The Minister for Defence has provided the following answer to the honourable senator's question:

HMAS Collinswasoperational during the period except between mid to end December 2010 undergoing a Certification Extension Docking.

HMAS Waller was operational during the period except between September and October 2010 undergoing an Intermediate Maintenance Activity.

HMAS Dechaineuxwas operational during the period except in December 2010 undergoing an Intermediate Maintenance Activity.

The term 'Tasking Ready Days' is not in use by the Royal Australian Navy.