公开(公告)号：US09745068B2

公开(公告)日：2017-08-29

申请号：US15074468

申请日：2016-03-18

Applicant: Textron Innovations Inc.

Inventor： Daniel W. Hodges ,  Nallusamy Paraman ,  Robert Ferenc

IPC: F25D21/14 ,  B64D13/06 ,  B23P6/00 ,  F25D21/00 ,  F24F13/22

CPC classification number: B64D13/06 ,  B23P6/00 ,  B64D2013/0644 ,  B64D2013/0662 ,  F24F13/22 ,  F24F2013/227 ,  F25D21/00 ,  F25D21/14 ,  F25D2321/00 ,  F25D2321/14 ,  Y02T50/56 ,  Y10T29/49721

Abstract: A method for retrofitting an aircraft air conditioning unit drainage system comprises the step of removing drain pipe from the unit housing. A hole from which the drain pipe extends is plugged. A first location within a unit housing is determined where during operation of the unit air pressure is lower than at a second location. A second location below the first location is also determined where pooling occurs. A first and a second conduit with first and second internal diameters are respectively located at the first and the second locations. The first conduit and the second conduit are connected to a third conduit which extends generally vertically and which has a third internal diameter that is generally equal to the first internal diameter. A fourth conduit with a fourth internal diameter that is less than the second internal diameter is connected to the third conduit below the second location.