TB 1-1520-238-20-140
SECTION II. REMOVING A CMB
2. REMOVING A CMB
2.1.
Description: This task covers removing a CMB from an assembly or subassembly.
2.2.
General Information: A CMB is removed in one of two ways. Either it must be forcibly removed from
a permanently affixed position on the component, or the identification tag it is taped to must be cut off
from the component. Either way, the CMB must be read and removed prior to starting repairs to the
component.
2.3.
Initial Setup
Materials:
Tools:
Dry Ice (Item 1, Table 2)
Phenolic Wedge
Corrosion Preventive Compound (CPC) (Item 10, Table 2)
WARNING
Dry ice is solid carbon dioxide that has a temperature below -112 F (-80 C).
Contact with skin will cause serious low temperature burns. Temperature
resistant gloves/apron required. Carbon dioxide displaces oxygen, which
can cause asphyxiation. Use only in a well ventilated area.
CAUTION
When removing a CMB, care should be taken not to damage the surface of
the component.
NOTE
If a component is being cannibalized, each component that requires a CMB
(See Table 1) must have its own CMB tag tied to it with all applicable
maintenance data uploaded to the CMB for that component prior to
shipping.
A CMB either permanently affixed to the component or attached by an
identification tag must be read prior to removing. Refer to Section I of this
document on downloading the CMB.
All CMB tags must be removed from a component prior to component
assembly or installation.
5
