Article 17 Aircraft, engine and propeller log books
In addition to any other log books required by or under this Order, the following log books shall be kept in respect of aircraft registered in the United Kingdom:
an aircraft log book;
a separate log book in respect of each engine fitted in the aircraft; and
a separate log book in respect of each variable pitch propeller fitted to the aircraft.
The log books shall include the particulars respectively specified in Schedule 6 to this Order and in the case of an aircraft having a maximum total weight authorised not exceeding 2730 kg shall be of a type approved by the CAA.
Each entry in the log book, other than such an entry as is referred to in sub-paragraphs 2(d)(ii) or 3(d)(ii) of Schedule 6 to this Order, shall be made as soon as practicable after the occurrence to which it relates, but in no event more than 7 days after the expiration of the certificate of maintenance review (if any) in force in respect of the aircraft at the time of the occurrence.
Each entry in the log book, being such an entry as is referred to in sub-paragraphs 2(d)(ii) or 3(d)(ii) of Schedule 6 to this Order shall be made upon each occasion that any maintenance, overhaul, repair, replacement, modification or inspection is undertaken on the engine or propeller, as the case may be.
Any document which is incorporated by reference in a log book shall be deemed, for the purposes of this Order, to be part of the log book.
It shall be the duty of the operator of every aircraft in respect of which log books are required to be kept as aforesaid to keep them or cause them to be kept in accordance with the foregoing provisions of this article.
Subject to article 80 of this Order every log book shall be preserved by the operator of the aircraft until a date 2 years after the aircraft, the engine or the variable pitch propeller, as the case may be, has been destroyed or has been permanently withdrawn from use.