21 C.F.R. § 213.180 – General requirements.

(a) Record availability. All records required under this part, or copies of such records, shall be readily available for authorized inspection during the retention period at the establishment where the activities described in such records occurred and are subject to copying as part of such inspection. Records that can be immediately retrieved from another location by computer or other electronic means shall be considered as meeting the requirements of this paragraph (a).
(b) Record requirements. All records must be legible, stored to prevent deterioration or loss, and original or accurate reproductions of the original records.
(c) Record retention period. Except where otherwise provided, all records required to be maintained in compliance with this part must be maintained for a period of at least 3 years after the distribution of the batch of medical gas.
(d) Maintenance of written records. Written records required by this part shall be maintained so that data therein can be used for evaluating, at least annually, the quality standards of each medical gas to determine the need for changes in specifications or manufacturing or control procedures. Written procedures shall be established and followed for such evaluations and shall include provisions for:
1. (1) A review of a representative number of batches, whether approved or rejected, and, where applicable, records associated with the batch; and
2. (2) A review of complaints, recalls, returned or salvaged medical gases, and investigations conducted under § 213.192 for each gas.
(e) Written procedure requirements. A firm shall establish and follow written procedures to assure that responsible officials of the firm are notified in writing of any recalls, reports of inspectional observations by FDA, regulatory actions related to good manufacturing practices brought by FDA, or investigations resulting from adverse event complaints.