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#110071 - 01/14/13 08:22 AM Coiled cord from push to talk on yoke
darrel Offline
Safety Pilot

Registered: 08/23/11
Posts: 30
Loc: PA
I have a simple yoke mounted push to talk with a coiled cord enclosing 2 wires from the yoke to the instument panel. The cord is old and needs replacing. Where do I find a replacement? Thanks, Darrel
_________________________
Darrel Robinson

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#110074 - 01/14/13 08:54 AM Re: Coiled cord from push to talk on yoke [Re: darrel]
Propduster Offline
Gold Pilot

Registered: 08/30/10
Posts: 1047
Loc: Nova Scotia, Canada
You might be better off just grabbing a new PTT switch. They aren't that expensive and the frustration factor is likely to make replacing the entire unit a bargain.
_________________________
1963 Cessna 172D C-FPEC

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#110086 - 01/14/13 10:55 AM Re: Coiled cord from push to talk on yoke [Re: Propduster]
SimonT Offline
Safety Pilot

Registered: 05/04/12
Posts: 82
Loc: Farnborough, UK
I agree with propduster. By the time you have soldered the connections to the switch and re wired it you would be better off replacing the switch. Aircraft Spruce do them I believe.

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#110208 - 01/15/13 12:57 AM Re: Coiled cord from push to talk on yoke [Re: SimonT]
Nightowl Offline
Club Sponsor/Speed Demon
Gold Pilot

Registered: 02/14/10
Posts: 1826
Loc: Northwest lower Michigan
I leave such matters to my trusted good friend and avionics guy, who has proven quite often to be the expert in such areas.

John
_________________________
CP-ASEL-IA
'77 C172N, AirPlains 180 hp conversion

Our sigmap has been flown entirely using aircraft with capabilities at or below those of the C-172.


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#110214 - 01/15/13 06:56 AM Re: Coiled cord from push to talk on yoke [Re: Nightowl]
vettdvr Offline
Club Sponsor
Platinum Pilot

Registered: 06/24/10
Posts: 4837
Loc: Slidell La
I had the same problem but the wire insulation had cracked just below the clamp on the yoke. If I remember correctly the panel has to be pulled to reach the connections behind the panel.
_________________________
Vettdvr

Single/Multi/instrument/type/commercial But then I am still learning.

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#110412 - 01/15/13 09:28 PM Re: Coiled cord from push to talk on yoke [Re: vettdvr]
Bush Pilot Offline
Safety Pilot

Registered: 08/03/10
Posts: 50
Loc: Arizona, Alaska, Various Place...
A good A&P or avionics shop should be able to set you up with something like this:

The cord was made from two lengths of mil-spec tefzel wire - think it was AWG 24, may have been 22(was sized appropriately) -inserted into some small white heat shrink, carefully wrapped around a phillips screwdriver, shrunk with a heat gun, and, presto, instant coil cord. Push-to-talk switches are same as the ones that can be purchased from Aircraft Spruce($15.95 SUB-MINIATURE PUSH BUTTON SWITCH
Part # 11-03909)and other places. Most excellent set up.
(Two instruments not installed on the left side of panel were sent out for o/h.)
Tom
_________________________
You Have To Be Alive To Spend It

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#110415 - 01/15/13 10:07 PM Re: Coiled cord from push to talk on yoke [Re: darrel]
Mark Y. Offline
Pilot in Command

Registered: 02/21/11
Posts: 261
Loc: Mundare, Alberta, Canada
Check out the aviation avionics section at your local walmart. Buy the black phone coiled cord for the headset, cut and strip, solder and shrink sleeve. Its a bit of a pain to solder the connections behind the dash, but not bad when you pull the seats. The rotten white stuff I replaced in mine was just phone headset cord that was installed many years ago by a large maintenance facility that specializes in jets that did all the flight school aircraft maintenance that my plane came from.

So in a nutshell, there is not some special mil spec, gold plated coiled cord needed here. Plane old phone cord more than qualifies.

