Airworthiness Directive 2021-23-16
one-timeAirworthiness Directives; Pacific Aerospace Limited Airplanes
What this AD requires
The FAA is adopting a new airworthiness directive (AD) for certain Pacific Aerospace Limited Model 750XL airplanes. This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as chafing of the engine fuel feed line hoses. This AD requires inspecting the engine fuel feed line hoses and the electrical wiring and rerouting all fuel lines. The FAA is issuing this AD to address the unsafe condition on these products.
Which aircraft AD 2021-23-16 applies to
Applies to airplanes fitted with an air conditioner and/or a standby alternator, including airplanes configured for installation of an air conditioner and/or a standby alternator, as shown in Figure 1 of Part A in Pacific Aerospace Mandatory Service Bulletin PACSB/XL/113, Issue 2, dated March 8, 2019.
Whether AD 2021-23-16 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.