H-II Transfer Vehicle KOUNOTORI (HTV)

KOUNOTORI4 Mission Timeline

In-Flight Schedule

HTV4 Mission Timeline

Flight Day	Major mission events
FD1	Launch, Orbit Insertion Post-insertion auto sequence HTV subsystem activations Attitude control System check Tracking and Data Relay Satellite (TDRS) communications establishment Initiation of communication with HTV Mission Control Room (HTV MCR) at Tsukuba Space Center Rendezvous Maneuver
FD1 to FD6	Far-field Rendezvous Maneuvers
FD6 to FD7	Proximity Operations Final Approach Capture by the Space Station Remote Manipulator System (SSRMS) Berthing to ISS Berth to the Harmony's Nadir Port Vestibule outfitting Activation of HTV power supply from ISS Switching of the communications line Crew ingress to the Pressurized Logistics Carrier (PLC) Removal of the Controller Panel Assemblies (CPAs) HTV PLC hatch open Activation of the Inter-Module Ventilation (IMV) Transfer of the Portable Breathing Apparatus (PBA), and the Portable Fire Extinguisher (PFE) in the PLC
After FD8	Cargo Transfer From PLC to ISS
FD8	Move of the Exposed Pallet (EP) from the HTV Unpressurized Logistics Carrier (ULC) to the Kibo's Exposed Facility (EF)
-	Transfer of NASA's payload Space Test Program - Houston 4 (STP-H4) and system hardware from EP
-	Transfer of STP-H3 to EP for disposal
FD25	Reinstallation of EP into ULC
-	Cargo Transfer from PLC to ISS Trash Loading from ISS to PLC
One Day Before Unberthing	Unberthing Preparation Removal of lights, PFEs, and PBAs (all to be stowed on ISS) installation of CPA on the CBM Deactivation of the IMV Hatch closure Switching of the communications line
Unberthing Day	KOUNOTORI4 Unberthing, Separation from ISS Deactivation of HTV power supply from ISS Vestibule de-outfitting KOUNOTORI4 grapples by the SSRMS CBM bolts release SSRMS moves KOUNOTORI4 to release position Activation of the Guidance Navigation Control (GNC), activation of HTV propulsion system SSRMS ungrapples KOUNOTORI4 KOUNOTORI4 begins separation maneuvers
Reentry Day	De-orbit Maneuver Fiery Reentry

* In-flight schedule of the HTV4 mission is subject to change depending on the ISS's operations timeline.
* Pictures used in the table are taken during the previous HTV missions. Some of them are Computer Graphics (CG) images.