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#110416 - 01/15/13 10:14 PM Re: Coiled cord from push to talk on yoke [Re: Mark Y.]
Bush Pilot Offline
Safety Pilot

Registered: 08/03/10
Posts: 50
Loc: Arizona, Alaska, Various Place...
Yes, right up until a Barney Fife inspector does a ramp check...
tefzel isn't expensive - just a few cents per foot.


Edited by Bush Pilot (01/15/13 10:15 PM)
_________________________
You Have To Be Alive To Spend It

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#110421 - 01/15/13 10:56 PM Re: Coiled cord from push to talk on yoke [Re: Bush Pilot]
Mark Y. Offline
Pilot in Command

Registered: 02/21/11
Posts: 261
Loc: Mundare, Alberta, Canada
Why would an inspector cut open your coiled push to talk cables to inspect the type of wires within? Unless someone was stupid enough to write a log book entry saying they used phone cord from walmart.

A mechanic doing this task would log an entry such as "Unserviceable push to talk cable replaced with serviceable cable, tested - ok"

Nothing wrong with the way you did yours, but coiled wires made from shrinking shrink sleeve over a screwdriver would draw way more attention than a "factory oem" looking coiled cable.


I would not even bother with a log entry for such a menial task as this. I would consider this task difficulty in line with refinishing your instrument panels. Oh ya where is the faa flammability testing reports for that tremclad.... Lol


Edited by bkrfrmhell (01/15/13 10:57 PM)

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#110424 - 01/15/13 11:15 PM Re: Coiled cord from push to talk on yoke [Re: Mark Y.]
cadcap Offline
Bronze Pilot

Registered: 11/17/11
Posts: 563
Loc: NW Indiana
I used coiled cord from a discarded aviation mic...didn't look any different than phone cord !!!!!!
_________________________
"Quality and Progress are Inseperable" Charles Lindbergh 1948

1966 172H Skyhawk N3832R
"Outstanding 172" AirVenture 2012
"Bronze Lindy" AirVenture 2013

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#110427 - 01/16/13 12:04 AM Re: Coiled cord from push to talk on yoke [Re: cadcap]
Bush Pilot Offline
Safety Pilot

Registered: 08/03/10
Posts: 50
Loc: Arizona, Alaska, Various Place...
I never said it I did it or it was mine.

Had I not been there when it was done, I would have thought it was factory made; everyone who has seen it that doesn't know how it was made thinks it is factory.

Some inspectors are just looking for a reason to put into practice the old "we're not happy, 'til you're not happy" thing.

If you use Walmart wiring chances are nothing will ever come of it and nobody will ever know or care.

(However, something that could - and has - been a factor in some cases - not saying a PTT wire - is the insurance companies and post accident investigation. Even if it wasn't your fault, if they - they being ntsb, faa, insurance investigator, etc. - notice simple things not being copacetic, they tend to start digging....)


Edited by Bush Pilot (01/16/13 12:06 AM)
_________________________
You Have To Be Alive To Spend It

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#110434 - 01/16/13 01:21 AM Re: Coiled cord from push to talk on yoke [Re: Bush Pilot]
Nightowl Offline
Club Sponsor/Speed Demon
Gold Pilot

Registered: 02/14/10
Posts: 1826
Loc: Northwest lower Michigan
As I said before, I leave these things to our avionics guy. Though I've built televisions and computers, I'm not comfortable crawling around under my airplane's instrument panel. The curly cord on our co-pilot PTT switch (built into the yoke) failed a few years ago, so I just got Mark to take care of it. Minimal expense, and it still works like a charm. I don't do drywall, and I don't do under the panel wiring. I know better.

John
_________________________
CP-ASEL-IA
'77 C172N, AirPlains 180 hp conversion

Our sigmap has been flown entirely using aircraft with capabilities at or below those of the C-172.


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#111604 - 01/23/13 03:41 PM Re: Coiled cord from push to talk on yoke [Re: Nightowl]
darrel Offline
Safety Pilot

Registered: 08/23/11
Posts: 30
Loc: PA
Well fellows,
I'm sure glad for the input from you all. A fellow club member has some coiled wire left over from his order that he has volunteered. He is a knowledgeable engineer/mechanic and I hope he can supervise my repair. My AI will sign it off. Thanks, Darrel
_________________________
Darrel Robinson

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