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We ended up sticking with the Livelock fasteners I had originally spec'd out. There was nothing in the "quick disconnect" fasteners that would hold up for what we required. For info on the livelock fasteners, go to Alcoa's website, and look through their structural panel fastener PDFs. For exact...

That was one of the ideas I had had, but it seemed like a major issue to get something put in there. Do you have any recommendations for a place to locate a heated mat like you are mentioning Karl? Thanks much for the input. James Bennetts Aerospace Engineer

That's correct rb1957. They fly in an area where they have experienced, or could experience, icing conditions. It's the mission profile of the aircraft, nothing to be done to avoid it. James Bennetts Aerospace Engineer

It is indeed not in the restricted category, and no I'm afraid we cannot limit their flight conditions in that manner. The customer would almost prefer to see a total redesign of the forward installation than limit the flight conditions, especially with some of the locations these aircraft need...

Yeah there's not much I can go into as far as details. It gets very confusing because we're dealing with two cutouts, one for the installation, and one which is a vent for the avionics bay. The cutout for the installation is a 8.5 x 13.5 inch hole, roughly, and 3 inches behind that are two 6x6...

They want the fairing to protect the cutout, not the door. Modifying the exit tube is not feasible though, the flat aft face is the major load bearing member in the installation, and the exit vent is only 3 inches aft of the chute, not a lot of room on this door. And the vent can't be moved any...

Good points, but this is not a ducting. It's an installation which requires an opening to function. I'm afraid I can't go into much more detail than that. However, being in the nose (which is a kevlar/nomex composite), and just aft of the nose radome, there's not much area for a fairing...

I agree with ewh. Until it's proved itself to be at least reliable enough to compete with what's already in service, I doubt the airports (or surrounding communities) are going to fork over the necessary resources to accept these monsters. Still, it's a pretty impressive beast of a machine. I...

Not really, I'm dealing with an area that is only 13.5 inches long by 3 inches wide, and on a door that is opened before and after each flight. Therefore, I don't think an anti-ice or deice system is feasible. James Bennetts Aerospace Engineer

It's funny you should mention a Dash-8, since the aircraft we modified was a dash-7. However, we can't use any sort of by-pass ducting for this, we need some sort of fairing. I don't think bird strike is a major concern in this case, my major concern is making something that is effective enough...

I need to design a fairing to deflect air flow and water/ice from an open area on the nose of an aircraft. We did a modification which required cutting a large hole (8.5x13.5) in the avionics bay nose door, and creating a type of a chute from inside the area. Concern has been shown towards this...

Thanks Mike, that report had a lot of helpful information in it. It looks like I'm going to have to find some sort of small, regulated heating element to use. The commercial coatings out there are not going to be adequate enough to keep ice from building up in this application, which could be...

Does anyone know where I can find good data on the shear strength (or adhesion) of ice buildup on alodined aluminum surfaces? I've got an issue with an aircraft which could experience ice build-up, and I need to determine whether the ice adhesion would be significant enough to cause a misfire of...

Thanks for the tip Spar, but without being a member to that site it doesn't give any data on the fasteners, unless I'm missing something, which is entirely possible. As far as Avibank wktaylor, thanks for pointing me there. They have the same type of fasteners that I've already used though, so...

Thanks for the input, but they want something that is pre-manufactured and easily obtainable for replacement. It is an item which is prone to need replacement due to the frequency of access to the area. Total design from scratch is not an option. James Bennetts Aerospace Engineer

Sparweb, Do you have any information on where I can find that fastener data, or a part number I can look for? I haven't had any experience with helicopters or where to find inside info on parts therein. Thanks, James Bennetts Aerospace Engineer

I have indeed perused the camloc and dzus fastener catalogs extensively, as well as all of Alcoa's publications. I've been in contact with engineers at Alcoa several times now, which is where I found the fasteners currently being used. They are, however, very maintenance unfriendly, and need to...

All, I have posed a question in another thread of this site thread725-113102. I am looking for some high-strength quarter turn fasteners for a modification we've accomplished on a DHC-7. Please review and let me know if you have any additional information/ideas. I'm coming up empty with my...

Just FYI to anyone who hasn't found out already, Mil-Hdbk-5 has been superseded by MMPDS-01. If you haven't updated your sources, it's probably a good idea to do so.

The design went away from snap latches because after the modification we did, the latches were not anywhere near strong enough to handle the worst case loads that could be applied to the door; ie we went to captive fasteners. No there was no drag penalty as the original latches were indeed...