Command Pilot: Alan Poindexter (Second Space Flight)
Pilot: James Dutton (First Space Flight)
Mission Specialist 1: Richard Mastracchio (Third Space Flight EV1)
Mission Specialist 2: Dorothy M. Metcalf-Lindenburger (First Space Flight) Flight Engineer/Intra-vehicular Officer
Mission Specialist 3: Stephanie Wilson (Third Space Flight)
Lead Robotics Officer
Mission Specialist 4: Naoko Yamazaki, JAXA (First Space Flight)
Loadmaster
Mission Specialist 5: Clayton Anderson (Second Space Flight EV2)

S-131 (ISS assembly flight 19A) was a NASA Space Shuttle mission to the International Space Station (ISS). Space Shuttle Discoverylaunched on 5 April 2010 at 6:21 am from Kennedy Space Centre's's launch pad 39-A, and landed at 9:08 am on 20 April 2010 on runway 33 at the Kennedy Space Center's Shuttle Landing Facility. The mission marked the longest flight for space shuttle Discovery.
The primary payload was a Multi-purpose Logistics Module loaded with supplies and equipment for the International Space Station. The mission also removed and replaced an ammonia tank assembly outside the station on the S1 truss. STS-131 furthermore carried several on-board payloads; this mission had the most payloads since STS-107.
This was the final Space Shuttle mission with a seven person crew