Thank you for choosing Aerospace-Aviation360 for Part Number 3965776 described as Sensor No-2, Cabin Temperature Tester. Flight Line Tester For Cabin Temperature Control System. (Required For Test, On Md-90 & 717. Must Be Used With 4751004-1, Cabin Temp Tester) (Superceded By 3965776-501) by Mcdonnell Douglas.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.