Why PCA Unit is needed when AGPU is already there?Another important question is why the aircraft does not use the power of the AGPU to run the air conditioning system when the aircraft ground power unit (AGPU) is already connected to the aircraft. Why is there a separate machine, the Preconditioned

(PCA) Pre-Conditioned Air Hose Joint TJ793:Investing in a PCA system for your airport will increase your revenue, reduce your environmental impact and attract airlines by reducing your own costsWhether on warm or sunny days, or in cold ambient conditions, air conditioning must be used during transfe

The air source of the air-conditioning system​ can be divided into two categories, one is the hot air flow drawn from the aircraft system, which enters the cabin under the action of the air-conditioning components; the other is the ram air from the outside, which is mainly used to cool the air from the aircraft system. The gas introduced to the air conditioning unit is discharged directly after use.