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The FAA does not issue a blanket "approval" for a specific laser wattage because their regulations are performance-based rather than equipment-based. Instead, the FAA allows the use of laser cleaning on 2024 and 7075 aluminum through specific regulatory pathways
THE "NO OBJECTION" PRECEDENT
In 2010, the FAA issued a formal "Letter of No Objection" regarding laser ablation for commercial aircraft. This was after extensive testing on flight-critical and load-bearing aluminum structures (wings and fuselages).
Significance: This set the precedent that pulsed lasers are a safe alternative to chemical stripping or abrasive blasting, provided they use closed-loop control (sensors that stop the laser the microsecond the paint is gone to prevent substrate heating).
FAA REGULATORY PATHWAYS (PART 43 & PART 145)
To use a 300W laser on an aircraft legally, you must satisfy the following FAA requirements:
AC 43.13-1B: This Advisory Circular covers "Acceptable Methods, Techniques, and Practices." While it doesn't explicitly name "laser," it allows for alternative cleaning methods if they do not cause "intergranular corrosion, pitting, or loss of cladding."
WHY 300W IS THE "SWEET SPOT" FOR FAA COMPLIANCE
A 300W pulsed laser is often easier to validate for FAA-regulated work than higher-power units (1000W+) because:
Thermal Control: It is much easier to keep the skin temperature below the 250°F (121°C) limit required to prevent the "over-aging" of 7075-T6 aluminum.
Alclad Protection: 300W allows for a more controlled ablation rate, reducing the risk of removing the protective pure-aluminum "Alclad" layer found on 2024-T3 skins.
SUMMARY OF "ALLOWED" STATUS: FAA COMPLIANCE
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