ति च

Operational rule vidhi

उ is substituted for the vowel of चर् and फल् before an affix beginning with त्.

Word by word (padaccheda)

Right context ति saptamī · ekavacanaIndeclinable च avyaya

Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

ति च

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

उ is substituted for the vowel of चर् and फल् before an affix beginning with त्।
Thus चूर्तिः (= चरणं or ब्रह्मणः), प्रफुल्तिः and प्रफुल्ताः ॥ The anuvritti of यङ् लुकोरभ्यासस्य does not apply here, though present. See 8.2.55.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.