ITEM
INTERVAL
ITEM
TO BE
PROCEDURES
CHECK FOR AND HAVE
REPAIRED OR ADJUSTED
EQUIPMENT
IS NOT READY
NO.
B D A
D W M Q S
A
INSPECTED
AS NECESSARY
AVAILABLE IF
TM 55-1930-209-14&P-17
Table C-1. Preventive Maintenance Checks and Services ;or Workboat, Lifesaving,
and Firefighting Systems (Continued)
B - Before
D - Daily
Q - Quarterly
D - During
W - Weekly
S - Semiannually
A - After
M - Monthly
A - Annually
p.
Test for air leaks between the cylinder
Leaks exist
and the regulator outlet by observing
between cylinder
changes in gauge pressure. First, open
and regulator
both cylinder and main-line regulator
outlet.
valves and note the indicated regulator
pressure (blocking the breathing tube
outlet on pressure demand units).
q
After observing the regulator pressure,
Indicator drops
close the cylinder valve and watch the
more than 100
regulator pressure gauge. If the indicator
psig in 30 sec-
drops more than 100 psig in 30 seconds,
onds.
leaks are present. They may be located
by applying soapy water to connections
and couplings. Expanding bubbles indi-
cate leaks. Close mainline valve to con-
serve air supply.
r.
Check the Audi-Larm Function by
Alarm
observing the regulator gauge pressure
inoperable.
at which the alarm rings. This test should
be performed with a minimum cylinder
pressure of 1200 psig.
1)
To check a pressure demand appara-
Alarm sounds.
tus, pressurize the system by opening
the cylinder valve for a moment, then
close it. Place your hand or the rubber
protective cover over the regulator
outlet to block it leak-tight. Open the
mainline valve. The alarm should NOT
ring.
2)
Slowly remove your hand or the rub-
ber protective cover from the regula-
tor outlet and observe the drop in
pressure on the regulator gauge and
the point at which the Audi-Larm
begins to ring (Table 3-5). The ringing
will continue until air in the system is
exhausted.
C-28