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02-01-2008, 04:42 PM
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Join Date: Apr 2006
Location: Lantz,Nova Scotia ,Canada
Posts: 556
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Canadian MDRA inspection. Bolts
A friend who is building a Sea Ray was told by the MDRA inspector that any bolts used where they will rotate ie: elevators,rudder,ailerons, control rods etc have to have castle nuts and cotter pins instead of nylocs.
Did anyone run across this with their inspector?
It doesn't make a lot of sense that nylocs work fine in the US, but are unsafe in Canada.
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Paul Tuttle
RV 8
C-FPVT
Flying.
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02-01-2008, 04:48 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Any bolt that is subject to rotation must be safetied. A nylock (in this situation) is not sufficient in the US either. Ref. AC43.13-1B Chapter 7 paragraph 7-64.a.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Last edited by Mel : 02-01-2008 at 04:53 PM.
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02-01-2008, 05:22 PM
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Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,745
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Quote:
Originally Posted by Paul Tuttle
A friend who is building a Sea Ray was told by the MDRA inspector that any bolts used where they will rotate ie: elevators,rudder,ailerons, control rods etc have to have castle nuts and cotter pins instead of nylocs.
Did anyone run across this with their inspector?
It doesn't make a lot of sense that nylocs work fine in the US, but are unsafe in Canada.
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The bolt and rod end eye are stationary and locked together. The rod end housing swivels on the eye. |
02-01-2008, 05:49 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Ross,
The Sea Ray doesn't use rod end bearings. The hinges swivel on the bolt.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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02-01-2008, 05:53 PM
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Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,745
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Quote:
Originally Posted by Mel
Ross,
The Sea Ray doesn't use rod end bearings. The hinges swivel on the bolt.
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Ahha. Better cotter pin 'em then. Losing an elevator will spoil your landings I hear. Thanks Mel. I've had people ask me this same question on RVs. |
02-01-2008, 05:58 PM
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Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
Posts: 2,406
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Same MD-RA must have missed this on two SuperCubs as I just had (yesterday) an AME look over mine and he picked that out for me to replace. He said that he doubted it would ever cause a problem but it's not up to standards. I will change them to castle nuts.
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02-01-2008, 06:20 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Here is a good example--------I just installed the cables that hold the rear seat shoulder harnesses. Exactly same cable/clevis setup as the rudder cables.
Rudder uses castellated/cotter pin. Seat belt uses nylock.
Only difference is that the rudder is expected to have motion at the connection.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010 
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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02-02-2008, 09:35 AM
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Join Date: Dec 2006
Location: Carp, Ont
Posts: 347
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I got the same information
Hi Paul, I got the same info from my MD-RA guy. He came to inspect my quick build and I already had the stick, elevator and aileron parts in and he made me change all the nuts and bolts to castle style. It only cost $10 - $15 for all the new hardware so I figured why argue. He will also get you for the vans heater box because it is made of alum instead of SS. I just changed mine.
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02-02-2008, 09:53 AM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,027
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Quote:
Originally Posted by andrew phillips
Hi Paul, I got the same info from my MD-RA guy. He came to inspect my quick build and I already had the stick, elevator and aileron parts in and he made me change all the nuts and bolts to castle style. It only cost $10 - $15 for all the new hardware so I figured why argue. He will also get you for the vans heater box because it is made of alum instead of SS. I just changed mine.
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Yea...I heard this is what is causing a lot of Cessna's to be grounded. Can you believe it, their heat box valve is made of aluminum 
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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