ETL 1110-3-498
24 Feb 99
Table F-4
Single-Stage Airlock Processing Procedures
Item
Description
1
Before entering the airlock, ensure that air is being discharged from the purge vents.
2
Look through the view window to ensure that the first stage is not occupied. If
unoccupied, enter the airlock.
3
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-
1).
4
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.
5
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.
F-7
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