The final launch of Space Shuttle Endeavour has been rescheduled for no earlier than May 16 to give technicians more time to address electrical problems that forced NASA to scrub an April 29 launch attempt.

NASA managers set the new launch target May 6 following a meeting to review progress on the repairs. The primary purpose of Endeavour’s mission is to deliver a load of spare parts to the international space station and install the Alpha Magnetic Spectrometer, a $2 billion particle physics experiment.