TM55-2840-251-23
10-4
AIR LINES AND FITTINGS (Continued)
10-4-1
INSPECTION
1.
Inspect air lines and fittings for:
- Scratches
- Nicks
- Chafing
- Dents
- Pitting
- Corrosion and burrs
- Cuts
2.
Repair lines and fittings if:
- Scratches and pits not in excess of 0.005 inch
deep.
- Nicks and chafing not deeper than 25% of wall
thickness.
3.
Repair rubber sheating cuts not more than 3
inches long.
4.
Accept corrosion removable by polishing with
Crocus Cloth (E.41).
5.
Round bottom dents are permissible, provided the
depth is not greater than 10% of the normal outside
diameter of the tube. No more than three dents to the
maximum depth per 12 inch length of tube are
permissible and such dents shall be separated by at
least 0.250 inch. No dents are to be within 0.250 inch of
ferrules or fittings.
NOTE
Dents are unacceptable within one
inch of ferrule scarf-welds, or in the
area of a bend.
6.
Check resistance value of heating element plus
lead is 20
1.4 ohms for assembly without P3 filter
assembly. Check resistance of P3 filter outlet tube
heating element plus lead is 39.0
2.0 ohms and
resistance of P3 filter inlet tube heating element plus
lead is 41.2 2 ohms.
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