TM 5-5420-226-20-1
P r e v e n t i v e M a i n t e n a n c e C h e c k s a n d S e r v i c e s f o r M 4 8 A 5 A V L B H u l l -
C o n t i n u e d
Item
No.
47
Interval
Semiannual
Location
Item to
Check/Service
Fixed Fire
Extinguisher
System
- Continued
Procedure
Not Fully Mission
Capable if:
NOTE
Leaks can be located by checking for frost on system lines immediately
after system is fired. If check is not completed immediately, all lines
normally will frost within 20-30 seconds and cover frost formed due to
leaks.
Person No. 1 and No. 2, immediately
after handle has been pulled and be-
fore delay valve releases charge
(when vapor is seen at left and right
spray tube assemblies), check system
from cylinders to delay valve for
sound of leaks, visible vapor, or
frosting around leak.
If vapor does not appear from engine
compartment within 10 seconds after
handle is pulled, proceed to step 13.
If vapor is seen from only one spray
tube assembly, proceed to step 12.
Person No. 2 also check that time
interval from firing announcement to
exit of vapor from engine spray
tubes was 6 to 10 seconds.
If time interval is less than 6 sec-
onds or more than 10 seconds, re-
place defective delay valve (page 20-
57).
3-82
Change 6
