CwazyWabbit Posted March 31 Share Posted March 31 What are the patches on the roof either side of the window for? Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 31 Share Posted March 31 They extended the front door to suit the Jeep's longer wheelbase, so the roof had to be lengthened. Quote Link to comment Share on other sites More sharing options...
CwazyWabbit Posted April 1 Share Posted April 1 21 hours ago, Bowie69 said: They extended the front door to suit the Jeep's longer wheelbase, so the roof had to be lengthened. These patches, the rear one doesn't look to be doing anything. Quote Link to comment Share on other sites More sharing options...
hurbie Posted April 1 Share Posted April 1 21 hours ago, Bowie69 said: They extended the front door to suit the Jeep's longer wheelbase, so the roof had to be lengthened. according to the text , the chassis got extended : The 1969 body was repainted by piece and assembled onto a 2018 Jeep chassis extended by 16” to fit the wheel wells 1 Quote Link to comment Share on other sites More sharing options...
Happyoldgit Posted April 1 Share Posted April 1 So it's not a prototype Grenadier then? I'll get me coat 😉 2 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 1 Share Posted April 1 2 hours ago, hurbie said: according to the text , the chassis got extended : The 1969 body was repainted by piece and assembled onto a 2018 Jeep chassis extended by 16” to fit the wheel wells I have no idea how I managed to read that all inside out and back to front, but thank you anyway Quote Link to comment Share on other sites More sharing options...
Snagger Posted April 2 Share Posted April 2 14 hours ago, CwazyWabbit said: These patches, the rear one doesn't look to be doing anything. Those patches do look like aircraft mechanic work. The one I had yesterday had two patches of about 3’x2’ with hundreds of domed rivets. That area looked like the shell of a Dalek. 1 Quote Link to comment Share on other sites More sharing options...
JohnnoK Posted April 2 Share Posted April 2 14 minutes ago, Snagger said: Those patches do look like aircraft mechanic work. The one I had yesterday had two patches of about 3’x2’ with hundreds of domed rivets. That area looked like the shell of a Dalek. I'm an aircraft mechanic and if you presented that to me as a completed job I'd make you eat it, piece by piece with no sauce. Here's a decent repair patch in progress. 2 1 Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted April 2 Share Posted April 2 9 minutes ago, JohnnoK said: I'm an aircraft mechanic and if you presented that to me as a completed job I'd make you eat it, piece by piece with no sauce. Here's a decent repair patch in progress. Just out of curiosity, why do you rivet as appose to tig or ally mig welding Regards Stephen Quote Link to comment Share on other sites More sharing options...
Ed Poore Posted April 2 Share Posted April 2 I guess the same reason why crimps are used for most manufacturing rather than soldering. Soldering like welding is a skill and requires someone competent to do it without affecting the underlying components. Crimps and riveting are certifiable processes - once the tools have been calibrated and tested then any "monkey" can do a good job. Welding and soldering can also affect the underlying material. 2 Quote Link to comment Share on other sites More sharing options...
landroversforever Posted April 2 Share Posted April 2 Welding will also change the metallic structure too. Quote Link to comment Share on other sites More sharing options...
elbekko Posted April 2 Share Posted April 2 2 minutes ago, landroversforever said: Welding will also change the metallic structure too. And introduce stresses into the component, which isn't ideal in a high-flex environment such as airplanes. Quote Link to comment Share on other sites More sharing options...
Popular Post JohnnoK Posted April 2 Popular Post Share Posted April 2 3 hours ago, Stellaghost said: Just out of curiosity, why do you rivet as appose to tig or ally mig welding Regards Stephen Welding is a stressful procedure from a structural point of view because aluminium doesn't like concentrated heat, and requires some specialised gear. Rivets are better from a structural point of view as rivets are structurally stronger than welds. Inspecting of skins and structures is generally simpler for riveted construction as is is normally just a visual check without eddy current/ultrasonic or dye penetrant required. Mass production is also a lot simpler with rivets, particularly with the rib and stringer construction of most planes. There is a shift towards composites these days, but they often pose some major headaches for the maintenance crews due to the specialised requirements for repairing the parts. If carbon fiber is used for example, then you need titanium rivets and they are a bugger to work even before the issues of corrosion come into the picture from electrolysis between carbon/titanium/aluminium/stainless at junctions of parts. The standard "bible" for non EASA aircraft is probably AC43.13-2B which lays out the standard practices for basic procedures that don't require a specific Repair Scheme from the manufacturer. Stuff that is more complex is sent to the manufacturer for their exact requirements which will come in the form of a document with detailed drawings showing rivet specs/placing and material requirements for skins and adhesives etc etc. 3 3 Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted April 2 Share Posted April 2 27 minutes ago, JohnnoK said: Welding is a stressful procedure from a structural point of view because aluminium doesn't like concentrated heat, and requires some specialised gear. Rivets are better from a structural point of view as rivets are structurally stronger than welds. Inspecting of skins and structures is generally simpler for riveted construction as is is normally just a visual check without eddy current/ultrasonic or dye penetrant required. Mass production is also a lot simpler with rivets, particularly with the rib and stringer construction of most planes. There is a shift towards composites these days, but they often pose some major headaches for the maintenance crews due to the specialised requirements for repairing the parts. If carbon fiber is used for example, then you need titanium rivets and they are a bugger to work even before the issues of corrosion come into the picture from electrolysis between carbon/titanium/aluminium/stainless at junctions of parts. The standard "bible" for non EASA aircraft is probably AC43.13-2B which lays out the standard practices for basic procedures that don't require a specific Repair Scheme from the manufacturer. Stuff that is more complex is sent to the manufacturer for their exact requirements which will come in the form of a document with detailed drawings showing rivet specs/placing and material requirements for skins and adhesives etc etc. Thanks But I almost wish I hadn't asked.....lol Regards Stephen 1 Quote Link to comment Share on other sites More sharing options...
