bbuech Posted August 30, 2018 Share Posted August 30, 2018 Manual Override Control. The flow control and shutoff valve contains a manual override feature. It allows continued operation of the 30 pounds per minute schedule or shutoff schedule in case the solenoid malfunctions. 1 Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted September 1, 2018 Share Posted September 1, 2018 (edited) When Air Conditioning MAster SW is selected to AUTO PRESS position Solenoids are bypassed Regards Munir abbasi Home of hercules in pakistan Edited September 1, 2018 by munirabbasi Quote Link to comment Share on other sites More sharing options...
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