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601 XL manual online?

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pchap(at)primus.ca
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Posted: Wed Feb 24, 2010 10:04 pm Post subject: 601 XL manual online?

Is there a 601 XL manual online anywhere?



I'm curious whether the Maximum Zero Fuel Weight is listed in it.



The FAA and Zenith had different interpretations of the practical 

meaning of the term (according to the recent FAA report), but in any 

case if a value is used in strength calculations, then the chosen 

value should be in the manual -- just as it would be for a large 

aircraft where there is a MZFW limitation.



Peter Chapman

Toronto, ON

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pchap(at)primus.ca
Guest

Posted: Thu Feb 25, 2010 7:12 am Post subject: 601 XL manual online?

At 01:05 25-02-10, I wrote:

 	  Quote: 	
		  Is there a 601 XL manual online anywhere?



I'm curious whether the Maximum Zero Fuel Weight is listed in it.


	




On re-reading the FAA report, I think my second question has been 

answered. It suggests no MZFW was listed.



It's pretty sloppy engineering to calculate wing strength based on a 

MZFW using zero fuel and then not tell customers about it.



In other words, the calculations for full load (1320 lbs) assumed 

that the wing tanks were full, providing a reduction in wing bending 

moment and easing the structural requirements. The plane wasn't 

designed for loading up heavily and then putting in only quarter 

tanks to avoid going over gross.



A MZFW using zero fuel, as the company did, suggests that the 601 XL 

(pre-modification) should not have been loaded beyond 1176 lbs, 

excluding fuel.   ( 1320 - (24 US gal * 6 lbs/gal) = 1176 )



In some areas the FAA was a little tough on Zenith, saying things 

that may well apply to a bunch of other manufacturers too, but Zenith 

was the one in their sights. Still, other criticisms are pretty valid.

Peter Chapman

Toronto, ON

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jmaynard

Joined: 27 Feb 2008
Posts: 394
Location: Fairmont, MN (FRM)

Posted: Thu Feb 25, 2010 7:34 am Post subject: 601 XL manual online?

On Thu, Feb 25, 2010 at 10:11:33AM -0500, Peter Chapman wrote:

 	  Quote: 	
		   On re-reading the FAA report, I think my second question has been answered. 

 It suggests no MZFW was listed.


	


This is correct. The AMD POH lists no MZFW. I'm not sure what I think about

that, but it appears that the actual MZFW should be 1250 pounds, and that's

not that restrictive: it suggests a minimum fuel load of just under 12

gallons at max gross, and that's getting to be pretty marginal anyway.

-- 

Jay Maynard, K5ZC, PP-ASEL, CFI-SP   http://www.conmicro.com

http://jmaynard.livejournal.com       http://www.tronguy.net

Fairmont, MN (KFRM)                        (Yes, that's me!)

AMD Zodiac CH601XLi N55ZC http://www.tronguy.net/N55ZC.shtml

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_________________
Jay Maynard, K5ZC
AMD Zodiac XLi N55ZC

johndread(at)aol.com
Guest

Posted: Thu Feb 25, 2010 4:54 pm Post subject: 601 XL manual online?

What FAA report?

 

   

 

  

   

 

   

 

  --

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xl(at)prosody.org
Guest

Posted: Thu Feb 25, 2010 9:49 pm Post subject: 601 XL manual online?

http://www.eaa.org/news/2010/2010-02-22_zodiac.asp

EAA News - FAA*s Zodiac Aircraft Report Sets Future Direction



February 22, 2010 -- Several factors, including a wing structure that does 

not meet ASTM standards for light-sport  aircraft, are indicated as causes 

for Zodiac CH601XL and CH650 aircraft in-flight accidents, according to a 

comprehensive  Federal Aviation Administration report released today.



http://www.eaa.org/news/2010/Zodiac_Review_%20Report.pdf

http://www.eaa.org/news/2010/ZodiacReportAppendix.pdf



Joe E (at) BFI

N633Z, 616 hours

CH601XL AOG



On Thu, 25 Feb 2010, johndread(at)aol.com wrote:

[quote] What FAA report?

 --

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Pete54

Joined: 27 Aug 2009
Posts: 19
Location: Scotland

Posted: Fri Feb 26, 2010 9:12 am Post subject: Re: 601 XL manual online?

The LAA modifications for the UK fleet set a compulsory maximum fuselage weight of 494kg, 1087lbs following their re-analysis of the airframe.



It still leaves a reasonably payload but does indicate the apparent short comings their saw in the design do exist.

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