# 13.53 Discovery.(a) *Filing.* Discovery requests and responses are not filed with the FAA Hearing Docket unless in support of a motion, offered for impeachment, or other permissible circumstances as approved by the hearing officer.(b) *Scope of discovery.* Any party may discover any matter that is not privileged and is relevant to any party's claim or defense.(c) *Time for response to written discovery requests.* (1) Written discovery includes interrogatories, requests for admission or stipulations, and requests for production of documents.(2) Unless otherwise directed by the hearing officer, a party must serve its response to a discovery request no later than 30 days after service of the discovery request.(d) *Depositions.* After the respondent has filed a request for hearing and an answer, either party may take testimony by deposition.(e) *Limits on discovery.* The hearing officer may limit the frequency and extent of discovery upon a showing by a party that—(1) The discovery requested is cumulative or repetitious;(2) The discovery requested can be obtained from another less burdensome and more convenient source;(3) The party requesting the information has had ample opportunity to obtain the information through other discovery methods permitted under this section; or(4) The method or scope of discovery requested by the party is unduly burdensome or expensive.