TM 5-4520-253-13
Table 3-2. Unit Preventive Maintenance Checks and Services-Continued
M—Monthly
Q-Quarterly
Interval
Item
ITEM TO BE INSPECTED
No.
M
Q
PROCEDURE
f. Place tester at center of heater output. Allow air being sampled to flow
through detector tube into evacuated pump for 3 minutes. Release han-
die with half turn. The handle should move back no more than 5 cc (0.306
cu in.).
g. Perform step f two more times for a total of 9 minutes of sampling.
h. Remove tube from pump and place vertically on concentration chart.
Position tube with stained end down so that the boundary between end
plug and resin at inlet (point O) is over line O-O and point X is over line
X-X. Read air concentration corresponding to length of stain O-C.
i.
If carbon monoxide level exceeds 35 ppm, isolate cause and repair
heater.
All data on Pages 3-18 through 3-23 have been deleted.
Change 1
3-17
