---------------------------------------------------------- Allegro-List Digest Archive --- Total Messages Posted Sun 05/28/06: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:28 AM - Re: Stall Warning System (Thom Riddle) 2. 09:08 AM - Re: gear leg cracks (Thom Riddle) ________________________________ Message 1 _____________________________________ Time: 03:28:59 AM PST US From: Thom Riddle Subject: Re: Allegro-List: Stall Warning System --> Allegro-List message posted by: Thom Riddle Hugh, Our Allegro has the stall warning system installed but we did not install it. However, Frank Cuba, the dealer in Nebraska from whom we bought ours did either a replacement or repair of the stall warning system on our airplane just before we bought it. I'm sure he knows the details of how it goes together and has always been helpful to us. I would contact him and tell him I suggested it. He is on Matronics List so you should be able to get his email there. If you don't find it, let me know off list and I'll send you all his contact info. Thom in Buffalo ________________________________ Message 2 _____________________________________ Time: 09:08:58 AM PST US Subject: Allegro-List: Re: gear leg cracks From: "Thom Riddle" --> Allegro-List message posted by: "Thom Riddle" IMPORTANT UPDATE ON GEAR LEG CRACKS. Upon removal of old gear legs, to install new ones, we found that there was a crack on the upper surface of each gear leg where it makes contact at the entrance to the fuselage gear leg socket. I'm attaching a photo below showing this. I ground down the small 1" crack and determined it was only skin deep (through the gel-coat only) on both legs. However, the longer (all the way across the leg) cracks were more than skin deep. They went at least through the first layer of cloth. THESE BIG CRACKS WERE NOT VISIBLE WITHOUT REMOVING THE GEAR LEG CLAMPING BRACKET AND MOVING THE GEAR LEG AWAY FROM THE FUSELAGE !!! Please look for cracks at this location during your inspection. I would also recomend taking a measurement between the gear legs at the axle and occasionally check this distance to detect some sag in gear before failure. This should be done at the same weight on each check. We are now doing it with the main tank full but no occupants. If this distance gets larger, it could be an early warning of impending gear cracks or complete failure. My Opinion as to cause: It appears that when the gear leg flexes, the stresses are concentrated where the leg enters the fuselage gear socket, partly because there is a relatively sharp edge where they come into contact with each other. In my opinion, there should be a gap at this point so the leg can flex some before coming into contact with this relatively sharp edge. I am not a structural engineer but a retired mechanical design engineer and this looks like a problem area to me. I have an idea of how to fix this but won't post it here because I don't want anyone thinking that I am redesigning the Allegro and I don't want any liability for others actions based on my ideas. You can blame the lawyers for this. PLEASE INSPECT YOUR GEAR LEGS at the fuselage entrance point. -------- Thom in Buffalo Read this topic online here: http://forums.matronics.com/viewtopic.php?p=36970#36970 Attachments: http://forums.matronics.com//files/original_rt_gear_leg__cracked2_677.jpg