16 Jun 2025, 17:58 [ UTC - 5; DST ]
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Username Protected
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Post subject: Chute handle  Posted: 10 Jun 2016, 15:00 |
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Joined: 07/22/14
Posts: 10060
Post Likes: +20056
Company: Mountain Airframe LLC
Location: Mena, Arkansas
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From the SR20 at Hobby fatal accident thread............ Username Protected wrote: Does the chute handle have witness wire on it? (small brass/copper looking wire, some call it break-away wire, used to detect when a lever or push-pull cable as been actuated) Unrelated to this accident, we recently repaired a Cessna 182 that had the Air Plains IO-550 conversion. With this conversion, a header tank is installed below co-pilot floor board. There were issues (maybe only one), where a plane took off and lost power due to fuel starvation. It was concluded that if the OEM fuel selector was in the OFF position, the header tank contained enough fuel to starve the engine on takeoff. Air Plains issued a service bulletin which installed stop brackets on the OEM fuel selector so that fuel could not be turned OFF. This service bulletin also required installation of a fuel shutoff valve on the firewall (between the header tank and engine). This valve is operated by a push-pull wire like carb heat, or the alternate air door on Bonanza’s. This particular 182 had this push-pull cable knob located on the center console, just below and to the right of the mixture knob. This fuel shutoff cable also had a red knob. It also had witness wire. Full forward is fuel on, pull aft is fuel off. This particular aircraft was owned by a very low time pilot. He was training with his CFI when the prop stopped turning. CFI would not speak to claims adjuster. Claims adjuster took photos of damage and also photos of interior and panel for both repair and salvage bids. We got the job. Owner was understandably scared of the plane, not knowing why the engine quit. Therefore he ask us to find out why, and after reviewing the photos taken by the adjuster, it was very clear the fuel shutoff witness wire was broken. If Cirrus does not have witness wire on the chute handle, it should.
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Post subject: Re: Chute handle Posted: 10 Jun 2016, 22:49 |
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Joined: 04/26/13
Posts: 21698
Post Likes: +22263
Location: Columbus , IN (KBAK)
Aircraft: 1968 Baron D55
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Username Protected wrote: If Cirrus does not have witness wire on the chute handle, it should. I'm not sure it needs one. From what I've read it sounds like once the handle is pulled, the cable it's attached to is extended and remains that way. If so, it would be fairly easy to know if the handle had been pulled.
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My last name rhymes with 'geese'.
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Post subject: Re: Chute handle Posted: 11 Jun 2016, 00:36 |
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Joined: 07/22/14
Posts: 10060
Post Likes: +20056
Company: Mountain Airframe LLC
Location: Mena, Arkansas
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Username Protected wrote: If Cirrus does not have witness wire on the chute handle, it should. I'm not sure it needs one. From what I've read it sounds like once the handle is pulled, the cable it's attached to is extended and remains that way. If so, it would be fairly easy to know if the handle had been pulled.
If there exist a method to determine that the oh %#$@ handle was pulled, like you describe above, that's great. I don't know, but there were previous post that discussed if/when the chute deployed. There should be an easy means to verify, especially on this one without post impact fire.
If only a cable exist (assuming your description) from handle to chute, I'd think an impact like this would render the condition of that cable compromised. However, with a witness wire at the handle.........that could tell more.
Appears it may not be a factor in this accident. I was curious.
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If a diligent man puts his energy into the exclusive effort, a molehill can be made into a mountain
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Post subject: Re: Chute handle Posted: 11 Jun 2016, 08:07 |
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Joined: 04/26/13
Posts: 21698
Post Likes: +22263
Location: Columbus , IN (KBAK)
Aircraft: 1968 Baron D55
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Username Protected wrote: If only a cable exist (assuming your description) from handle to chute, I'd think an impact like this would render the condition of that cable compromised. However, with a witness wire at the handle.........that could tell more.
Appears it may not be a factor in this accident. I was curious. Understood, but given the forces involved in many such crashes I don't imagine that a thin copper wire would be a reliable indicator either.
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My last name rhymes with 'geese'.
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