(a) such spare parts are renovated pursuant to standard of good workmanship and good industry practice:
(b) the refurbished or renovated part being compliance with the applicable requirements of the contractor’s document
(c ) the spare parts being used to replace parts installed in a WTG shall be of the type prescribed by the contractor’s documents, or of the type being replaced, or of another type insofar as same does not invalidate the type certification of the WTG; and
(d ) without prejudice to the contractor’s obligation to ensure that sub paragraph (a) to (c ) aer complied with , the employer (acting reasonably) consent to the use of such refurbished spare parts. The employer may object to the use of any refurbished parts if, in tis reasonable opinion, such refurbished parts do not comply with sub paragraphs (a) to (c) above