Do not solder electronic equipment unless the equipment is electrically disconnected from the
power supply circuit.
After completing a task requiring a soldering iron other than the iron that is part of a work
station, disconnect the power cord from the receptacle. When the iron has cooled, store it in its
assigned stowage area.
The technician who smokes while using a cleaning solvent is inviting disaster. Unfortunately, many
such disasters have occurred. For this reason, the Navy does not permit the use of gasoline, benzine, ether,
or like solvents for cleaning since they present potential fire or explosion hazards. Only nonvolatile
solvents should be used to clean electrical or electronic apparatus.
In addition to the potential hazard of accidental fire or explosion, most cleaning solvents can damage
the human respiratory system where the fumes are breathed for a period of time.
The following positive safety precautions should be followed when performing cleaning operations.
Use a blower or canvas wind chute to blow air into a compartment in which a cleaning solvent is
Open all usable port holes and place wind scoops in them.
Place a fire extinguisher nearby.
If it can be done, use water compounds instead of other solvents.
Wear rubber gloves to prevent direct contact with solvents.
Use goggles when a solvent is being sprayed on surfaces.
Hold the nozzle close to the object being sprayed.
Where water compounds cannot be used, inhibited methyl chloroform (1.1.1 trichloroethane) should
be used. Carbon tetrachloride is not used. Cleaning solvents that end with ETHYLENE are NOT safe to
use. Methyl chloroform is an effective cleaner and is as safe as can be expected when reasonable care is
exercised, such as adequate ventilation and the observance of fire precautions. When using inhibited
methyl chloroform, avoid direct inhalation of the vapor. It is not safe for use, even with a gas mask,
because its vapor displaces oxygen in the air.
A 2M technician will encounter several uses for aerosol dispensers. The most common type is in
applying conformal coatings.
Specific instructions concerning the precautions and procedures that must be observed to prevent
physical injury cannot be given in this section because of the many available industrial sprays. However,
all personnel concerned with handling aerosol dispensers containing volatile substances must clearly
understand the hazards involved. They must also understand the importance of exercising protective
measures to prevent personal injury. Strict compliance with the instructions printed on the aerosol