Sun, Aug 23, 2020
AD 2020-16-20 Due To Incorrectly Marked And Annunciated Low Oil-Pressure Indication Warnings
The FAA is superseding Airworthiness Directive (AD) AD 2018-04-09 for Pacific Aerospace Limited Model 750XL airplanes.
This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as incorrectly marked and annunciated low oil-pressure indication warnings. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective September 22, 2020.
Supplementary Information: The FAA issued a supplemental notice of proposed rulemaking (SNPRM) to amend 14 CFR part 39 by removing AD 2018-04-09, Amendment 39-19205 (83 FR 9793, March 8, 2018) (AD 2018-04-09) and adding a new AD. AD 2018-04-09 applied to Pacific Aerospace Limited Model 750XL airplanes and was based on MCAI issued by the Civil Aviation Authority (CAA), which is the aviation authority for New Zealand. The SNPRM published in the Federal Register on June 10, 2019 (84 FR 26775). The FAA preceded the SNPRM with a notice of proposed rulemaking (NPRM) that published in the Federal Register on October 23, 2018 (83 FR 53409).
The NPRM proposed to require revising the existing airplane flight manual (AFM) (pilot's operating handbook (POH)) with updated provisions, clarify that the pressure switch for the low oil pressure light may be replaced or modified, and retain the requirement to replace the oil pressure/temperature indicator. The NPRM was based on the CAA's revision to its previous MCAI, CAA AD DCA/750XL/19A, dated April 26, 2018 (referred to after this as “the MCAI”), to mandate the AFM revisions and also to include an option to modify certain oil pressure switches. The MCAI states: DCA/750XL/19A revised to introduce revision 30 March 2018 for PAL 750XL POH AIR3237, and clarify the AD requirements.
After issuing the NPRM, the FAA discovered an error in the title of one of the flight manuals to be revised. The SNPRM proposed to correct the error. The FAA is issuing this AD to require new revisions of the existing AFM, clarify the requirement to replace or modify the pressure switch for the low oil pressure light, and retain the requirement to replace a certain oil pressure/temperature indicator.
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