kosmonooit Posted November 23, 2019 Posted November 23, 2019 Found some more info: these wheelsets have a mechanism to relive high pressure to prevent them exploding. These probably blew after it had left the runway, the heating was mainly due to brakes working hard to bring this fully laden bad boy to a stop. Source: a 777 FO Bonus 1
kosmonooit Posted November 23, 2019 Posted November 23, 2019 From what I read on one aviation site, the objective was (and always is) to put the plane back down on the ground immediatley, regardless of anything else..... Juan (as above) says they drill this routine all the time, everyone is be briefed at take off for such an event, and they even know what distance they need to stop with the given load. The aircraft is rated to land with full tanks, they would only dump at 10000 ft anyway, the circuit there is 5000 ft Bonus 1
Spokey Posted November 24, 2019 Posted November 24, 2019 Found some more info: these wheelsets have a mechanism to relive high pressure to prevent them exploding. These probably blew after it had left the runway, the heating was mainly due to brakes working hard to bring this fully laden bad boy to a stop. Source: a 777 FOhttps://youtu.be/c9K9s48glZoWas sbout to reply re the Fuse Plugs. Those tyres had not exploded in that pic. Just a deflation. Nice explantion from Juan in the video. Had it once in Juba, South Sudan, on my old DC8 freighter. Much tight ground manouvering after a max weight landing and one of the tyres had had enough. If I remember correctly we had to wait around 4 hours until it was all cool enough to change the wheel.......ahhhhhhh, Freight Dog days! DJR, Long Wheel Base, BigDL and 2 others 5
Spokey Posted November 24, 2019 Posted November 24, 2019 (edited) Had just my second Round The World flight last week. Was great crossing The Barents Sea, Anchorage to Harbin in China. Cold for this South African fellow! Warmed up to a balmy Minus 12 in Harbin on landing.From 179 West to 179 East, my Tuesday morning became Wednesday morning! Edited November 24, 2019 by Spokey Lotus, RoddieJ, Patchelicious and 8 others 11
Spokey Posted November 24, 2019 Posted November 24, 2019 9am departure from Anchorage, a little deicing to get us on the way. BigDL, dirtypot, kosmonooit and 3 others 6
mazambaan Posted November 24, 2019 Posted November 24, 2019 From what I read on one aviation site, the objective was (and always is) to put the plane back down on the ground immediatley, regardless of anything else. Also it said that the tyres are designed to "explode and deflate to prevent them catching fire" from the super hot brakes. When exactly they explode, I don't know. Maybe someone can confirm or refute the explanation . . . . Not sure if the tyres "explode" when over heated (by the brakes) or if there are fuse plugs that blow at a high temperature. Someone will put me right. Bonus 1
kosmonooit Posted November 24, 2019 Posted November 24, 2019 Had just my second Round The World flight last week. Was great crossing The Barents Sea, Anchorage to Harbin in China. Cold for this South African fellow! Warmed up to a balmy Minus 12 in Harbin on landing. The BC Helicopters guys who did a round the world trip on a R22, they came the opposite way though up from Japan, in more favorable weather, but did some great vlogs on the trip.
DJR Posted November 24, 2019 Posted November 24, 2019 ........... 9am departure from Anchorage, a little deicing to get us on the way.Tell us a bit more about de-icing. What do they spray? Why does it not freeze immediately again at those temps? Bateleur1 1
Bonus Posted November 24, 2019 Posted November 24, 2019 Not sure if the tyres "explode" when over heated (by the brakes) or if there are fuse plugs that blow at a high temperature. Someone will put me right. The video says metal alloy plugs with a low melting temp :-)
Bateleur1 Posted November 24, 2019 Posted November 24, 2019 Tell us a bit more about de-icing. What do they spray? Why does it not freeze immediately again at those temps? From wikipedia .. De-icing fluids typically consist of a glycol-water solution containing a dye and agents to protect the metal surface. A range of glycols are employed. Thickeners are also used to help the deicing agent adhere to the airplane body.[2]:43 Ethylene glycol (EG) fluids are still in use for aircraft de-icing in some parts of the world because it has a lower operational use temperature (LOUT) than PG. However, PG is common because it is less toxic than ethylene glycol.[3]:2–29[4] Article is here ... https://en.wikipedia.org/wiki/De-icing DJR, Long Wheel Base and Spokey 3
Spokey Posted November 24, 2019 Posted November 24, 2019 Tell us a bit more about de-icing. What do they spray? Why does it not freeze immediately again at those temps?The Wiki article refered to by Bateleur 1 is good. For info, on that day we just used the heated Type 1 fluid to remove ice deposits from the wing. The snow was very light but we had freezing rain. It formed small rough ice cones on the wings. Our aerie must have a very clean wing to fly, it is very unforgiving of contamination on the upper surface.As the rain had stopped and the taxi to take off was short I was able to forgo the anti icing. The anti icing we typically apply before take off is a thicker Type IV. It normally blows off the wing by lift off but by then has done its job. All very messy stuff indeed. DJR 1
Long Wheel Base Posted November 25, 2019 Posted November 25, 2019 None of you spot ZS-SDE arrive on Saturday? It wasn't on the ground long, our pilots spent the rest of the weekend doing training on it. The last one, ZS-SDF should arrive this week. Bateleur1 and Lotus 2
Bateleur1 Posted November 25, 2019 Posted November 25, 2019 None of you spot ZS-SDE arrive on Saturday? It wasn't on the ground long, our pilots spent the rest of the weekend doing training on it. The last one, ZS-SDF should arrive this week. Sorry, the Magaliesberg prevent me from seeing it. Long Wheel Base 1
Bonus Posted November 25, 2019 Posted November 25, 2019 None of you spot ZS-SDE arrive on Saturday? It wasn't on the ground long, our pilots spent the rest of the weekend doing training on it. The last one, ZS-SDF should arrive this week. Sorry, the Magaliesberg prevent me from seeing it. Sorry, the curvature of the Earth prevented me from seeing it. Bateleur1, Long Wheel Base, Spokey and 1 other 4
Robbie Stewart Posted November 25, 2019 Posted November 25, 2019 None of you spot ZS-SDE arrive on Saturday? It wasn't on the ground long, our pilots spent the rest of the weekend doing training on it. The last one, ZS-SDF should arrive this week. I am curious, and no need to respond of you feel it is unreasonable in me asking, but what is the mood like around the floor with the current issues faced by SAA / SAAT, and also considering these new planes? I realise they are cost saving measures, but I am somewhat surprised that the leasing and financing institutions who are driving this are going ahead with the deal, or is it a matter of the ship has already left the harbour, and there is no calling it back?
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