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AG5B demisters

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grumpyparts

Joined: 28 Jan 2009
Posts: 65
Location: EGHH

Posted: Mon Nov 08, 2010 5:13 am Post subject: AG5B demisters

Always believed that the AG5B's de-misters were the same as the AA5's, but no.

Have now found two AG5B's recently with badly deformed parts due to overheating and need replacements. Have any of you come across this problem before, if so what did you replace them with.



Here's a picture of both for comparison, smaller is the AA5's.

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pitts_pilot(at)bellsouth.
Guest

Posted: Mon Nov 08, 2010 5:39 am Post subject: AG5B demisters

I'm going to guess that the oval one is from an AA-1 ...... but I 

haven't looked at mine in a long time.  It seems like it was oval.   I 

can't tell from the picture, but is the bottom of the oval tube 

'round'??  Doesn't look like there's enough width for a round one 

compared to the 'smaller' one.   And 'smaller' is relative.  One is 

shorter, but wider .....

Linn



On 11/8/2010 8:13 AM, grumpyparts wrote:

 	  Quote: 	
		   



 Always believed that the AG5B's de-misters were the same as the AA5's, but no.

 Have now found two AG5B's recently with badly deformed parts due to overheating and need replacements. Have any of you come across this problem before, if so what did you replace them with.



 Here's a picture of both for comparison, smaller is the AA5's.

 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=318559#318559

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flyv35b(at)minetfiber.com
Guest

Posted: Mon Nov 08, 2010 5:56 am Post subject: AG5B demisters

 	  Quote: 	
		   Always believed that the AG5B's de-misters were the same as the AA5's, but 

 no.

 Have now found two AG5B's recently with badly deformed parts due to 

 overheating and need replacements. Have any of you come across this 

 problem before, if so what did you replace them with.


	


The oval defroster vent was used on all the AA-series planes (except maybe 

the Yankee) and the round was used on the AG-5B.  There is no heat 

distortion.  The oval duct has given everyone grief for many years when 

trying to attach a round duct to the oval outlet port.



Cliff

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grumpyparts

Joined: 28 Jan 2009
Posts: 65
Location: EGHH

Posted: Mon Nov 08, 2010 9:33 am Post subject: Re: AG5B demisters

May be I didn't make myself very clear. There is nothing wrong with the oval demister/defroster, it was purely shown for comparison to the round AG5B one which is badly deformed along with the slider, see new picture.



Out of interest the oval one shown last time is in fact a New Old Stock item, never used, think it needs to be put in the Grumman museum.

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teamgrumman(at)yahoo.com
Guest

Posted: Mon Nov 08, 2010 10:14 am Post subject: AG5B demisters

Hi Ian,

All of the early (American General) AG5B defroster ducts I've seen are deformed.  Not only that, the hole spacing is different from the AA5x series.  The best defroster ducts were made by Dave Nichols (I think that's who made them.)  I believe Garner has some of them or knows the manufacture.  Commonality of parts is what keeps the cost down.  Changing the entire design (and making it out of cheaper parts at that) was a waste of money.

Gary



From: grumpyparts  <i.r.m(at)btinternet.com>

To: teamgrumman-list(at)matronics.com

Sent: Mon, November 8, 2010 5:13:03 AM

Subject: AG5B demisters



   



         [quote][b]

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doug.ilg(at)verizon.net
Guest

Posted: Mon Nov 08, 2010 10:25 am Post subject: AG5B demisters

John Sjaardema (sp?) makes Dave Nicholas' defroster vent, now.  Give Excel Air a call.

 



Doug Ilg

Grumman Tiger N74818, College Park Airport (KCGS), Maryland

Challenger II LSS LW (N641LG reserved) - kit underway at Laurel Suburban (W18)



 



[quote]

From: Gary Vogt <teamgrumman(at)yahoo.com>

To: teamgrumman-list(at)matronics.com

Sent: Mon, November 8, 2010 1:10:26 PM

Subject: Re: AG5B demisters



 Hi Ian,

All of the early (American General) AG5B defroster ducts I've seen are deformed.  Not only that, the hole spacing is different from the AA5x series.  The best defroster ducts were made by Dave Nichols (I think that's who made them.)  I believe Garner has some of them or knows the manufacture.  Commonality of parts is what keeps the cost down.  Changing the entire design (and making it out of cheaper parts at that) was a waste of money.

Gary



From: grumpyparts  <i.r.m(at)btinternet.com>

To: teamgrumman-list(at)matronics.com

Sent: Mon, November 8, 2010 5:13:03 AM

Subject: AG5B demisters



   



          	  Quote: 	
		  



	




[b]

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grumpyparts

Joined: 28 Jan 2009
Posts: 65
Location: EGHH

Posted: Mon Nov 08, 2010 10:52 am Post subject: Re: AG5B demisters

Thanks guys. I sent the mechanics doing the work on the AG5B a selection of defrosters, the new old stock, the Dave Nichols's and the John Sjaardema one, it was when they compared it to the one fitted that it became apparent they did not have the same hole spacing as Gary says.



I was just asking the question to see whether anyone had come up with a straight replacement without having to make new attachment holes, at least the longitudinal hole spacing is correct for one side.

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grumpyparts

Joined: 28 Jan 2009
Posts: 65
Location: EGHH

Posted: Mon Nov 08, 2010 11:17 am Post subject: Re: AG5B demisters

This particular AG5B has spent some time in Canada as well as putting up with the good old UK cold and wet winters, come to think of it summers as well, which means the cabin heat has been probably used a lot. Not being able to shut the defrosters off has resulted in the windshield being badly crazed directly above the outlets and needs replacing. This cost cutting by American General is going to cost this customer dear.

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