Snagger Posted April 3 Share Posted April 3 22 hours ago, Stellaghost said: Thanks But I almost wish I hadn't asked.....lol Regards Stephen Skin repairs are incredibly common because of all the impacts from ground equipment, especially steps, catering trucks and the occasional baggage cart. Once in a while, bird strikes are bad enough to dent or even hole an airframe. We currently have a 380 grounded in Moscow because the water service truck reversing underneath and crushing the composite “bulge” around the gear and ac packs between the wings. We had the front left door completely torn off its hinges a few years ago by an airbridge in Manila that suddenly dropped with the door open inside the cupola. 2 Quote Link to comment Share on other sites More sharing options...
Snagger Posted April 3 Share Posted April 3 On 4/2/2024 at 10:16 AM, JohnnoK said: I'm an aircraft mechanic and if you presented that to me as a completed job I'd make you eat it, piece by piece with no sauce. Here's a decent repair patch in progress. Yeah. The two plates I had were like that, but much bigger and on the exterior behind the aft door. Catering truck damage. 2 Quote Link to comment Share on other sites More sharing options...
JohnnoK Posted April 5 Share Posted April 5 On 4/3/2024 at 11:27 AM, Snagger said: Skin repairs are incredibly common because of all the impacts from ground equipment, especially steps, catering trucks and the occasional baggage cart. Once in a while, bird strikes are bad enough to dent or even hole an airframe. We currently have a 380 grounded in Moscow because the water service truck reversing underneath and crushing the composite “bulge” around the gear and ac packs between the wings. We had the front left door completely torn off its hinges a few years ago by an airbridge in Manila that suddenly dropped with the door open inside the cupola. The 380 is not going to be easy though with the composite skins they use. Is the plan to fix it on site or do a temporary repair and no-pax ferry it to home base? Quote Link to comment Share on other sites More sharing options...
Snagger Posted April 5 Share Posted April 5 12 minutes ago, JohnnoK said: The 380 is not going to be easy though with the composite skins they use. Is the plan to fix it on site or do a temporary repair and no-pax ferry it to home base? I think they are hoping to replace the composite fairings with spares. They have scrapped several 380s at Maktoum airport, so I assume they kept those panels for spares. Hopefully the pressure hull hasn’t been damaged, but the truck did wedge itself underneath pretty hard. Then there is the issue of parts embargoes into Russia - they are aimed at preventing Russian organisations, so hopefully an exemption can be arranged if required. Quote Link to comment Share on other sites More sharing options...
JohnnoK Posted April 5 Share Posted April 5 Good luck with that exemption. You may need to "add" a few other bits to the order to smooth things over..... Know what I mean, know what I mean?....😁 Quote Link to comment Share on other sites More sharing options...
Snagger Posted April 5 Share Posted April 5 2 minutes ago, JohnnoK said: Good luck with that exemption. You may need to "add" a few other bits to the order to smooth things over..... Know what I mean, know what I mean?....😁 It comes under the section title of “not my problem”. 😉 3 Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted April 5 Share Posted April 5 And here's me thinking rule #1, 2, and 3 of driving stuff around an airport was "don't crash into the planes" closely followed by "don't get sucked into a jet engine" and yet somehow people always manage it. 2 Quote Link to comment Share on other sites More sharing options...
Snagger Posted April 5 Share Posted April 5 You’d like to think so. 🙄 Apparently the 380 was fixed, ferried back and is already back in service. Quote Link to comment Share on other sites More sharing options...
JohnnoK Posted April 6 Share Posted April 6 19 hours ago, FridgeFreezer said: And here's me thinking rule #1, 2, and 3 of driving stuff around an airport was "don't crash into the planes" closely followed by "don't get sucked into a jet engine" and yet somehow people always manage it. It happens embarrassingly often, to be honest. I still maintain the driver of that particular prang had been at the deicing fluid, though. Ordinarily, you'd have a ding in a situation like that, but to be so solidly wedged in took some determination. Quote Link to comment Share on other sites More sharing options...
JohnnoK Posted April 6 Share Posted April 6 15 hours ago, Snagger said: You’d like to think so. 🙄 Apparently the 380 was fixed, ferried back and is already back in service. Lovely stuff, congrats to the AOG team! Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted April 6 Share Posted April 6 8 hours ago, JohnnoK said: I still maintain the driver of that particular prang had been at the deicing fluid, though. It is Russia after all, they have to put bittering agent in the petrol to stop them drinking it 2 Quote Link to comment Share on other sites More sharing options...
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