Project Title

Time Access Service


Document Number


4.02 Application Support Services Working Group

Document Type


Description of Document

A specification for the onboard time access service that enables flight applications located on any node of the spacecraft to obtain the onboard time with bounded accuracy, and define the service interface used to access that service.

Applicable Patents

Patent Comments

Survey of Similar Standards
Documents or Projects
Undertaken in Other Bodies
and elsewhere in CCSDS


Book Editor

Book Editor Resources

Prototype 1

Prototype 1 Resources

Prototype 2

Prototype 2 Resources

Prototype 3

Prototype 3 Resources


Monitor Only

Resource Comments


Legend for Schedule Milestones
Orange Bullet = Required for Orange Books
Green Bullet = Required for Green Books
Magenta Bullet = Required for Magenta Books
Blue Bullet = Required for Blue Books
Note - Red Books are Draft Blue/Magenta Books

Schedule Milestones
Orange BookGreen BookMagenta BookBlue Book
Original Completion Date
(Date in M/D/YYYY format.)
(Date in M/D/YYYY format.)
Project ApprovedOrange BulletGreen BulletMagenta BulletBlue Bullet10/3/2002
Project Start DateOrange BulletGreen BulletMagenta BulletBlue Bullet
Internal WG Review
First Draft Circulated to WGOrange BulletGreen BulletMagenta BulletBlue Bullet11/6/2005
First Draft Comments DueOrange BulletGreen BulletMagenta BulletBlue Bullet12/31/2005
Second draft circulated to WGOrange BulletGreen BulletMagenta BulletBlue Bullet10/29/2006
Second Draft Comments DueOrange BulletGreen BulletMagenta BulletBlue Bullet12/31/2006
Final WB Submitted to AD for Further ProcessingOrange BulletGreen BulletMagenta BulletBlue Bullet1/18/2007
External Milestones
Secretariat Document ProcessingOrange BulletGreen BulletMagenta BulletBlue Bullet3/20/2007
First Agency ReviewMagenta BulletBlue Bullet9/13/2007
RID ResolutionMagenta BulletBlue Bullet3/31/2008
Secretariat Document Processing 2Magenta BulletBlue Bullet9/30/2009
Final Agency ReviewMagenta BulletBlue Bullet10/31/2009
RID ResolutionMagenta BulletBlue Bullet3/31/2010
First Prototype DevelopmentBlue Bullet9/30/2008
Second Prototype DevelopmentBlue Bullet9/30/2009
CMC ApprovalOrange BulletGreen BulletMagenta BulletBlue Bullet3/31/2010
Total Time to Complete
(in months)
Version: 21.0
Created at 11/4/2008 9:37 AM by Fowell Stuart
Last modified at 6/12/2011 2:36 PM by CCSDS Tech Support