Try to fire again, using another blasting machine or power source, or a different operator.
Use the secondary firing system (for dual-firing systems).
Disconnect the blasting machine firing wire and wait 30 minutes before further investigation. Ensure that the
firing wires at the power source end of the circuit are shunted to avoid any possible static-electric detonation
before moving to the charge site.
Check the entire circuit, including the firing wire, for breaks and short circuits.
Do not attempt to remove either the primer or the charge.
Place a new electric primer and two pounds of explosive beside the original charge.
Disconnect the blasting cap wires of the original primer from the circuit, and short the cap's lead wires.
Connect the wires of the new primer.
Return to the safe area.
Initiate the detonation. The new primer will fire the original charge.
Direct-Priming Methods
When enough blasting caps are available, they may be primed directly into the explosives. There are several
methods that can be used, depending on the explosives and accessories available.
For demolition materials with a fuze well, the M1A4 priming adapter, shown in Figure 1-24, is used. The M1A4
priming adapter is a plastic, hexagon-shaped device threaded to fit the threaded cap wells on demolition blocks,
shaped charges, and the M10 universal explosive destructor, shown in Figure 1-25. A shoulder inside the
threaded end is large enough for a time fuse and detonating cord, but is too small for a military blasting cap. The
adapter is slotted lengthwise to permit quick and easy insertion of the electric blasting cap lead wires.
For demolition materials when an M1A4 priming adapter is not available, use the following procedure, as
illustrated in Figure 1-26:
Wrap a string tightly around the demolition block, and tie it securely, leaving approximately six inches of
loose string on each end.
Insert the blasting cap, with the time fuse attached, into the cap well.
Tie the loose string around the fuse to prevent the blasting cap from being separated from the demolition
block.
Figure 1-24. M1A4 priming adapter.
MM0170
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