The HOP has been identified as a novel and useful platform that will play a key role in BEACHON, and under the leadership of Dr. Alex Gunther (at TIIMES), we have started the design of an “Atmospheric Chemistry Package” (ACP) that will be mounted on the HOP for BEACHON. This ACP includes sensors and instruments to measure ozone and NO/NO2/NOy concentrations, total number of particles larger than 10 nm, size distribution of particles larger than 100 nm, VOC, direct and diffuse PAR and to measure the fluxes of ozone, NO/NO2/NOy, VOC (using REA and a PTR-MS), and particles. The PTR-MS will be mounted in a pod under the belly of the HOP, using the same quick-release attachment device and power and data connectors used for the LIDAR currently being mounted on it. All other components will be mounted on a rack in the front cabin, with an inlet that will go straight through the front frame of the HOP to sample undisturbed air next to the AIMMS-20 and instead of the Licor, which will be moved to the side of the attachment device.