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A new type engine test plant is described, and service experience and cost information collected during six years of actual operation is given. The new design seems to give several advantages compared to conventional test plants, such as: Better sound proofing More compact size Higher capacity - up to 1200 engines per year per test bed may be run due to the sound proofing permitting round the clock operation and because very little time is lost on engine changes More convenient working conditions due to engine being installed at suitable working height above the floor and all work being carried out in regular shop standard localities Better engine cooling through ram pressure simulating airplane operation, and easily adjustable, sufficient air flow for the entire power range Better measuring facilities Constant induction air temperature and carburetor altitude chamber No requirements for auxiliary power (the amount absorbed by servo and lighting circuits is negligible).