The Lockheed P-3 Orion
is a patrol aircraft
of the United States military
used primarily for anti-submarine warfare
P-3 Orion of the US Navy.
The first production version, designated P3V-1, first flew 15 April 1961, but by the time the first deliveries were made in 1962, the unified designation system made this the P-3.
Over the years, many variants have been developed.
The P-3 Orion has found special use as an earth-science suborbital research platform for NASA. Known as callsign; NASA 426, this aircraft is located at Goddard Space Flight Center's Wallops Island Flight Facility, Virginia.
- P-3A: original production version, 157 built
- P-3A (CS): four with better radar, for US Customs
- EP-3A: seven modified for electronic reconnaissance testing
- NP-3A: three modified for US Naval Research Laboratory
- RP-3A: two modified for scientific uses, for Oceanographic Development Squadron at NAS Patuxent River
- TP-3A: 12 modified for training, ASW gear removed
- UP-3A: 38 used as utility transports, ASW gear removed
- VP-3A: three WP-3As and two P-3As converted into VIP, staff transports
- WP-3A: four converted for weather reconnaissance
- Update I
- Update II
- Update II.5
- Update III
- Update IV
- EP-3E Aries
- EP-3E Aries II
- EP-3J': two modified from P-3A's for FEWSG use
- P-3K: five delivered to New Zealand
- CP-140 Aurora
- CP-140A Arcturus