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 cracks at weld
Zone A - Ends of
has cracked across
toes in vertical direction.
welds attaching
central band between
Remove from service if any
diaphragm bottom
12 mm holes until gauge
cracks longer than 25 mm
flanges to side skins.
has cracked completely.
are found.
When CrackFirst gauge
Visual
Check for cracks at weld
Zone A - Toes of
has cracked across
toes in vertical direction.
welds attaching
central band between
Remove from service if any
vertical stiffeners to
12 mm holes until gauge
cracks longer than 25 mm
side skins at bottom
has cracked completely.
are found.
continued
A-5