WHAT?......what's that at 5:28? You can see right into the engine cowling? Is a fire seal missing? How is the fire extinguishing agent going to snuff out a fire with those big gaps in the cowling? Are CFM cowlings normally that open? The V-2500 cowlings are sealed in order to retain the extinguishing agent.
@Sterlingjob The core of the V2500 has a very specific inlet and outlet. Everything else is sealed to retain extinguisher agent. In fact the core cooling-air outlet (hot air) caused heat damage to the composite TR cowling. But has been recently modified to reduce this.
@Sterlingjob What about fire extinguishing? Oxygen laden air feeds a fire. What about that? All I'm saying is that on the V2500 they mostly seal the core and the reason is to retain fire extinguishing agent inside the cowling. I was just wondering how CFM fights fires with all those gaps in the cowling.
@JetMechMA Well we know that a fire bottle is pretty large, so if there is a fire in the core a large blast of methyl bromide or halon whatever they use now is going to put the fire out, you only want to get rid of the flames and if there are gaps at the rear then it will help channel halon evenly.
There must be certain amount of ventilation around the core to keep it under 240. If i remember ill look it up at work tonight
@Sterlingjob I'm not sure if you are understanding what I'm saying. If English isn't your first language, then I apologize for not saying it more clearly. I had said that the V2500 design philosophy is to seal OFF the core except for a small opening at the bottom. This in order to RETAIN extinguishing agent. From your video I can see gaps in CFMs cowling, and so I wonder how they keep exinguishing agent in long enough to fight a fire. You'll look it up. OK then, cool. Thanks. Just wondering.
At 4:24 it looks like somebody installed that radar altimeter antenna wet with sealant, but it was too soon till the next flight and at takeoff the sealant blew down the fuselage because it wasn't cured yet. Hard to say for sure but that's what it looks like.
@Adridel94 That is your ram air intake for the air conditioning heat exchangers, basically air is bled off engine and is too hot to use so it passes through the primary heat exchanger to reduce temperature further. The small pipe sprays water onto the exchangers which aids cooling and reduces the size of the exchangers. The water comes from a water separator in the air con system, thats why the cabin air is usually dry!
Hi good video. Do you know what you can turn the blades more easly? Do you know how many kilos is the blades? Thank you in advance and sorry for my english.
Nice video. You make good videos.
JetMechMA 2 months ago
WHAT?......what's that at 5:28? You can see right into the engine cowling? Is a fire seal missing? How is the fire extinguishing agent going to snuff out a fire with those big gaps in the cowling? Are CFM cowlings normally that open? The V-2500 cowlings are sealed in order to retain the extinguishing agent.
JetMechMA 2 months ago
@JetMechMA The core must be vented somewhere, it wouldn't be sealed now would it!!??
Sterlingjob 2 months ago
@Sterlingjob The core of the V2500 has a very specific inlet and outlet. Everything else is sealed to retain extinguisher agent. In fact the core cooling-air outlet (hot air) caused heat damage to the composite TR cowling. But has been recently modified to reduce this.
JetMechMA 2 months ago
@JetMechMA The core area is vented to prevent heat build up.
Sterlingjob 2 months ago
@Sterlingjob What about fire extinguishing? Oxygen laden air feeds a fire. What about that? All I'm saying is that on the V2500 they mostly seal the core and the reason is to retain fire extinguishing agent inside the cowling. I was just wondering how CFM fights fires with all those gaps in the cowling.
JetMechMA 2 months ago
@JetMechMA Well we know that a fire bottle is pretty large, so if there is a fire in the core a large blast of methyl bromide or halon whatever they use now is going to put the fire out, you only want to get rid of the flames and if there are gaps at the rear then it will help channel halon evenly.
There must be certain amount of ventilation around the core to keep it under 240. If i remember ill look it up at work tonight
Sterlingjob 2 months ago
@Sterlingjob I'm not sure if you are understanding what I'm saying. If English isn't your first language, then I apologize for not saying it more clearly. I had said that the V2500 design philosophy is to seal OFF the core except for a small opening at the bottom. This in order to RETAIN extinguishing agent. From your video I can see gaps in CFMs cowling, and so I wonder how they keep exinguishing agent in long enough to fight a fire. You'll look it up. OK then, cool. Thanks. Just wondering.
JetMechMA 2 months ago
At 4:24 it looks like somebody installed that radar altimeter antenna wet with sealant, but it was too soon till the next flight and at takeoff the sealant blew down the fuselage because it wasn't cured yet. Hard to say for sure but that's what it looks like.
JetMechMA 2 months ago
@JetMechMA Nah its because we smeared DC4 around the rad alts to stop rain water going over them and causing spurious rad alt faults.
Sterlingjob 2 months ago
@Sterlingjob OK. I was just wondering. I'm not a line mechanic and I hadn't heard about problems with the radio altimeters.
JetMechMA 2 months ago
What is thant hole, from 1:32 to 1:38?
Adridel94 8 months ago
@Adridel94 That is your ram air intake for the air conditioning heat exchangers, basically air is bled off engine and is too hot to use so it passes through the primary heat exchanger to reduce temperature further. The small pipe sprays water onto the exchangers which aids cooling and reduces the size of the exchangers. The water comes from a water separator in the air con system, thats why the cabin air is usually dry!
Sterlingjob 8 months ago
Hi good video. Do you know what you can turn the blades more easly? Do you know how many kilos is the blades? Thank you in advance and sorry for my english.
Raider1Suisse 8 months ago
@Raider1Suisse Wouldnt know how heavy they are as ive never taken one of these blades out, maybe 1-2kgs?
Sterlingjob 8 months ago