Hydraulic Flaps Question

[MIR2018]

I’m looking at a 1964-C model that I’m considering purchasing (my first airplane).... the current owner explained (as he demonstrated to me) that you have to pump the handle until you feel resistance and then 4 times will be full flaps... is that normal to have to pump up some pressure before the flaps start to move? 

[N6018Q]

I don’t know if it’s normal or not but I generally start getting resistance in my E on the second pump.

[Skates97]

Nope, they should start moving with the first pump. About 4 1/4 pumps should be full flaps.

[flight2000]

3 minutes ago, Skates97 said:

Nope, they should start moving with the first pump. About 4 1/4 pumps should be full flaps.

That was the same experience with my M20E.

Brian

[N201MKTurbo]

They need to be bled. Not terribly expensive. The flap pump may have some hard o-rings letting air into the system. Shouldn’t be an expensive repair for someone who knows what they are doing.

[Guest tommy123]

Low fluid, a leak or bad o rings. Should move immediately. 41/2 pumps should be full flaps. 

[RLCarter]

Agree with the others, very simple system, not that much to rebuild if it comes to that but more than likely just need bled 

[MBDiagMan]

They are low on fluid.  They need to be checked for leaks, leaks repaired, filled  and then bled.

[Bob_Belville]

12 hours ago, MIR2018 said:

I’m looking at a 1964-C model that I’m considering purchasing (my first airplane).... the current owner explained (as he demonstrated to me) that you have to pump the handle until you feel resistance and then 4 times will be full flaps... is that normal to have to pump up some pressure before the flaps start to move? 

The hydraulic system which operates the flaps also powers the toe brakes. I wonder if the brakes on that M20C also need to be "primed". The owner ought to be able to tell you whether he keeps the (single) reservoir full. 

Do you plan to have a PPI done? If so I'd recommend @AGL Aviation very near you. KMRN. 

[AGL Aviation]

If the system is working correctly, you should get immediate response pumping the handle. Lynn said it sounds like there is air trapped in the system somewhere.


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[DXB]

Either it's low on fluid or needs to be bled.  Top off hydraulic reservoir.  Easier than formally bleeding is pumping the handle like a million times without the switch in the up position.  Guarantee the air will work its way out eventually, but it takes a ton of pumping.  

Also check for leaks - I've got a few small ones in the system that I've never fully resolved, so I add 30cc fluid to top off at every oil change.

 

[MIR2018]

5 hours ago, Bob_Belville said:

The hydraulic system which operates the flaps also powers the toe brakes. I wonder if the brakes on that M20C also need to be "primed". The owner ought to be able to tell you whether he keeps the (single) reservoir full. 

Do you plan to have a PPI done? If so I'd recommend @AGL Aviation very near you. KMRN. 

Thanks... The airplane will be going to the MSC at KDNN.  But since the airplane is going into annual this week, wouldn't they take care of it, or at least write it up as a discrepancy?

[MIR2018]

4 hours ago, DXB said:

 like a million times without the switch in the up position. 

the switch should be in the down position to do this? Or did you mean to say "with the switch in the up position"

[MIR2018]

ANOTHER QUESTION:

     This airplane has what is labeled "field" (embossing taped)  and according to the owner, the battery doesn't charge unless this switch is on... What might that be about?

[N201MKTurbo]

5 minutes ago, MIR2018 said:

ANOTHER QUESTION:

     This airplane has what is labeled "field" (embossing taped)  and according to the owner, the battery doesn't charge unless this switch is on... What might that be about?

It would be a switch to turn the voltage regulator on/off. Is it a circuit breaker switch?

[N201MKTurbo]

8 minutes ago, MIR2018 said:

ANOTHER QUESTION:

     This airplane has what is labeled "field" (embossing taped)  and according to the owner, the battery doesn't charge unless this switch is on... What might that be about?

You see them on twins so you can check the individual alternators. You don’t see them on singles very often.

[RLCarter]

1 minute ago, N201MKTurbo said:

You see them on twins so you can check the individual alternators. You don’t see them on singles very often.

When I did the plane power alternator conversation, they spec'd a "Field" switch , so mine has one too..... Nice bright yellow light to remind you after start-up

[MIR2018]

3 hours ago, N201MKTurbo said:

It would be a switch to turn the voltage regulator on/off. Is it a circuit breaker switch?

Well not sure if it also has a breaker function, but it is a flip type switch.

[MIR2018]

3 hours ago, RLCarter said:

When I did the plane power alternator conversation, they spec'd a "Field" switch , so mine has one too..... Nice bright yellow light to remind you after start-up

Well, no bright yellow lite.  Guess I’ll have a bold action on my checklist until I can have a lite installed... ( If it passes PPI)

[RLCarter]

3 hours ago, MIR2018 said:

Well, no bright yellow lite.  Guess I’ll have a bold action on my checklist until I can have a lite installed... ( If it passes PPI)

My buddy's C doesn't have the light either, the AMP gauge will let ya know as well

[Hector]

My plane power conversion came with a yellow light too.


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[eman1200]

how does it work? (the field switch, not the hydraulic flaps lol)

[RLCarter]

Switch cuts the power to the field coil in the alternator, supposedly to eliminate any voltage spikes to the avionics     

 

[Jim Peace]

I own a 64c. My flaps move on the first pump.  This system although simple requires an old school mechanic that is a craftsman. Hard to find these days. It takes reading the manual and not losing any parts if it is taken apart. Good luck finding that guy. I got lucky when I had a issue with the system that my plane just happened to be at Van Nuys. 

Most mechanics these days take shit apart without reading,  it was done to me by a MSC up north  destroyed my carb heat,  cost me a lot to take someplace else for repair  

 

 

 

[Bob_Belville]

16 hours ago, MIR2018 said:

Thanks... The airplane will be going to the MSC at KDNN.  But since the airplane is going into annual this week, wouldn't they take care of it, or at least write it up as a discrepancy?

That would be Cole. And yes they should catch it and service as necessary but it would not hurt to point it out to Joey assuming you have input. If Joey is working for the seller you might want to be sure that he brings it up.