The FAA requires notification of certain sUAS accidents. The applicable FAA regulation states:
§ 107.9 Accident Reporting. No later than 10 days after an operation that meets the criteria of either paragraph (a) or (b) of this section, a remote pilot in command must report to the Federal Aviation Administration in a manner acceptable to the Administrator, any operation of the small unmanned aircraft involving at least:
a. Serious injury to any person or any loss of consciousness; or
b. Damage to any property, other than the small unmanned aircraft, unless one of the following conditions is satisfied: 1.The cost of repair (including materials and labor) does not exceed $500; or
2. The fair market value of the property does not exceed $500 in the event of total loss.
This report is for small UAS accidents only. If you wish to report unsafe operation of an Unmanned Aircraft, please contact your FAA Regional Operations Center.
The questionnaire is a collection of information under the Paperwork Reduction Act of 1995. The Federal Aviation Administration will use the information you provide in response to the following questions to regulate and promote safety in air commerce, in accordance with its statutory authority 49 U.S.C § 44701. The following questions will take approximately 10 minutes to complete. You are not required to respond to this collection of information unless it displays a currently valid OMB control number.
(Link: https://www.faa.gov/uas/report_accident/)