Thank you for choosing Aerospace-Aviation360 for Part Number 5766078 described as Analyzer, Refrigeration Freon System. Portable Unit For Troubleshooting System And The Accuracy Of Freon Controller. by Mcdonnell Douglas. This is an ASAP Semiconductor owned and operated website. We are a leading supplier of aircraft tooling parts. You have 24/7 x 365 access to our diverse product database with the fastest lead times in the industry.