In some aircraft the APU is required for extended range operation certification, I believe. That is, if you lose an engine the APU can be relied upon to provide power and cabin bleed air, taking the load off the remaining (operational) engine. Of course, it also provides power for engine starting and cabin bleed air in a typical APU role as well.
I’m not sure but I believe this is the case in some, if not all, Airbus airframes. -D > On Sep 20, 2021, at 12:32 PM, Kaleb Striplin via Mercedes > <mercedes@okiebenz.com> wrote: > > Not sure why, the APU really does nothing once the engines are started. In > any case they are saying another 30-45 minutes, hopefully. > > Sent from my iPhone > >> On Sep 20, 2021, at 11:24 AM, Curt Raymond <curtlud...@yahoo.com> wrote: >> >> >> I was on a flight once with a dead APU and there was no heat. Fortunately >> PWM to IAD wasn't a long flight, it was pretty cold in the plane by the time >> we landed though. >> >> That was a CRJ of some flavor... >> >> -Curt >> >> On Monday, September 20, 2021, 11:42:09 AM EDT, Kaleb Striplin via Mercedes >> <mercedes@okiebenz.com> wrote: >> >> >> Well they just rolled the air cart over and fired up the engines. Without an >> APU one engine can start the other, but with both dead mid air and no APU, I >> would only hope the airflow would be enough to spin them up. >> >> Sent from my iPhone >> >>> On Sep 20, 2021, at 10:40 AM, Floyd Thursby via Mercedes >>> <mercedes@okiebenz.com> wrote: >>> >>> I don't think they would need the starter to do an airstart if the engine >>> is spinning. >>> >>> I was on a flight once that had the BSOD on the control system, they >>> rebooted the whole airplane 3X (start, shutdown, start...) then put us off >>> to go find another airplane. >>> >>> --FT >>> >>>> On 9/20/21 11:34 AM, Kaleb Striplin via Mercedes wrote: >>>> Of course they can start the engines with the ground APU but I assume if >>>> they lost both engines in flight they would have no way to start them. >>>> >>>> Sent from my iPhone >>>> >>>>>> On Sep 20, 2021, at 10:30 AM, Kaleb Striplin <ka...@striplin.net> wrote: >>>>> >>>>> Never had this happen before. We pushed back, tug unhooked and plane >>>>> lost all power, completely dead. No lights no AC no engines. I >>>>> immediately think they lost the APU. Sure enough pilot comes on and says >>>>> we lost the “backup” power to start the engines. Now being towed back to >>>>> the gate. Guess we will need a jumpstart. >>>>> >>>>> Sent from my iPhone >>>> >>>> _______________________________________ >>>> http://www.okiebenz.com >>>> >>>> To search list archives http://www.okiebenz.com/archive/ >>>> >>>> To Unsubscribe or change delivery options go to: >>>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> >>>> >>> -- >>> --FT >>> >>> _______________________________________ >>> http://www.okiebenz.com >>> >>> To search list archives http://www.okiebenz.com/archive/ >>> >>> To Unsubscribe or change delivery options go to: >>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>> >> >> >> _______________________________________ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
