Appendix C. QUALITY ASSURANCE INSPECTION INSTRUCTIONS OPTICAL MATERIAL-PRESSURIZED ITEMS

SB 74-95-700

TRC 5OP

APPENDIX C

QUALITY ASSURANCE INSPECTION INSTRUCTIONS

OPTICAL MATERIAL-PRESSURIZED ITEMS

TRC-50P

Section Numbers) (Single Sampling

C-1.

Purpose.

The purpose of this inspection

Plan). MILSTD-105.

instruction is to provide necessary information and

(3) Select, in a random manner, a sample from

procedures for inspection of Armament Fire Control

the lot of Items.

Materiel which either contains optics or are optical in

(4) Visually inspect the packaging of each

nature and/or which may be pressurized with a dry

sample item for defects cited in section II and appendix

nitrogen atmosphere.

(5) Remove packaging.

C-2. Policy. These inspection instructions have been

(6) Visually inspect each sample item for the

designed to detect any significant deterioration of

defects cited in appendix A.

materiel in storage and to avoid over inspection.

(7) The requirements herein shall apply to visual

inspection of optics or materiel containing optics or to

C-3. Instruction. For purposes of this inspection

items that are pressurized; while in storage. The

instruction, applicable materiel is identified in appendix A

technique of shading will not be used except for

and cites the TRC of this appendix as supplementary

detecting moisture. In case of deviation between the

inspection instructions. Inspect each item for the defects

following and the item technical data package (TDP), or

listed in appendix A and for the instructions in this

an applicable technical manual (TM), the TDP or the TM

appendix instruction.

shall take precedent (Refer to MIL-STD-124 for definition

a. References.

of terms).

(1).

TM 750-116 General Procedures for

(8) Items found acceptable shall be replaced to

Purging and Charging of Fire Control Instruments

their original configuration and returned to storage.

(2). NSN 4931-00-065-1110 Purging Kit

(9) A defective item will remain defective until it

(3). NSN 4931-00-065-1110 Fixture Pressure

is repaired or replaced.

Test

(10) Samples with major defects or samples

b. Inspection Conditions.

which cannot be returned to their original package

(1) Inspection Lot: An inspection lot is defined as

configuration shall be segregated and reported for

all items having the same level of packaging and year of

disposition instructions.

manufacture, rebuild or modification.

(2) Inspection frequency: Inspection frequency

C-4. Inspection Procedure.

shall be as prescribed in appendix B or as determined by

a. Optical Material.

other sources.

(1) Moisture or condensation. There will be no

(3) Inspection lot disposition criteria:

evidence of moisture, condensation, or staining resulting

(a) Accept lot. Accept in accordance with d

from moisture on optical elements. Should such a

below.

condition exist classify the item as a major defective.

(b) Reject lot. Reject in accordance with d

Some items contain dry nitrogen gas under a slight

below.

pressure to keep moisture out and avoid oxidation. If the

c. Defect Classification.

item has purging and charging ports, the item will be

(1) The failure of any one of the applicable visual

purged and charged with dry nitrogen using NSN 4931-

inspections or the pressurization test specified below

00-065-1110 as specified in TM 750-116, General

shall be considered a major defect.

Procedures for Purging and Charging of Fire Control

(2) The failure of any quality defect code (QDC) in

Instruments (see C-4.(b)).

appendix A shall be considered a defect to the level

(2) Fracture. No fractures will be allowed on any

indicated by the QDC, critical, major or minor.

surface optical element. Should damage be found

d. Inspection Methods.

classify the item as a major defective.

(1) For a lot of Items, Inspection Level (IL) S-3

(3) Smears or fingerprints. There shall be no

applies. See table 2-1, (Master Sampling Plan) MIL-

evidence of any smears or fingerprints on optical

STD-105.

surfaces. Should such a condition exist classify the item

(2) For a lot of Items, the following Acceptable

as a minor defective.

Quality Levels (AQL's) apply:

(4) Chips. The presence of chips on optics

Majors Minors

between the reticle and the objective end of the

0.65

4.0 See Table 2-2, (Acceptance and Re-

instrument

C-1