valve remains open after A320 eng. Start?
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Overboard exh Valve.
Pack Valve.
Outflow Valve.
Engine handling Valve.
Isolation Valve, to mention a few !
Poster mentions "not the usual" or similar.
After engine shut down, Valve remains open ? a nice question, but nobody apart from me knows watt valve i'm talking about !!!
Pack Valve.
Outflow Valve.
Engine handling Valve.
Isolation Valve, to mention a few !
Poster mentions "not the usual" or similar.
After engine shut down, Valve remains open ? a nice question, but nobody apart from me knows watt valve i'm talking about !!!
Question was valve remains open, question does not mention watt valve, 320 has many many valves ???
Is it a steam valve or electrical?
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oh, my god, it's the engine start valve, the one indicated on the bottom of your screen during start up. It's the one you can open manualy for manual engine start.
look in the FCOM under failure " start valve locked in open position"
warning: you may have this failure during a sim check...
look in the FCOM under failure " start valve locked in open position"
warning: you may have this failure during a sim check...
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Handling Valves tend to look after the air flowing through the engines, from memory, they tend to be open during engine start and shut as the engine rpm increases, some remain open at idle and shut as the engine rpm increases, some can open if reqd, like surge/stall/rev in use.
Will have to wait for the poster to advise which Valve ???
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V2500 Engine Accsessories
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Woodward: Specialty Valves
.
Will have to wait for the poster to advise which Valve ???
.
V2500 Engine Accsessories
.
Woodward: Specialty Valves
.
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joetom, If the initial question was not relating to the Start Valve, you might be right.
The engine handling valves you describe must be the valves for the air bleed system for compressor stability on the V2500 (stages 2.5 of LPC and 7, 10), they improve the stall margin on engine start and low power operation. The failsafe position for the above mentioned valves is open.
So if they fail open they have no adverse effect on engine operation.
The engine handling valves you describe must be the valves for the air bleed system for compressor stability on the V2500 (stages 2.5 of LPC and 7, 10), they improve the stall margin on engine start and low power operation. The failsafe position for the above mentioned valves is open.
So if they fail open they have no adverse effect on engine operation.
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If handling valve/valves fail open, engine will not be performing to book figures, fuel/RPM/EGT will tend to increase, picked up people operating engine or recording systems.
From memory, if the VBVs fail open on the CFM56, engine will be very unhappy to provide Hi power.
From memory, if the VBVs fail open on the CFM56, engine will be very unhappy to provide Hi power.
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Agree,
engine performance will certainly not be optimum, FCOM 1 also has reference to increased fuel consumption for the V2500, although it is for the active clearance control.
Now lets see what the gentlemen who posted the question actually meant!
engine performance will certainly not be optimum, FCOM 1 also has reference to increased fuel consumption for the V2500, although it is for the active clearance control.
Now lets see what the gentlemen who posted the question actually meant!
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I think he's talking about the Overboard Exh Valve.
Again from memory, Engineer can switch off power at Valve location, then he/she will operate manual handle/winder on Valve, Valve will shut and then a little door in Valve face opens to allow some air flow, power switch to remain off, MEL should have the details.
Again from memory, Engineer can switch off power at Valve location, then he/she will operate manual handle/winder on Valve, Valve will shut and then a little door in Valve face opens to allow some air flow, power switch to remain off, MEL should have the details.
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Take Off Power,
Reminds me of an old story about Capt asking for TOP just before landing, Capt wanted idle, FEO applied Max power, just as well because aircraft encountered strange wind or windshear or similar, they were very lucky that day, think it was many many years ago, poss 4 prop aircraft, will google it now you mention.
Can't remember OBE Valve ind on 320 flt deck, may be SD page or switch overhead, may be nothink, ECAM will Hi-lite prob i would guess.
Reminds me of an old story about Capt asking for TOP just before landing, Capt wanted idle, FEO applied Max power, just as well because aircraft encountered strange wind or windshear or similar, they were very lucky that day, think it was many many years ago, poss 4 prop aircraft, will google it now you mention.
Can't remember OBE Valve ind on 320 flt deck, may be SD page or switch overhead, may be nothink, ECAM will Hi-lite prob i would guess.
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From memory, if the VBVs fail open on the CFM56, engine will be very unhappy to provide Hi power
overboard exhaust valve not installed on 320, this valve is called "skin air outlet valve", indication on ecam sd "press" page, position is independent on eng. runnig or not