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ATTACHMENT 0004
REDUCED LAT and FAT TESTING PLAN Date: May 16, 2023
A reduced test program has been developed to reduce the cost of LAT and FAT for the M772 & M776 fuzes, and to more accurately reflect the maturity of the MTSQ fuze design. Input from JUNGHANS MicroTech and CCDC-AC Quality Assurance were used to create the reduced testing and sampling plan.
The proposed LAT for the M772 and M776 fuzes are listed below in Tables 1 and 2, respectively.
| Group |
| Charge |
| QE (mils) |
| Temp |
| Set Time (s) |
| Samples |
| Comments |
| 1 |
| 1 |
| ~ 0 |
| 70°F (21°C) |
| S |
| 12 |
| Arming Safety |
| 2 |
| 1 |
| 800-1000 |
| 70°F (21°C) |
| 16.5 |
| 10 |
| Post Trans-Vibration |
| 5 |
| 4 |
| 1400 |
| 70°F (21°C) |
| 44 |
| 10 |
| Reduced from 20 to 10 |
| 6 |
| 2 |
| 1156 |
| -50°F (-46°C) |
| 28 |
| 10 |
| Reduced from 20 to 10 |
| 7 |
| 2 |
| 1156 |
| 145°F (63°C) |
| 28 |
| 10 |
| Reduced from 20 to 10 |
Total Samples: 52 Table 1 Proposed M772 LAT
| Group |
| Charge |
| QE (mils) |
| Temp |
| Set Time (s) |
| Samples |
| Comments |
| 1 |
| 1 |
| ~ 0 |
| 70°F (21°C) |
| S |
| 12 |
| Arming Safety |
| 2 |
| 1 |
| 1511 |
| 70°F (21°C) |
| 19 |
| 10 |
| Post Trans-Vibration |
| 4 |
| 4 |
| 800 |
| 70°F (21°C) |
| 26 |
| 10 |
| Reduced from 20 to 10 |
| 5 |
| 4 |
| 800 |
| -50°F (-46°C) |
| 26 |
| 10 |
| 6 |
| 4 |
| 800 |
| 145°F (63°C) |
| 26 |
| 10 |
Total Samples: 52 Table 2 Proposed M776 LAT
The proposed First Article Ballistic Test for M772 MTSQ Fuze are listed below in Tables 3 & 4.
Arming Safety Test (70°F/21°C)
| Charge |
| QE (mils) |
| Set |
| Quantity |
Table 3 Proposed Arming Safety Test for M772 Mechanical Time Functioning Test
| Group |
| Charge |
| QE (mils) |
| Temp |
| Set Time (s) |
| Samples |
| Comments |
| 1 |
| 1 |
| 800-1000 |
| 70°F (21°C) |
| 16.5 |
| 10 |
| Post Trans Vib |
| 2 |
| 4 |
| 1400 |
| 70°F (21°C) |
| 44 |
| 15 |
| 3 |
| 2 |
| 1156 |
| 70°F (21°C) |
| 28 |
| 15 |
| 4 |
| 2 |
| 1156 |
| -50°F (-46°C) |
| 28 |
| 15 |
Table 4 Proposed Time Function Test for M772 The proposed First Article Ballistic Test for M776 MTSQ Fuze are listed below in Tables 5 & 6.
Arming Safety Test (70°F/21°C)
| Cartridge |
| Charge |
| QE (mils) |
| Set |
| Quantity |
Table 5 Proposed M776 Arming Safety Test
Mechanical Time Functioning Test
| Cartridge |
| Charge |
| QE (mils) |
| Temp |
| Set (sec) |
| Quantity |
| Comments |
| 60mm |
| 1 |
| 1511 |
| 70°F (21°C) |
| 19.0 |
| 10 |
| Post Trans Vib |
| 60mm |
| 4 |
| 800 |
| 70°F (21°C) |
| 26.0 |
| 15 |
| 60mm |
| 4 |
| 800 |
| -50°F (-46°C) |
| 26.0 |
| 15 |
| 60mm |
| 4 |
| 800 |
| 145°F (63°C) |
| 26.0 |
| 15 |
Table 6 Proposed M776 Time Function Test
