Final answer:
The records that must be made of a 100-hr inspection before an aircraft is approved for return to service include a logbook entry, updated manuals, and necessary forms or certificates.
Step-by-step explanation:
100-hr inspection records
that must be made before an aircraft is approved for return to service include a detailed logbook entry documenting the inspection, any repairs or replacements performed, and the signature of the mechanic who conducted the inspection. Additionally, any applicable maintenance manuals or instructions must be updated with the inspection results. Finally, any necessary forms or certificates provided by regulatory bodies should be completed and kept with the aircraft's records.