Hi Pilots,

 

i have Service based failure on the active failures are APU bleed fail and ENG bleed fail. The Engine will not start in this case. The PSI ist 0 % . What can i do so the engine is starting ?

 

best regards,

 

and sorry for the bad engish. :)

External air start?

How ist the procedure for a External air start ?

 

I seach for external power in youtube . i found a video. i have make the procedure and ist was right. thank you for this !!!

Well, if you have an engine bleed fail, you won't be flying anyways, so no need to start the engines...in theory you could use the air cart to start one engine externally, but to start the other engine you would still need to cross bleed the air from 1 to 2 and with no duct pressure that's not going to happen. The process for the external start is close to the same as a normal APU start. Open the pack of the engine you wish to start. This will provide air flow to that engine for spoiling. Start lever to idle at 25% n2. In your case this would be as far as you could go in your situation. You would then normally disconnect the air started unit. Push back. then rev up the started engine to about 30% N1. Cross bleed your engine packs to supply air to the second engine to supply sufficient air to start. But since you have no engine bleed this won't happen for you. You wouldn't want to be doing any flying though with these failures. This could cause pressurization problems and if you had an engine failure off the ground you would never get it started again!

 

-Dan Burke-

If you do a search in the fcom manual it brings up all the pages you need to do just type external air

As soon as I can check DDPG I can tell you if you can do a flight in this condition, however, basically, both engines can be started with the ground cart, it will be more tricky for the engine number 2 as the ground crew must walk under the belly of the aircraft to disconnect the air cart tube while the engine is on, but, no reason to not do it.

Then, An unpressurized flight is still possible, if potable water compressor is installed also toilettes are avaiable, hydraulic reservoir pre-pressurization must be checked before departure.

Obviously if an engine shuts down in air at low speed (so windmilling restart is not possible) there will be a big problem.

Other than this, it is quite impossible to have a triple bleed failure, normally due to the limitation a single bleed failure is the maximum you will see.

thanks all for the reply .

FCOM vol.1 page SP.7.5 explains ground air cart and crossbleed start..