Maintenance responsibilities
128.—(1)  An AOC holder must ensure that every large aeroplane that is registered in Singapore is maintained by —
(a)the AOC holder’s own maintenance organisation that is approved by the Director‑General of Civil Aviation in accordance with the Air Navigation Order; or
(b)an external organisation contracted under a formal maintenance support contract acceptable to the Director‑General of Civil Aviation.
(2)  Despite paragraph (1), the line maintenance for a Singapore registered large aeroplane may be carried out by a member of the AOC holder’s operations personnel if —
(a)the line maintenance does not require the use of complex tools or equipment that requires extensive setting up, or specialised training; and
(b)the scope of such line maintenance is specified in the AOC holder’s Maintenance Control Manual.
(3)  An AOC holder that, as described in paragraph (1)(b), contracts an external organisation to perform all or part of the maintenance of its Singapore registered large aeroplanes must ensure that the contracted external organisation complies with the maintenance requirements of the Air Navigation Order.
(4)  An AOC holder must ensure that every large aeroplane that is not registered in Singapore is maintained under an arrangement acceptable to both the Director‑General of Civil Aviation and the aeroplane’s State of Registry.
(5)  An AOC holder must not operate a foreign registered large aeroplane unless that aeroplane has been maintained and released to service under a system acceptable to the aeroplane’s State of Registry.