FAA Order 8130.2M — Operating Limitation 49
Appendix D · Table D-1 · p. p189
Phase I: During Phase I flight, all operations must be conducted under day visual meteorological conditions and over an area compliant with § 91.305 until it is shown that the aircraft is controllable throughout its normal range of speeds and throughout all the maneuvers to be executed, and the aircraft has no hazardous operating characteristics or design features. Document compliance with § 91.319(b)(1) and (2) in the maintenance records.
Verify it yourself: the eyeball above opens the exact page of Order 8130.2M with this limitation highlighted.