3003 W CASINO RD PAINT HANGAR BOUNDARIES 2023-07-20

Geminus Boeing Project Contract No.EVE-16-2929 Technology Development CEI Project No. 160731 decorative paint. Other paint mixes were not tested because they were all included in the Run 3 parameters. o Note: The "b" designation for this simulation was to reflect modifications to the initial exhaust distribution, following evaluation of the overspray clouds from initial simulations that included an earlier exhaust distribution (Case 2, Scenario 1). The previous 45-03 CFD Case 2 Analyses [2] consisted of a few other scenarios that were not performed for the 45-04 since the building geometry, air supplies/exhausts, and fan systems are very similar. These consisted of: • Fuselage only paint mode @ 75% airflow: This was not included since the lack of engine painting did not modify the over-spray clouds on the fuselage and vertical stabilizer • Power failure during paint mode at 75% airflow: The 45-03 analyses concluded that the paint guns would turn off very quickly after a power outage (within 5 seconds) while the air supply and exhaust fans would continue to provide air for up to 4 minutes after power loss due to their momentum (a linear spin down rate was recorded during spin-down tests). Time accurate 45-03 CFD analyses showed that at no point was there any additional build-up of over-spray in the 45- 03 paint hangar since the supply/exhaust fans were at —98% of their pre-power outage airflows when the paint guns turned off, thus not affecting any of the airflow in the hangar. i.e., the characteristic time scale to circulate the airflow and locally dilute the overspray during the paint gun turn-off delay were very much smaller than the timescale for the airflow to significantly reduce during the supply and exhaust fans spin down. The 45-04 has a similar air supply system. Boeing has specified four scenarios of interest for Case 3 analysis: • Case 3, Scenario lb (C3/S1b): 777x aircraft with the Run 3 spray gun conditions being applied to the fuselage, mid-wing top, and mid-horizontal stabilizer top, ventilation in 75% air flow mode (75% flow rate of Paint Mode). • Case 3, Scenario 2b (C3/S2b): 777x aircraft with the Run 3 spray gun conditions being applied to the fuselage, wing tip top, and mid-horizontal stabilizer top, ventilation in 75% air flow mode (75% flow rate of Paint Mode). • Case 3, Scenario 3b (C3/S3b): 777x aircraft with the Run 3 spray gun conditions being applied to the fuselage, mid-wing bottom, and mid-horizontal stabilizer bottom, ventilation in 75% air flow mode (75% flow rate of Paint Mode). • Case 3, Scenario 4b (C3/S4b): 777x aircraft with the Run 3 spray gun conditions being applied to the fuselage, wing tip bottom, and mid-horizontal stabilizer bottom, ventilation in 75% air flow mode (75% flow rate of Paint Mode). 7