CFI Instrument Practical Test Standards,
FAA-S-8081-9B, June 2001
II. Technical Subject Areas
D. Logbook Entries Related to Instrument Instruction
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4. Required flight instructor records (14 CFR 61.189)
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a. A flight instructor must sign the logbook of each person to whom that instructor has given flight training or ground training
b. A flight instructor must maintain a record in a logbook or a separate document that contains the following:
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1) The name of each person whose logbook or student pilot certificate that instructor has endorsed for solo flight privileges, and the date of the endorsement; and
2) The name of each person that instructor has endorsed for a knowledge test or practical test, and the record shall also indicate the kind of test, the date, and the results