No Aircraft
Maintenance Airframe; Maintenance Powerplant
Confusion
Aircraft Equipment Problem Less Severe
General Maintenance Action
Environment - Non Weather Related; Procedure
After watching a demo of fogging the aircraft for possible viruses with a new procedure I had noticed that the fog would enter into the forward and aft cabin temp sensor module. The fog is a wet fog that coats the surfaces to disinfect. The fog will easily enter the module that are in the PSUs. The power for these comes from your P6-4 power panel and controlled from your 115v AC bus that is still powered with your ground service bus. These Temp sensors have had issues in the past on all fleets with dirt and dust coating the sensor and giving false reading of cabin temp. Example; the pilot write up might say Aft cabin temp hot or cold this is due to the temp bulb dirty in most cases.  This is a procedure we are doing and we had talked about this to the others that were giving the demo of our concerns. Also with the smoke detectors in the cabin and cargo. There are similar systems on several aircraft types that operate in the same manner.   Either pull the circuit breaker in the systems before you spray the cargo or cabin or clean the sensors after spraying the cabin and or cargo in accordance with the manuals. This would avoid any delays to the aircraft departure and discomfort to our passengers and cabin crew members due to any delays or hot or cold cabin temps or false smoke warnings.
Technician reported that the residue film left from fogging the aircraft for COVID-19 may affect temperature sensors.