The mission was scheduled to launch on May 1, 2014. The launch was delayed to no sooner than May 6, 2014, then to NET June 17, then to NET July 1, again to NET July 10, again to NET July 11 due to test stand failure of an AJ-26 engine, to NET July 12 due to local weather, and finally to NET July 13, 2014, again due to weather. Orb-2 berthing to the ISS will follow about 3 days later on July 15. The Cygnus is expected to deliver 1,650 kilograms (3,630 lb) of cargo to ISS and dispose of about 1,470 kilograms (3,250 lb) of trash through destructive reentry.
Flight Day 1 (Launch):After a 10-minute flight sequence, Antares will launch Cygnus into orbit on the same plane as the space station, but significantly below it. Cygnus will deploy its solar arrays after separation from Antares. After a series of checks, ground controllers will command Cygnus to begin increasing its altitude.
Flight Days 2 & 3: Cygnus will continue to increase its altitude to match that of the space station.
Flight Day 4: NASA will make a go/no-go decision for Cygnus to berth with the station. Cygnus will first autonomously approach within 12 metres (39 ft) below the space station, where it will stop and hold. Astronauts aboard the station will then command Cygnus to a “free drift” mode, where they will then capture it with the station's robotic arm attached to the station's Nadir node.
Flight Day 5 to Day 36: ISS Astronauts will open Cygnus’ hatch, unload the payload and fill it with disposal cargo.
Flight Day 36 through Day 41 Cygnus will be detached from the station and maneuvered a safe distance away. Engineering tests may be conducted for up to 15 days before a series of engine burns are conducted to slow the spacecraft for reentry over the South Pacific Ocean, where it and the cargo inside will be destroyed.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).