OPERATIONS AND MAINTENANCE INSTRUCTIONS

ILLUSTRATIONS:

1 BuOrd Dr. 434329 - Depth Charge Booster Mark 6 Mod. 4 - General Arrange-ment

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Add paragraph 48(a) as follows:

Depth Charge Booster Mark 6 Mod. 4, Figure 1, is a conventional booster unit of 'tin can' construction similar to Depth Charge Booster Mark 6 Mod. 2. The use of rivets instead of spot welding to attach the booster head socket provides a more reliable connection to withstand shipboard handling, shock and vibration. After loading and sealing the booster is coated with rust preventive compound (52-C-18) Grade 2 by spraying or dipping at the loading depot. This protective treatment should also be applied aboard ship from time to time as circumstances require to prevent corrosion of the can. The Booster Mark 6 Mod. 4 contains approximately 3.125 pounds of granular TNT. The total weight of the compo-nent is approximately 3.875 pounds.