Inoperative instruments and equipment
81.—(1)  Subject to paragraphs (2) and (3), an AOC holder must not commence any flight of a large aeroplane if any instrument or item of equipment that the aeroplane is required under these Regulations to be carried on the aeroplane in the circumstances of the intended flight is not carried or is not in a fit condition for use.
(2)  The Director‑General of Civil Aviation may, subject to such conditions as the Director‑General of Civil Aviation thinks fit, permit an AOC holder to operate a particular large aeroplane in specific circumstances even if the aeroplane does not carry a required instrument or item of equipment or that instrument or item of equipment is not in a fit condition for use.
(3)  Where a permission is granted under paragraph (2), the AOC holder may operate the specified large aeroplane in the circumstances specified in the permission if —
(a)the AOC holder has provided the particulars of the permission to the pilot‑in‑command of the aeroplane;
(b)the pilot‑in‑command has reviewed the particulars of the permission and determined that compliance with regulation 24 of the Air Navigation (91 — General Operating Rules) Regulations 2018 is possible; and
(c)every inoperative instrument or item of equipment is conspicuously marked “Inoperative” and the details of its required maintenance is recorded in the technical log.
(4)  To avoid doubt, a permission granted under paragraph (2) in respect of a foreign registered aeroplane does not affect the AOC holder’s responsibility to comply with the airworthiness requirements of the State of Registry.
(5)  Where an exit door of a large aeroplane becomes inoperative at a place where repairing or replacing the exit door is not reasonably practicable, the AOC holder may permit the aeroplane to continue carrying passengers until the aeroplane lands at a place where the exit door can be repaired if all of the following conditions are met:
(a)the total number of inoperative exit doors does not exceed one, or such number approved by the Director‑General of Civil Aviation;
(b)the conditions of flight are in accordance with arrangements approved by the Director‑General of Civil Aviation either in relation to the particular aeroplane or to the class to which that aeroplane belongs in respect of —
(i)the number of passengers carried;
(ii)the position of the seats which the passengers occupy;
(iii)the fastening of the exit door by locking or otherwise;
(iv)the covering of the words “Exit” or “Emergency Exit” or an equivalent symbol above the inoperative exit door; and
(v)the conspicuously marking of the exit by appropriate means to indicate that it is inoperative.