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cx777

ELEC GEN 1 2 3 4 wont turn on.

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After starting up my engines in PANC the electrical generators 1 2 3 4  will not turn on. If I turn off the APU the aircraft is left without power. any suggestions? could cold weather play a factor?

Neil.V

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Did you accidentally hit the DRIVE DISConnect switches during preflight? This action cannot be reversed by pilot switch selection.


 


Also, I've noticed in beta videos that there is long delay between the engines reaching 50~55% N3/N2 and the GEN CONT OFF lights extinguishing. How long did you wait for the GEN CONT OFF lights to extinguish before turning off your APU?


 


Perhaps there is some RW pilot input required? As an engineer, I used to deselect the GEN CONT switches off for engine test runs on the ground, so I didn't get to see how long the GENT CONT OFF lights took to extinguish. I assumed they would extinguish one or two seconds after the N3's or N2's reached 50%~55% (depending on engine type). 


 


Cheers


John H Watson


 


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Ok I restarted the sim and tried to stat up the queen but shes still giving me problems I took some screenshots. I waited a few minutes before turning off the APU but still no ELEC GEN

Neil.v


Ok here are some screenshots this time ELEC GEN 3 and 4 will not turn on.

http://fsx%202017-02-10%2018-36-30-39.png



http://fsx%202017-02-10%2018-35-35-81.png


Did you try cycling them OFF then ON?

yep

 

 

Did you accidentally hit the DRIVE DISConnect switches during preflight? This action cannot be reversed by pilot switch selection.

 

Also, I've noticed in beta videos that there is long delay between the engines reaching 50~55% N3/N2 and the GEN CONT OFF lights extinguishing. How long did you wait for the GEN CONT OFF lights to extinguish before turning off your APU?

 

Perhaps there is some RW pilot input required? As an engineer, I used to deselect the GEN CONT switches off for engine test runs on the ground, so I didn't get to see how long the GENT CONT OFF lights took to extinguish. I assumed they would extinguish one or two seconds after the N3's or N2's reached 50%~55% (depending on engine type). 

 

Cheers

John H Watson

 

 

I did not hit DRIVE DISC

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So if you didn't the specify a panel state, the 747 loads with the default panel state with engines running. What is the case?

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I guess you have checked the failures just in case?

And from the defaults state to the restart of the engines, did you go through a complete power off?

Can you state what you did when from shutting down the engine to restart?

 

The idea is to see if I can reproduce your issue.

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What i did was the following load up the sim in PANC temp -13C(active sky next in the background) once the aircraft initialized I turned on the APU,shuting off engines 1,2 and 4 leaving 3 on until the APU turned on. Once the APU was on I selected APU GEN 1 then shut off engine 3. After that i began the start up procedure packs 2 and 3 off pull 3&4 ignition and flip the fuel selector on and do the same for engines 1&2. still no ELEC GEN in 1 2 3 4.

Neil.V

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Ok, I'll try that when I have finished my current flight (with the 747 off course!).

 

Is this issue occuring with a specific model, and with a specific engine type or with different ones?

 

Meanwhile can you try the following tests:

_ Load a different panel state (e.g.: C&D, short turnover...) and see if it happens as well?

_ Do the same as you did but also select the APU GEN 2 before shutting down the engine 3

_ Do different tests on the same procedures but select only the APU GEN 2 without the GEN 1, and the same procedure with the GPU instead of the APU

 

I'll run the same tests on my side at the end of my flight.

 

Edit: btw, for further posting, you'd better post in the specific 747 forum instead of the general one in order to keep the forum clean and tidy.

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Ok I will do more test I suspect it might be the cold weather, I just tried the same procedure with the same aircraft 744ERF PW But in Miami with warmer weather and the electrical generators turned on after engine start.

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This time I tested another model. The 744F GE in the same location same weather conditions same procedures,and it started up just fine, all the electric generators started up normally. Cant figure out why the 744ERF PW is giving me issues with electrical generators.

 

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I haven't flown the PW engines version but I couldn't reproduce it with the GE and RR versions.

I don't why either.

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Try out the 744F PW in PANC in cold weather, keep the engines off for a couple of minutes and see what results you get.

edit: can a mod move this topic to the 747 forum, my bad!

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After the engine starts, let it idle for awhile for the oil temperature to catch up, you might get the GEN 1 to 4 eicas warning but that's normal since the N1 % is too low

 

Just move the throttles up slightly to get them running, make sure you have the APU power on before you do this so the aircraft doesn't lose power.

 

Had this problem myself when flying the PW model, might be a bug but that's how I got it working.  I think it's because of the cold weather up at PANC that causes the engine to idle lower than normal.

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Thanks Alvin moved the throttles up slightly and the electrical generators powered up, solved my issue.

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First time I saw this during beta I was instructed how to nudge the throttles forward a little, you need to get some air flowing through those engines, especially the rollers.  This is realistic by the way.

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Interesting... To me it seems odd that a generator drive system which is designed to operate with N3 speeds from 51.4%~101.6%N3 (4,650 - 9,200 rpm) can't handle a little cold weather (especially -13C).

 

I understand that a lower idle will result because of temperatures (My tables show around 55%N3 at -30C compared to 60%N3 at 20C at sea level). This equates to a 1% idle speed change for every 10C variation in temperature. To get close to the lower limit of 51.4%N3, the temperature would have to be -60C :Tounge:

 

Of course, this is all theory/manufacturer specifications... I defer to those with more practical experience.

 

Cheers

John H Watson.

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