24 Feb 99
Single-Stage Airlock Processing Procedures
Before entering the airlock, ensure that air is being discharged from the purge vents.
Look through the view window to ensure that the first stage is not occupied. If
unoccupied, enter the airlock.
After entering the airlock, remove any items left from the previous in-processing
group. Remove outer garments and put them in the trash bag or clothing chute
provided. Set the timer for a 3-minute dwell time (or as determined by equation C-
When the dwell time is complete, personnel in the toxic-free area should check the
airlock with a chemical agent monitor to ensure that the contaminants have been
sufficiently removed. After the airlock has been checked and no contaminants have
been detected, proceed to the toxic-free area.
After entering the second stage, set the timer for a 4-minute purge time. After the 4
minutes have elapsed, hold your breath, remove your mask, and enter the TFA.
Depending on user requirements, the mask is either placed in a mask bag, sealed, and
taken into the shelter for use during an emergency or the mask is left in the airlock
and removed by the next processing group.