Transponder problem...

Had a strange one today..

While squawking IDENT , our "ident" stuck "on"

ATC confirmed we were continuously "identing"

Cycling the transponder to off then on again cleared the
ident fault.

Pressing the button again locks the ident light on again
until the power is cycled..

Any thoughts?

Switch appears mechanically OK, (clicks when pressed, clicks
when released)..

It is a King KT78 "KT76TSO"

Dave

Take it to an avionics shop, it isn't airworthy until you
fix it.




--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm



"Dave" wrote in message
...
| Had a strange one today..
|
| While squawking IDENT , our "ident" stuck "on"
|
| ATC confirmed we were continuously "identing"
|
| Cycling the transponder to off then on again cleared the
| ident fault.
|
| Pressing the button again locks the ident light on again
| until the power is cycled..
|
| Any thoughts?
|
| Switch appears mechanically OK, (clicks when pressed,
clicks
| when released)..
|
| It is a King KT78 "KT76TSO"
|
| Dave

On Sun, 13 Nov 2005 20:12:43 -0600, "Jim Macklin"
wrote in
4qSdf.1063$QW2.860@dukeread08::

James H. Macklin
ATP,CFI,A&P

Welcome back to rec.aviation.piloting.

Has it been almost five years?

Since 9/11 when I lost the cable Internet. Glad you
remember me. Just renewed my CFI for another cycle, good
until Jan 2008. I plan to win the lottery before Christmas
and buy myself a Legacy Cub. Maybe I'll put half a Garmin
1000 in it



--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm



"Larry Dighera" wrote in message
...
| On Sun, 13 Nov 2005 20:12:43 -0600, "Jim Macklin"
| wrote in
| 4qSdf.1063$QW2.860@dukeread08::
|
| James H. Macklin
| ATP,CFI,A&P
|
| Welcome back to rec.aviation.piloting.
|
| Has it been almost five years?
|

Already gone!

Dave


On Sun, 13 Nov 2005 20:12:43 -0600, "Jim Macklin"
wrote:

Take it to an avionics shop, it isn't airworthy until you
fix it.




--
James H. Macklin
ATP,CFI,A&P

On it's way back, should have it tomorrow....

Including taxes, .219 AMU's.. (CDN $"s)

Suprisingly, they could not reproduce the fault on the bench, so they
replaced the IC, some caps etc, all the parts in the timing circuit,
($35 in parts).. They did a full alignment, centered it to fac specs,
and are sending it home..

I am dissappointed the fault cleared on the bench, that still leaves
some doubt, but they heated it, froze it several times, then did what
they could.

How long should this timer cycle for? (How long should the "ident"
signal tx on one push of the switch?)

Dave



On Mon, 14 Nov 2005 18:21:05 -0400, Dave
wrote:

Already gone!

Dave


On Sun, 13 Nov 2005 20:12:43 -0600, "Jim Macklin"
wrote:

Take it to an avionics shop, it isn't airworthy until you
fix it.




--
James H. Macklin
ATP,CFI,A&P

20-30 seconds

"Dave" wrote in message
...
On it's way back, should have it tomorrow....

Including taxes, .219 AMU's.. (CDN $"s)

Suprisingly, they could not reproduce the fault on the bench, so they
replaced the IC, some caps etc, all the parts in the timing circuit,
($35 in parts).. They did a full alignment, centered it to fac specs,
and are sending it home..

I am dissappointed the fault cleared on the bench, that still leaves
some doubt, but they heated it, froze it several times, then did what
they could.

How long should this timer cycle for? (How long should the "ident"
signal tx on one push of the switch?)

Dave



On Mon, 14 Nov 2005 18:21:05 -0400, Dave
wrote:

Already gone!

Dave


On Sun, 13 Nov 2005 20:12:43 -0600, "Jim Macklin"
wrote:

Take it to an avionics shop, it isn't airworthy until you
fix it.




--
James H. Macklin
ATP,CFI,A&P

Hmmm... that seems like a long time... tech said mine is suposed to
be set for 15 secs, and I thought that was very long time.

Can anyone direct me to a resource that explains how the "ident" sys
works? - what happens when the button is pushed, to how it appears
on the controllers radar..

I understant WHAT happens in basic fashon, I need some more details.

I have a background in electronics, so I understand the technology,
but never any training on avionics..

Thanks !

Dave

On Thu, 17 Nov 2005 01:10:44 GMT, "Michael Ware"
wrote:

20-30 seconds

"Dave" wrote in message
.. .
On it's way back, should have it tomorrow....

Including taxes, .219 AMU's.. (CDN $"s)

Suprisingly, they could not reproduce the fault on the bench, so they
replaced the IC, some caps etc, all the parts in the timing circuit,
($35 in parts).. They did a full alignment, centered it to fac specs,
and are sending it home..

I am dissappointed the fault cleared on the bench, that still leaves
some doubt, but they heated it, froze it several times, then did what
they could.

How long should this timer cycle for? (How long should the "ident"
signal tx on one push of the switch?)

Dave



On Mon, 14 Nov 2005 18:21:05 -0400, Dave
wrote:

Already gone!

Dave


On Sun, 13 Nov 2005 20:12:43 -0600, "Jim Macklin"
wrote:

Take it to an avionics shop, it isn't airworthy until you
fix it.




--
James H. Macklin
ATP,CFI,A&P