Fairchild Club Forum

Posted: **Mon Feb 20, 2006 3:49 pm**

'Does anyone have any experience bench testing the Jack & Heinz gyro?
Mine seems locked in the "caged" postion ( little flag up and knob won't
turn) yet application of some suction provides nothing.

Failing this info, how does it work in the plane? Start the engine, the
venturi sucks because of prop wash, then if you shut the engine down
would you hear the gyro spinning down? Thanks.

David Stroud Ottawa, Canada
C-FDWS Christavia
Fairchild 51 early construction

[Non-text portions of this message have been removed]'

Posted: **Tue Feb 21, 2006 11:17 am**

'David,

I have several "Sperry" artifical horizons here, they are probably
similar. To uncage, normally you would need to pull and turn. If
nothing happens it might be corroded. The gyro will turn regardless of
caged or not.

Just to run the engine on the ground will not create enough vacuum to
run the gyro properly. It needs flying speed.

You can connect a vacuum cleaner to the instrument for bench testing.

I hope that helps.

Best regards

Karl

--- In fairchildclub@yahoogroups.com, "david stroud" wrote:
>
> Does anyone have any experience bench testing the Jack & Heinz gyro?
> Mine seems locked in the "caged" postion ( little flag up and knob
won't
> turn) yet application of some suction provides nothing.
>
> Failing this info, how does it work in the plane? Start the engine,
the
> venturi sucks because of prop wash, then if you shut the engine down
> would you hear the gyro spinning down? Thanks.
>
> David Stroud Ottawa, Canada
> C-FDWS Christavia
> Fairchild 51 early construction
>
>
>
> [Non-text portions of this message have been removed]
>

'

Posted: **Tue Feb 21, 2006 6:55 pm**

'Thanks for the note, Karl. The vacuum cleaner trick was good enough to spool
things up and the cage knob gear was temporarily locked up where it enters
the case. The device seems to work ok now on the bench but the "caged"
flag won't go away. I'm thinking it should go away on shutdown?

If I sat in a box for 60 years, I'd be a bit stiff too I guess. The little plastic
plugs on the back were brittle as hell and had to get drilled out.

David Stroud Ottawa, Canada
C-FDWS Christavia
Fairchild 51 early construction

----- Original Message -----
From: Karl Saenger
To: fairchildclub@yahoogroups.com
Sent: Tuesday, February 21, 2006 12:17 PM
Subject: [fairchildclub] Re: Jack & Heinz attitude gyro

David,

I have several "Sperry" artifical horizons here, they are probably
similar. To uncage, normally you would need to pull and turn. If
nothing happens it might be corroded. The gyro will turn regardless of
caged or not.

Just to run the engine on the ground will not create enough vacuum to
run the gyro properly. It needs flying speed.

You can connect a vacuum cleaner to the instrument for bench testing.

I hope that helps.

Best regards

Karl

--- In fairchildclub@yahoogroups.com, "david stroud" wrote:
>
> Does anyone have any experience bench testing the Jack & Heinz gyro?
> Mine seems locked in the "caged" postion ( little flag up and knob
won't
> turn) yet application of some suction provides nothing.
>
> Failing this info, how does it work in the plane? Start the engine,
the
> venturi sucks because of prop wash, then if you shut the engine down
> would you hear the gyro spinning down? Thanks.
>
> David Stroud Ottawa, Canada
> C-FDWS Christavia
> Fairchild 51 early construction
>
>
>
> [Non-text portions of this message have been removed]
>

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Fairchild Jet plane Pedal plane

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'

Posted: **Tue Feb 21, 2006 9:43 pm**

'In a message dated 2/21/2006 7:56:41 P.M. Eastern Standard Time,
dstroud@storm.ca writes:

Thanks for the note, Karl. The vacuum cleaner trick was good enough to spool
things up and the cage knob gear was temporarily locked up where it enters
the case. The device seems to work ok now on the bench but the "caged"
flag won't go away. I'm thinking it should go away on shutdown?

If I sat in a box for 60 years, I'd be a bit stiff too I guess. The little
plastic
plugs on the back were brittle as hell and had to get drilled out.

David Stroud Ottawa, Canada
C-FDWS Christavia
Fairchild 51 early construction

----- Original Message -----
From: Karl Saenger
To: fairchildclub@yahoogroups.com
Sent: Tuesday, February 21, 2006 12:17 PM
Subject: [fairchildclub] Re: Jack & Heinz attitude gyro

David,

I have several "Sperry" artificial horizons here, they are probably
similar. To un cage, normally you would need to pull and turn. If
nothing happens it might be corroded. The gyro will turn regardless of
caged or not.

Just to run the engine on the ground will not create enough vacuum to
run the gyro properly. It needs flying speed.

You can connect a vacuum cleaner to the instrument for bench testing.

I hope that helps.

Best regards

Karl

--- In fairchildclub@yahoogroups.com, "david stroud" wrote:
>
> Does anyone have any experience bench testing the Jack & Heinz gyro?
> Mine seems locked in the "caged" position ( little flag up and knob
won't
> turn) yet application of some suction provides nothing.
>
> Failing this info, how does it work in the plane? Start the engine,
the
> venturi sucks because of prop wash, then if you shut the engine down
> would you hear the gyro spinning down? Thanks.
>
> David Stroud Ottawa, Canada
> C-FDWS Christavia
> Fairchild 51 early construction
>
>
>
> [Non-text portions of this message have been removed]
>

SPONSORED LINKS Private plane Fairchild semiconductor Plane reservation
Fairchild Jet plane Pedal plane

------------------------------------------------------------------------------
YAHOO! GROUPS LINKS

a.. Visit your group "fairchildclub" on the web.

b.. To unsubscribe from this group, send an email to:
fairchildclub-unsubscribe@yahoogroups.com

c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

------------------------------------------------------------------------------

------------------------------------------------------------------------------

No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.375 / Virus Database: 267.15.12/265 - Release Date: 2/20/06

[Non-text portions of this message have been removed]

Yahoo! Groups Links

As I remember the flag is mechanical and will only go away when the knob is
turned. Yes the gyro may turn but the horizon will remain stationary unless
the unit is un caged.

[Non-text portions of this message have been removed]

'