Each certificate holder who sells a United States registered aircraft shall transfer to the purchaser, at the time of the sale, the following records of that aircraft, in plain language form or in coded form which provides for the preservation and retrieval of information in a manner acceptable to the Administrator:
(a) The records specified in Sec. 135.439(a)(2).
(b) The records specified in Sec. 135.439(a)(1) which are not included in the records covered by paragraph (a) of this section, except that the purchaser may allow the seller to keep physical custody of such records. However, custody of records by the seller does not relieve the purchaser of its responsibility under Sec. 135.439(c) to make the records available for inspection by the Administrator or any representative of the National Transportation Safety Board.