H-II Transfer Vehicle KOUNOTORI (HTV)

HTV2 Mission Timeline

Vehicle Processing / Launch Preparation Phase

HTV2 Mission Vehicle Processing / Launch Preparation

In-Flight Phase

During the HTV2 Mission, the Space Shuttle Discovery (STS-133) will arrive at the International Space Station (ISS).

Before Discovery arrives at the ISS, the HTV2 will have to be relocated to the zenith port of Harmony to make clearance for the robotic operations by the SSRMS (such as removal of the STS-133 mission payloads from the shuttle's cargo bay). The HTV2 will be returned to the nadir port of Harmony after Discovery undocks from the ISS.

HTV2 Mission Timeline

Flight Day (FD*)	Major Objectives
FD1	Launch/Orbit Insertion Post-insertion Auto Sequence (HTV Subsystem Activations, Attitude Control, Self-Check, TDRS Communications Establishment, Initiation of Communication with HTV Mission Control Room (HTV MCR)) Rendezvous Maneuver
FD2 to FD5	Far-field Rendezvous Maneuvers
FD6	Proximity Operations Final Approach Capture by the SSRMS Berth to the Harmony’s Nadir Port CBM leak check Vestibule outfitting (Cable connections between the HTV2 and the nadir port of Harmony, activation of Inter Module Ventilation (IMV) etc.)
FD7	Crew Ingress Deployment of the Portable Breathing Apparatus (PBA) and the Portable Fire Extinguisher (PFE) in the PLC
FD10	Cargo Transfer (From the PLC to the ISS) Trash Loading (From the ISS to the PLC)
	HTV Removal of the Exposed Pallet (EP) from the HTV Unpressurized Logistics Carrier (ULC) Temporary Installation of the EP on Kibo's Exposed Facility (EF)
FD11 to FD16	Transfer of the FHRC and CTC from the EP to temporary installation locations using DEXTER (Special Purpose Dexterous Manipulator: SPDM)
FD17	Reinstallation of the EP into the ULC
FD28	HTV Relocation (Preparation for Arrival of STS-133) Vestibule deoutfitting (Preparation for unberthing of the HTV from the CBM at the nadir port of Harmony Relocation of HTV2 (to the zenith port of Harmony) CBM leak check Vestibule outfitting (Cable connections between the HTV2 and the zenith port of Harmony, activation of Inter Module Ventilation (IMV) etc.)
FD45	HTV Relocation (After STS-133 Departed from the ISS) Vestibule deoutfitting (Preparation for unberthing of the HTV from the CBM at the zenith port of Harmony Relocation of HTV2 (to the nadir port of Harmony) CBM leak check Vestibule outfitting (Cable connections between the HTV2 and the zenith port of Harmony, activation of Inter Module Ventilation (IMV) etc.)
After FD46	Cargo Transfer from the PLC to the ISS Trash Loading from the ISS to the PLC
The Day Before Unberthing	HTV Unberthing Preparation Removal of lights, smoke detectors, PFEs, and PBAs (to stow them on the ISS for reuse purpose) Installation of the Controller Panel Assemblies (CPAs) Hatch closure, cable de-mate Deactivation of the IMV
HTV Unberthing	HTV Unberthing/Separation from the ISS SSRMS grapples the HTV2 CBM bolts release SSRMS moves the HTV2 to release position Activation of the GNC, activation of HTV propulsion system SSRMS ungrapples the HTV2, HTV2 begins separation maneuvers
HTV Reentry (Two-day Operations)	De-orbit Maneuver Reentry

*: A day begins with ISS crew wake-up

The above schedule may vary depending on the ISS’s operations timeline.
Pictures used in the table are taken during the HTV1 Mission. Some of them are Computer Graphics (CG) images.

[Acronym]
Tracking and Data Relay Satellite: TDRS
Inter-Module Ventilation: IMV
Portable Breathing Apparatus: PBA
Cargo Transport Container: CTC
Flex Hose Rotary Coupler: FHRC
Control Panel Assembly: CPA
Guidance Navigation and Control: GNC