Are the student solo endorsements a “package deal” with that one specific instructor? If someone receives a student who’s completed his old instructor’s pre written solo exam and received an endorsement, do I need to give him my solo test and endorsement?
Or go ahead and complete the flight training/proficiency and 90 day endorsement?
My understanding is that it’s a &quot;package deal&quot;, one instructor must do it all. Except the XC pre-flight planning preparation endorsement, and this one can be given by any instructor.
Can someone confirm this? With possible quotes from FAR, ACs or interpretations.
The FAR's don't talk about whether or not a CFI can accept another instructor's solo endorsement. If the student has the endorsement, the 90 day period has not expired, and the make and model of the aircraft in the endorsement matches, then the student is technically good to go.

That said, a good CFI would carefully review the student's log book and, if necessary, require additional instruction/review before the allows the flight school to rent the student an aircraft. The relevant FAR is 61.87.