Following a fire and actuation of the engine room fire suppression system, the
engine room may contain a dangerous level of Hydrogen Fluoride (HF) gas, which
is dangerous to humans. Do not reenter the engine room until the post-fire re-
entry procedure has been performed. Death or serious injury can result from
unprotected entry into this space prior to completion of the post-fire reentry pro-
1. Wait at least 15 minutes after extinguishing the fire before performing this procedure. The natural decay rate
for Hydrogen Fluoride (HF) gas is approximately 15 minutes after a fire is extinguished.
2. Perform HF gas sampling as follows:
a. Remove the cap (figure 2, item 2) from the aft HF sampling port (figure 2, item 3) located in the main deck
vestibule or the forward HF sampling port (figure 9, item 2) located in the damage control locker.
b. Zero the stroke counter (figure 12, item 1).
Install the rubber hose (figure 12, item 2) on the pump by sliding one end of the rubber hose over the tube
holder (figure 12, item 3).
d. Break off both tips (figure 12, item 4) of the detector tube (figure 12, item 5) using the breaker (figure 12,
item 6) on the sampling pump (figure 12, item 7).
Figure 12. Sampling Pump