EASA AD US-2021-06-04
Fuselage - Floor Beam Support Link Lower Bushing - Inspection / Airworthiness Limitations Section Revision
Summary
The Federal Aviation Administration's Airworthiness Directive 2021-06-04 is a final rule addressing all Gulfstream Aerospace Corporation Model GV airplanes. It mandates inspections of the right butt line 6 floor beam inboard support links and bushings for corrosion to prevent potential failure. This directive responds to corrosion issues that could compromise the pressure vessel floor integrity and lead to loss of airplane pressurization.
What Changed
This new airworthiness directive introduces mandatory inspections of the floor beam support link lower bushings at specific fuselage stations (499, 531, and 569.5) on Gulfstream GV airplanes. It requires operators to perform detailed corrosion inspections within 24 months of the effective date and to revise the airworthiness limitations section of maintenance manuals accordingly. Unlike previous procedures, this AD does not require reporting inspection results to Gulfstream.
Why It Matters
This AD is critical for aviation professionals because corrosion-induced failure of floor beam support links can jeopardize the structural integrity of the aircraft's pressure vessel floor, risking cabin pressurization loss. Operators and maintenance teams must ensure compliance to maintain airworthiness and safety. The directive clarifies inspection requirements and removes ambiguity about reporting, aiding in regulatory compliance and risk mitigation.
What To Do
Operators of Gulfstream Model GV airplanes must inspect the right butt line 6 floor beam inboard support links at fuselage stations 499, 531, and 569.5 for corrosion within 24 months from May 4, 2021. If corrosion is found, the affected support link must be replaced before further flight using FAA-approved methods. Additionally, maintenance manuals or inspection programs must be updated to include these inspection requirements within the same timeframe.
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