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lucagi

Right engine doesn't start

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I've a problem after installing the last comprehensive fix 2922: I can't start the right engine. It's all ok with the left engine, but when i rotate the ignition on GND, nothing happens with the right engine. I haven't failures active. Someone can help me?Thank you LucaItaly

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Did you monitor your N2? Is it increasing? It is possible to not have enough APU bleed. Try to put to OFF the left engine bleed air and packs also to OFF and monitor if N2 increases.

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I always have the Isolation valve to open for start, and then ensure the pack's are off. Don't know if it makes any difference, but all the checklists I have read have you starting the right before the left. Never tried it the other way.. G

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Haha. I had this problem today, was about to taxi off, but couldn't get the right engine to start, the left started fine but the right just wouldn't do anything. Took me 15 minutes until I realized the isolation valve was off, not in the auto position as it should be. If your unsure, the isolation valve is the switch between the Packs.

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What exactly does the isolation valve isolate? - I'm not at home right now so I don't have the Manual to hand.
It isolates the left side from the right !!! If you look at the lines on the panel it shows the connections in the system .. .. .. G

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think we all missing some thing here, the op has stated that he has no problem in starting the left engine. and cant start the right engine. So we can assume he knows how to start the engines , so it should be the same proceedure for the right engine. The only thing i can think of he has made some switch selection in between starting the left engine after trying to start the right engine for some unkown reason.

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I had the same issue. Had a heck of a time finding a solution in the manual. However, the amplified procedures on page NP.21.16 seem to be incorrect. Here is how I set up the Air Conditioning Panel: PACK Switches - OFFISOLATION VALVE switch - OPENBLEED Air Switches OFFAPU BLEED - ON After starting the left engine, I turn on its BLEED Air Switch. This causes the DUAL BLEED light to illuminate. I then am able to start the right engine.

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think we all missing some thing here, the op has stated that he has no problem in starting the left engine. and cant start the right engine. So we can assume he knows how to start the engines , so it should be the same proceedure for the right engine. The only thing i can think of he has made some switch selection in between starting the left engine after trying to start the right engine for some unkown reason.
Erm the isolation valve will cause that, without having to press anything between starting the left then right. If he is turning the left pack on after starting the left then that would also cause the pressure to drop.. .. G

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I had the same issue. Had a heck of a time finding a solution in the manual. However, the amplified procedures on page NP.21.16 seem to be incorrect. Here is how I set up the Air Conditioning Panel: PACK Switches - OFFISOLATION VALVE switch - OPENBLEED Air Switches OFFAPU BLEED - ON After starting the left engine, I turn on its BLEED Air Switch. This causes the DUAL BLEED light to illuminate. I then am able to start the right engine.
From the checklists that I have gone by the engine bleeds normally get turned on with the APU bleed and left on. Which has never caused me a problem, I see what you mean about the procedures in the manual though - packs on auto/high ?? That would cause a problem !! G

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think we all missing some thing here, the op has stated that he has no problem in starting the left engine. and cant start the right engine. So we can assume he knows how to start the engines , so it should be the same proceedure for the right engine. The only thing i can think of he has made some switch selection in between starting the left engine after trying to start the right engine for some unkown reason.
Assumption is the mother of all failures. There are a handful of users on here who have experienced the exact same scenario including myself. I was able to start up engine one perfectly. Engine 2 would not start up at all, I checked everything I did for Engine 1, it just didnt make sense - turned out the isolation valvue wasn't set properly.... left if its current setting engine one would always have the requires pressure to start, whereas engine 2 wouldnt.

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What is the pressure in the rigt duct? It is shown on the Overhead panel, try to make a screenshot of the overhead in the moment of right engine start.Isolation valve AUTO, there is an AUTO logic, it seems noone want to use it.APU bleed feeds only left side, for right engine the crossbleed (isol valve) must be open (and in the AUTO position the aircraft knows when to open the crossbleed)Packs must be OFF as they remove air for the starting.The left engine is simple to start, no logic, no isolation valve, just the switch, the pack itself will not cause a complete pressure lose.If it is a bug, just post an image when it happens, you never told us the pressure in the RH duct in that moment and never told if you tried a crossengine start and if it worked.About bleed on or off during start, they can be left on as tey will not come on during start.

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I'm sure that packs and the other elecotrs are in the right position (remember: "after installaing last comprehensive hotfix" I've said, in the past everything works).The same, I'll check again each selector, packs and so on, also the isolation valve. But there's another problem: the Fmc in the Setup doesn't want to save panel state neither load panel state or choosing a start-up configuration! LucaItaly

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Had the same problem but I noticed my pressure was not above 30, and it needs to be above 30 to start engine 2. Now i start up both engines like this - just turn off your right pack and it should work, and if it doesn't, try both packs, that should definitely get it up and running. It will not start though at less than 30.

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Had the same problem but I noticed my pressure was not above 30, and it needs to be above 30 to start engine 2. Now i start up both engines like this - just turn off your right pack and it should work, and if it doesn't, try both packs, that should definitely get it up and running. It will not start though at less than 30.
Your issue is different from the Luca's one, You MUST turn off both packs to start the engines. It is written in the checklist.It is not a bug, it is an user error. Luca, what is the pressure of the right duct? Screenshots? Tried cross engine start? It works?If it continues try to uninstall the NGX then install again with the hotfixes.Report again if it solves.

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Had the same problem but I noticed my pressure was not above 30, and it needs to be above 30 to start engine 2.
As long as there are no bleed air consumers, the APU will reduce the bleed pressure. This is a feature, not a bug. Once you turn an engine start switch to GND opening the start valve, you will see the APU increase the pressure.

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It does not matter if the engine bleed switches are on or off for engine starting because when you turn the engine start switch to Ground (GRD)it automatically closes the bleed air valve until after the engine has started and the GRD switch trips off again.You would then turn on bleed air for the started engine because it NOW can supply bleed air. ( the DUAL BLEED light is to remind the pilots that there is a possibility that the engines bleed air could Back Pressure the APU )Especially if both engines are running and the isolation valve has been left open. Fred.

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I've always flown with the 737 and I know it well and the procedures too. I've tried checking everything and everything was ok to starting engine. The only thing I've done is to uninstall and install it again and now it works! I don't know what's happened, but now it works :) But it isn't solved the other matter with the Fmc: I can't save neither load a panel state. And the same, I can't load a start-up situation :(I.E to save a panel state I write the file name in the "save state" page, the name was transferred in the dotted line and lighted, but does'nt appear the "save" button to push, only the "erase" button. If I want to load a panel state, I chosse it from the list, it was lighted, but I've only a "cancel" button, not a "load" button.I've tried to check in the list if there is my new saved panel state, and obviously, it was not. Thank you LucaItaly

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But it isn't solved the other matter with the Fmc: I can't save neither load a panel state. And the same, I can't load a start-up situation sad.pngI.E to save a panel state I write the file name in the "save state" page, the name was transferred in the dotted line and lighted, but does'nt appear the "save" button to push, only the "erase" button. If I want to load a panel state, I chosse it from the list, it was lighted, but I've only a "cancel" button, not a "load" button.I've tried to check in the list if there is my new saved panel state, and obviously, it was not. Thank you LucaItaly
When the name gets highlighted, Press the 'Execute' button to complete the save. You should see the message "saving panel state...", and after a moment, you'll see the message "successfully saved to ####" (where #### is the name you saved it to). When you're loading, it's the same after choosing the panel state, you hit the 'Execute' button and you'll get the message 'loading panel state'. Cheers

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