Klaus and others,
Please send me pictures of your elongations or failures of the strut for
me to analyze. If you can provide the type material and thickness also.
Normally 6061 common aluminum angle of 1.6 mm or 1/16 inch is plenty
strong enough.
Elongation of the hole at the bottom indicates slight movement of the
gear lock ,retraction mechanism (most probably in the down position) due
to not staying perfectly vertical with the gear down and eventually the
stresses from bending, as Klaus said, or from the latch slot gear
retraction arm interface bending, and or the three bolts elongation has
caused fatigue of the material or too much force on the aluminum angle
strut.
We will need some look see time to evaluate should if we go to steel or
a specific material/dimensions, time change, or what.
In the mean time, if everyone can look at their Mod 51 landing gear
retraction lever strut brace if over say 500 hours and look for wear, as
soon as you can, and low time planes on your next annual, then send me
updates, I'd appreciate it.
Many thanks,
Bud Yerly,
Europa Tech Assistance.
direct email: budyerly@msn.com<mailto:budyerly@msn.com>
or just hold control key and click below to email
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>
via Custom Flight Creations website:
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om>
----- Original Message -----
From: klaus dietrich<mailto:klaus.dietrich@oracle.com>
To: Europa-List Digest Server<mailto:europa-list@matronics.com> ;
jimmy Keppert<mailto:MCA234@aon.at>
Sent: Tuesday, July 13, 2010 1:29 PM
Subject: Europa-List: Check your Landing Gear Retraction Lever Strut
(Mod 51)
Check your Landing Gear Retraction Lever Strut (Mod 51)
after 10 years in service and some 800 hours with as many landings, my
Landing Gear Retraction Lever Strut (Mod 51) had an oval oversize hole
at the bottom end (14mm; for the MS 20392-5C37 bolt which is 9,5 mm) and
it finally broke at the top (just below the AN 3 bolt probably due to
some misalignment due to the play at the bottom...
no play at the top AN 3 bolt, however!
The three screws on the Landing Gear Retraction Lever at the top seem
to hold (no play)....
I'm still searching for an explanation; my aluminum angle was probably
not strong enough: material thickness: 1,5 mm; L-profile: 20 mm x 8 mm
also the strut is not absolutely straight and there is some sideways
flexibility which may have favored the play...
Klaus
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