91.537 Inoperative instruments and equipment
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(a) An aircraft with inoperative instruments or equipment may be
operated if--
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(1) an MEL has been approved for the aircraft in accordance with
rule 91.539; and
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(2) the aircraft is certified for release-to-service with the inoperative
instruments or equipment in accordance with the requirements of
rule 43.107; and
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(3) the aircraft is operated in accordance with every applicable
condition and limitation contained in the MEL.
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(b) An aircraft that does not exceed 5700 kg MCTOW and does not have
a MEL approved under rule 91.539 may be operated under this Part with
inoperative instruments and equipment if--
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(1) the inoperative instruments and equipment are--
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(i) not instruments and equipment prescribed for VFR day
certification in the applicable airworthiness requirements
under which the aircraft was type certificated; and
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(ii) not required by this Subpart for specific operations; and
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(iii) not required by an airworthiness directive to be in
operable condition; and
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(2) the aircraft is certified for release-to-service with the inoperative
instruments or equipment in accordance with the requirements of
rule 43.107.
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(c) An aircraft that does not meet the requirements of
paragraphs (a) or (b) may be operated with inoperative instruments and
equipment if a special flight permit has been issued in respect of the aircraft
in accordance with Subpart I of Part 21.