(6) Special transition rules (A) Schedule for reviews of transition orders (i) Initiation The administering authority shall begin its review of transition orders in the 42d calendar month after the date such orders are issued. A review of all transition orders shall be initiated not later than the 5th anniversary after the date such orders are issued. (ii) Completion A review of a transition order shall be completed not later than 18 months after the date such review is initiated. Reviews of all transition orders shall be completed not later than 18 months after the 5th anniversary of the date such orders are issued. (iii) Subsequent reviews The time limits set forth in clauses (i) and (ii) shall be applied to all subsequent 5-year reviews of transition orders by substituting “date of the determination to continue such orders” for “date such orders are issued”. (iv) Revocation and termination No transition order may be revoked under this subsection before the date that is 5 years after the date the WTO Agreement enters into force with respect to the United States. (B) Sequence of transition reviews The administering authority, in consultation with the Commission, shall determine such sequence of review of transition orders as it deems appropriate to promote administrative efficiency. To the extent practicable, older orders shall be reviewed first. (C) “Transition order” defined For purposes of this section, the term “transition order” means— (i) a countervailing duty order under this subtitle or under section 1303 1 of this title, (ii) an antidumping duty order under this subtitle or a finding under the Antidumping Act, 1921, or (iii) a suspension of an investigation under section 1671c or 1673c of this title , which is in effect on the date the WTO Agreement enters into force with respect to the United States. (D) Issue date for transition orders For purposes of this subsection, a transition order shall be treated as issued on the date the WTO Agreement enters into force with respect to the United States, if such order is based on an investigation conducted by both the administering authority and the Commission.