TM-5-5420-279-10
Table A. 1 Inspection and action requirements (continued)
Inspection
Location
Time Interval
Action
Method
When CrackFirst gauge
Visual
Check for transverse
Zone B - Mid span
has cracked across
(vertical) cracks across weld.
under top chord at
central band between
Remove from service and
weld to side skins
12 mm holes until gauge
arrange repair if any cracks
has cracked completely.
longer than 36 mm are
found.
When CrackFirst gauge
Visual
Check for cracks at weld
Zone B - Welds
has cracked across
toes in either bottom of
attaching bottom of
central band between
trackway deck or diaphragm
trackway deck to top
12 mm holes until gauge
flange.
flange of diaphragms
has cracked completely.
Remove from service and
arrange repair if any cracks
longer than 36 mm are
found.
continued
A-6
