06 Nov 2025, 08:06 [ UTC - 5; DST ]
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Post subject: 441 drooping flaps  Posted: 13 Feb 2022, 13:33 |
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Joined: 08/05/16
Posts: 3151
Post Likes: +2294
Company: Tack Mobile
Location: KBJC
Aircraft: C441
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Our hydraulic flaps are full down after sitting in the hangar for a few days. I assume this is some sort of leak. Any advice?
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Post subject: Re: 441 drooping flaps Posted: 13 Feb 2022, 16:19 |
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Joined: 10/07/18
Posts: 3605
Post Likes: +2577
Company: Retired
Location: Columbus, Ohio
Aircraft: Baron 58, Lear 35
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No experience with a 441, but when a Lear does that, the selector valve is leaking internally.
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Post subject: Re: 441 drooping flaps Posted: 13 Feb 2022, 18:10 |
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Joined: 10/21/21
Posts: 22
Post Likes: +16
Aircraft: C425 C525
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Hydraulic leak in the actuator.
_________________
I have all the planes I need, but not all the planes I want.
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Post subject: Re: 441 drooping flaps Posted: 14 Feb 2022, 20:12 |
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Joined: 08/05/16
Posts: 3151
Post Likes: +2294
Company: Tack Mobile
Location: KBJC
Aircraft: C441
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Our shop (West Star) said it could be the bypass valve or the actuator. The bypass is supposed to open at 400 psi, if it is opening lower then the weight of the flaps will cause the fluid to bypass.
Also could be a flap control valve which he said was expensive.
Sounds like some trial and error in our future.
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Post subject: Re: 441 drooping flaps Posted: 14 Feb 2022, 20:24 |
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Joined: 08/24/13
Posts: 10152
Post Likes: +4836
Company: Aviation Tools / CCX
Location: KSMQ New Jersey
Aircraft: TBM700C2
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Username Protected wrote: Our shop (West Star) said it could be the bypass valve or the actuator. The bypass is supposed to open at 400 psi, if it is opening lower then the weight of the flaps will cause the fluid to bypass.
Also could be a flap control valve which he said was expensive.
Sounds like some trial and error in our future. I wonder if a stethoscope on the valves or actuator would help confirm which part it is
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Post subject: Re: 441 drooping flaps Posted: 14 Feb 2022, 20:30 |
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Joined: 08/05/16
Posts: 3151
Post Likes: +2294
Company: Tack Mobile
Location: KBJC
Aircraft: C441
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Username Protected wrote: Our shop (West Star) said it could be the bypass valve or the actuator. The bypass is supposed to open at 400 psi, if it is opening lower then the weight of the flaps will cause the fluid to bypass.
Also could be a flap control valve which he said was expensive.
Sounds like some trial and error in our future. I wonder if a stethoscope on the valves or actuator would help confirm which part it is
That there is a good idea! I will mention that to the shop and report back.
I dropped her off for paint at Murmer Aircraft this morning so this'll have to wait until they are done.
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Post subject: Re: 441 drooping flaps Posted: 14 Feb 2022, 20:37 |
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Joined: 10/07/18
Posts: 3605
Post Likes: +2577
Company: Retired
Location: Columbus, Ohio
Aircraft: Baron 58, Lear 35
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From what I’ve read, the bypass valve is normally open and is powered closed when flap movement is selected. That would mean it is open sitting in the hangar and is not the source of your problem. I would cap both fittings on the actuator. If it still does it, the problem is the actuator. The diagram I was looking at also shows a relief valve which allows fluid to return to the reservoir from the retract side of the actuator, without having to go through the control valve. That’s another possibility.
Edit: After re-reading your post I think what is called the relief valve in the diagram is what you are referring to as the by-pass valve.
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