The Lockheed P-3 Orion is a Lockheed made four engined aircaft with varitions such as the P-3K, P-3C, P-3As and more. Mostly used as Maritime patrol aircraft due to the probe located at the rear of the aircraft where you would find the APU on other Aircraft. The aircraft runs on Rolls Royce Allison T56-A-14 engine with Hamilton Standard 54H60-77 propeller.