Airworthiness Directive 2000-07-27
one-timeAirworthiness Directives; Various Transport Category Airplanes Equipped With Certain Honeywell Air Data Inertial Reference Units
What this AD requires
This amendment adopts a new airworthiness directive (AD) that is applicable to various transport category airplanes equipped with certain Honeywell air data inertial reference units (ADIRU). This action requires inspection of a failed ADIRU to determine its modification status, and replacement of an unmodified failed ADIRU with a serviceable ADIRU. This action also provides for optional terminating action for the requirements of the AD. This amendment is prompted by reports of dual critical failures of inertial reference units on ADIRU's during flight. The actions specified in this AD are intended to prevent loss of the main sources of attitude data, consequent high pilot workload, and a significant increase in the likelihood of pilot error.
Which aircraft AD 2000-07-27 applies to
Applies to airplanes with a Honeywell Air Data Inertial Reference Unit (ADIRU) installed having P/N HG2030AD09 or HG2030AD10 (per Honeywell Alert SB HG2030AD-34-A0009), or P/N HG2050AC02, HG2050AC03, HG2050AC04, or HG2050AC05 (per Honeywell Alert SB HG2050AC-34-A0008), that is not marked with the required modification status (mod 3 or 6 for the HG2030AD units; mod 2 or 3 for the HG2050AC units), unless replaced with a marked unit or a serviceable unit with fewer than 7,000 accumulated operating hours. Addresses loss of main attitude data source following a critical inertial reference failure.
Whether AD 2000-07-27 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.