Current Navy sub hunter. In the process of being replaced by the P-8A Poseidon, the Orion still has many years of service remaining. As a Mechanical Designer in a previous life, I had designed a small Printed Circuit Board for the Update II version of this aircraft. This aircraft has been flying since the early 1960's and with constant updates, still thrives today. The airframes, basic Lockheed Electra, has not been produced in many years, are getting old.