TM 10-5410-228-24
8.
NBC FAN `PRESSURE LOW' INDICATOR DOES NOT COME ON AND AUDIBLE ALARM DOES
NOT SOUND WHEN NBC FAN SWITCH IS FIRST TURNED ON MUTE SWITCH OFF, `NBC FAN
ON' INDICATOR ON.
Press ALARM MUTE switch.
Observe ALARM MUTE indicator.
No
Is indicator on (blue)?
Yes
Turn ECV OFF.
Tag power panel and cab area.
Gain access to cover assembly
components (see para 2.13.23).
Remove connector from NBC
SHELTER PRESSURE gauge.
Test for continuity between pins H and J
on gauge.
No
Replace NBC SHELTER
Does continuity exist?
PRESSURE gauge.
Yes
2
1
A
B
J
K
H
C
F
D
E
REAR VIEW OF GAUGE