While troubleshooting electrical faults on an M8E1 chemical biological protective shelter (CBPS), we found corrosion and standing water inside the external control panel (ECP).
ECP with corrosion
The PMCS chart in WP 122 of TM 10-5410-285-23&P-1 (Mar 18) states that the gas particulate filter unit (GPFU) and ECP are to be checked quarterly or every 125 hours for excessive corrosion and standing water.
The TM also states that the power distribution box (PDB) has to be inspected semi-annually or every 250 hours for excessive corrosion and standing water or damage that prevents system operation.
Maintainers should also remove the panel covers periodically to inspect the panel seals and check for water damage to electrical components. Make it a habit to clean and dry the panel when needed. This will help the panel to stay in good shape and it won’t need to be replaced often.
The control panel and other CBPS parts have a long lead time, which can leave the equipment NMC and shut down for a while. So it’s critical to keep them clean and dry and conduct PMCS per the TM.
Mr. Bill Tipton
Ft Hood, TX
Editor’s note: Thanks for this PMCS tip that helps resolve this ongoing problem of water intrusion on the CBPS’s water panel.
Video showing water buildup