Originally Posted by appfly (Post 14546142)

Why can't the ventilation in the planes run on electricity when the plane is "connected" to the gate?

Originally Posted by SirRagnar (Post 14548877)

I would think it has something to do with safety. I remember seeing an Air Crash Investigation on National Geographic which was partly caused by sitting on the tarmac with the aircon running for a long time before taking off.

That will heat up the aircon system significantly and apparently that is (at least in that plane) sitting right below one of the fuel tanks.

I am just speculating though, but I'm sure someone knows the exact reason and will pass by and tell us :)

Originally Posted by lnixon (Post 14549904)

However, you can hook up external air conditioning feeds to gate-side planes. They look like fat yellow hoses. I have no idea how common they are in our part of the world, though.

Originally Posted by Crille (Post 14551588)

As said earlier you need the APU running to get air conditioning, and most bigger airports today have a rule not to start the APU until 10min before departure. This is the case in CPH among others.

Originally Posted by oliver2002 (Post 14554647)

Noted yesterday that SK didn't use APU on the ground and also didn't have external ventilation connected to their A321 at CPH yesterday :td: Made it pretty cosy standing at the gate with 25C outside :rolleyes: Talk about saving at the wrong spot.

Originally Posted by Someone83 (Post 14555036)

Don't now the details of it, but there are quite strict restrictions regarding APU use at gate in CPH

Originally Posted by CPH Env Report 2008

The noise impact from aircraft on the ground primarily
comes from engine run-ups, but the use of APUs also
contributes to the noise exposure. Most jet aircraft have
an APU, a small jet engine which produces power and
pressurised air for the aircraft when it is on the ground
and the main engines are turned off. To reduce noise, the
APU may only be used for five minutes before the aircraft
leaves the stand and five minutes after it arrives at the
stand. For the rest of the time, the aircraft must use the
power and ventilation facilities provided by the airport at
most stands. At 103 out of the 121 numbered stands at
Copenhagen Airport, we have installed stationary power
supply facilities for aircraft. At stands that do not have
these facilities, the aircraft can use a GPU (ground power
unit), which is a diesel or electrically powered generator
that emits considerably less noise than an APU. CPH made
regular inspections during the year to monitor the use of
APUs at the aircraft stands.
In 2008, 117 inspections were made to check the use of
APUs by aircraft; a representative selection of the airport’s
stands used for jet aircraft were inspected. In 75 cases, the
rules were complied with, whilst the conditions for use of
APUs were not complied with in 42 cases. Accordingly,
36% of the inspections showed violation of the rules. An
evaluation of the last four years of aircraft stand inspections
shows that stands with power and ventilation facilities
showed a decline in violations from 62% in 2005 to
13% in 2008. The stands that do not have these facilities
saw only a small drop in violations, in spite of a campaign
to observe the rules in force brought about by the fact
that in 2008 every second aircraft (52%) did not comply
with the rules. The campaign will continue at a greater
intensity in 2009.
In connection with most of the recorded violations, CPH
took direct action by boarding the aircraft in question and
notifying the pilot that the airport’s rules on use of APUs
must be complied with.