TABLE 2.

Troubleshooting table.

Device	Step	Problem	Possible reason	Solution
Standard FP device	1,19	Inconsistency between pressure curves and injury severity	Presence of air in reservoir	Level the cylindrical reservoir and open a valve centered on the top of the reservoir to remove trapped air Introduce saline from the side that is connected to the transducer tube to remove trapped air Check the operation of the device to ensure removal of air
MFP device	1,19	Inconsistency between pressure curves and injury severity	Presence of air in pressure chamber	Using the locking swivel attached to the base of pressure chamber, tilt the chamber after opening the valves on top and bottom Introduce saline from the bottom of the chamber, removing air through the valve on the top Close the valve immediately Check operation of the device several times to ensure the removal of air from the system

Air entrapment in the cylindrical reservoir (standard FP device) or the pressure chamber (MFP device) can result in inconsistency between pressure curves and degrees of injury severity. The trapped air must be removed to ensure reliability and reproducibility of injury across animals.