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MIL-DTL-11352 Block, Vision: Bullet-Resistant \(Metric\)This specification covers bullet-resistant vision blocks of two different types of construction, designed for use in combat type vehicles. In addition, this specification covers vision blocks with and without laser protection filters \(see 6.1\).

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MIL-DTL-11352K(AT)

TABLE V. Temperature profile.

Time

Temperature

Time

Temperature

(hours)

�C

(�F)

(hours)

�C

(�F)

0100

35 (95)

1300

69 (156)

0200

34 (94)

1400

70 (158)

0300

34 (94)

1500

71 (160)

0400

33 (92)

1600

70 (158)

0500

33 (92)

1700

67 (153)

0600

33 (91)

1800

63 (145)

0700

36 (97)

1900

55 (131)

0800

40 (104)

2000

48 (118)

0900

44 (111)

2100

41 (105)

1000

51 (124)

2200

39 (103)

1100

56 (133)

2300

37 (99)

1200

63 (145)

2400

35 (95)

TABLE VI. Gun fire shock levels.

Amplitude (g)

Duration (ms)

Axis

100�10

1.0�0.1

Vertical

55�5.5

1.7�0.2

Latitudinal

225�22.5

0.5�0.05

Longitudinal

4.6.4.6 Vibration. To determine conformance to 3.7.6, the vision block shall be

mounted, in a manner that will simulate its actual use, and vibrated along each axis in accordance

with the test levels specified in table VII and as shown in figure 3 for a frequency range from

5 to 500 to 5 Hz applied within a sweep time of 15 minutes for a maximum cycling time of 3

hours. The frequency of applied vibration shall be swept over the specified range

logarithmically in accordance with figure 4. The specified sweep time is that of an ascending

plus a descending sweep and is twice the ascending sweep time shown in figure 4 for the

specified range. When vision block resonances below 5 Hz are measured or expected, the test

curve shall be extended to 2 Hz and the sweep time shall be 18 minutes (2 to 500 Hz). At the

conclusion of the test, the vision block shall be tested in accordance with 4.6.3.1, 4.6.3.2 and

4.6.3.3 and checked for any damage or defect.

TABLE VII. Vibration levels.

Frequency,

Amplitudes

Hertz (Hz)

Vertical

Latitudinal

Longitudinal

5 - 5.5

�0.5 in.

5.5 - 25

�1 g

25 - 37

�0.02 in. (peak to peak)

�0.02 in.

37 - 500

�2 g

4.6.4.7 Humidity resistance. To determine conformance to 3.7.7, the vision block shall

be exposed to a total of 48 hours (two 24-hour cycles) to the humidity profile shown in