188.8.131.52 Static Operation With Internal Power - Switchover From Non-NBC To NBC Conditions -
b. LMS Crew Tasks
(1) Put on chemically protective masks.
(2) Ensure that access door and emergency exit hatch are closed and latched.
(3) Press NBC FAN switch (1, figure 2-25) on rear control panel (2) to turn on NBC fan (NBC FAN
ON indicator lights green). NBC alarm buzzer (3) will sound and LOW PRES indicator on NBC
FAN switch (1) will light (red). Pressing NBC ALARM (press to mute) switch (4) will silence
NBC alarm buzzer (3) and ALARM MUTE indicator on NBC ALARM (press to mute) switch (4)
will light (blue). NBC fan will run until NBC SHELTER PRESSURE gage (5) registers 0.5 iwg.
When ABS has reached over pressure of 0.5 iwg on NBC SHELTER PRESSURE gage (5), press
NBC ALARM (press to mute) switch (4) to turn off alarm mute. ALARM MUTE indicator (blue
light) on NBC ALARM (press to mute) switch (10) will go off.
Ensure that fastener hook and fastener loop fasteners are engaged properly on inner
ambulatory airlock door and that side zipper is closed on inner TALP airlock door.
To protect against death from contamination, prior to performing next step, verify that NBC
SHELTER PRESSURE gage reads at least 0.5 iwg.
Under NBC conditions, inflated ABS should always be pressurized to at least 0.5 iwg.
Adjustment of over pressure inside ABS, TALP airlock and ambulatory airlock is
accomplished by opening flaps on inner and outer TALP and ambulatory airlock door vents.
TALP and ambulatory airlocks should be pressurized to 0.3 iwg.
Open vent holes on inner TALP and ambulatory airlock doors by adjusting or pulling back
fastener hook and fastener loop covers. Inner ambulatory airlock door and TALP airlock door
vents should be opened or closed to achieve an ABS over pressure of 0.5 iwg on NBC SHELTER
Outer TALP and ambulatory airlock door vents should be adjusted to achieve a pressure of 0.3
iwg within TALP and ambulatory airlock. Adjust outer ambulatory door vents and communicate
with cab crew to have them adjust outer TALP airlock door vents as necessary.
Allow TALP and ambulatory airlock to purge for approximately three minutes. Using Chemical
Agent Monitor (CAM), open side zipper on TALP airlock tunnel or fastener hook and fastener
loop tape on ambulatory airlock door partially to insert CAM probe. Check if airlock has purged
sufficiently. If contamination is present, remove CAM and close zipper or fastener hook and
fastener loop tape, and allow another minute or so to pass before performing another CAM
Both ambulatory and TALP entry areas serve as airlocks to prevent undue loss of pressure
when doors are opened and to provide a place for final decontamination of individuals who
are entering from a contaminated area. Most contaminants that penetrate are swept out by
enclosure are filtered by NBC recirculation air filters powered from receptacle panel.
Verify NBC recirculation filters (9 and 10, figure 2-17) are operating.