A02 - 3 General Spec SAWS Mortar Weapons 1 January 2019.pdf

General Specification for PdD SAWS Mortar Weapon Systems – 1 January 2019

Distribution Statement A. Approved for public release; distribution is unlimited.

Project Manager Maneuver Ammunition Systems

Product Director Special Ammunition and Weapon Systems

GENERAL SPECIFICATION FOR

PdD-SAWS MORTAR WEAPON SYSTEMS

1 January 2019

1. SCOPE

This specification describes the performance requirements and identifies the verification procedures for the Mortar Weapon systems. This specification supports the acquisition of a smooth bore mortar weapon system consisting of a Barrel, Sighting Device, Base plate, Bipod and

Basic Issue Items (BII). This specification includes the minimum essential Engineering and

Packaging Requirements and the necessary Quality Assurance Provisions to determine that these requirements have been met.

2. APPLICABLE DOCUMENTS AND DEFINITIONS

Order of precedence, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

2.1 Documents

INTERNATIONAL TEST OPERATING PROCEDURES DOCUMENTS

ITOP 4-2-805 Projectile Velocity and Time of Flight Measurements, 20 September 2005.

ITOP 3-2-810 Weapon Chamber Pressure Measurements, 18 December 1985.

ITOP 3-2-803 Visual Inspection of Cannon Bores, 1 October 1992.

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION DOCUMENTS

ISO 3452-4 Non-Destructive Testing - Penetrate Testing - Part 4: Equipment - First

Edition; Together with ISO 3452-1, ISO 3452-2 and ISO 3452-3 Cancels and Replaces

ISO 3452:1984

ISO DIS 9934-1 Non-destructive testing - Magnetic particle testing - Part 1: General principles

INTERNATIONAL STANDARDS FOR PHYTOSANITARY MEASURES DOCUMENTS

ISPM-15 International Standards for Phytosanitary Measures No. 15 http://specs4.ihserc.com/Document/Document/ViewDoc?docid=NRQJDFAAAAAAAAAA

General Specification for PdD SAWS Rocket Propelled & Spin Stabilized Grenades - 1 January 2019

2.2 Definitions;

The pressures below are in descending order i.e. DP (highest), ESCP (lowest)

System Design Pressure (DP): The design pressure is the pressure for which the test item was designed for, including safety factor. The System DP is equal to the Cannon DP or

Projectile DP, whichever is the lower for a specified system.

System Permissible Maximum Pressure (PMP): The Permissible Maximum (PMP) is a service pressure which should not be exceeded statistically more than thirteen (13) times over the course of 10,000 extreme service condition rounds. The System PMP derived either the pressure of cannon PMP or projectile PMP whichever is the lower for a specified system.

Maximum Operating Pressure (MOP): Where the Extreme Service Condition Pressure

(ESCP) (population mean) and the corresponding pressure standard deviation

(populations) are known then MOP is the ESCP plus three standard deviations estimated during the cannon design phase. The MOP may be equal to but not greater than System

Permissible Maximum Pressure.

Extreme Service Condition Pressure (ESCP): Is the mean chamber pressure developed when firing the specified system at the maximum temperature extreme with the addition of the pressure variances that have been recorded to due to tube to tube, occasion to occasion, and propellant lot to lot, differences.

Mils: The TDP shall list the type of optics included with the weapon.

For this document;

The Warsaw Pact mil is defined as an angle comprising 1/6000th of a circle, equal to 0.06 degrees and shall appear with “WP” after mils. i.e. 200 mils(WP)

The NATO mil is defined as an angle comprising 1/6400th of a circle, equal to 0.05625 degrees and shall appear with “NATO” after mils. i.e. 200 mils(NATO).

3. REQUIREMENTS

3.1 General requirements: Mortar weapon system and its associated parts shall conform to the applicable drawings provided by the manufacturer. The mortar weapon systems shall be of new production (within three (3) years of the delivery date, free of corrosion, gouges, dents, cracks and in good working order. Basic Issue Items (BII) shall be provided.

3.2 Reliability: Each mortar weapon system shall perform the firing, pressure sustaining, projectile launching and accuracy functions. The manufacturer shall use ammunition of their choice which is capable of demonstrating that the mortar weapon system meets all the requirements of this specification. Additionally the mortar weapon system must be serviceable under conditions including temperature extremes of at least +50C to -25C without interference, erratic movement or malfunctions. There shall be no impairment in the functioning of mortar weapon assemblies, component assemblies, or component parts, during and/or after firing. After field maintenance is performed, the mortar weapon system must continue to operate in weather/climatic conditions including; snow, rain, mud, salt spray, dust/sand storm and solar radiation.

3.3 Maintainability: The manufacturer must ensure the availability of spare parts and BII for the mortar weapon system for a minimum of five (5) years after final delivery. The mortar weapon system must not require special tools other than what is provided by the manufacturers BII.

3.4 Packaging: Packaging and packing shall be in accordance with section 4.5 of this specification or as otherwise specified in the contract or purchase order.

3.5 Marking: Marking shall be in accordance with section 4.3.1 of this specification or as otherwise specified in the contract or purchase order.

3.6 Durability: The mortar weapon system shall possess the required durability to withstand the rigors of mounted/dismounted patrol and firing all propellant zones from a variety of ground surfaces; sand, crusher run, loam and hard packed soil.

3.7 Interchangeability: All barrels, assemblies, sub-assemblies and parts shall be interchangeable with all other mortar weapon systems regardless of lot and/or sublot.

3.8 Compatibility: The mortar weapon system must be capable of providing 95% to 105% of the maximum range when compared to the lot history report of the ammunition chosen for use during the LAT. Meteorological and Elevation corrections can be applied to the results if necessary.

To ensure compatibility of each mortar weapon system with its associated ammunition the following Extreme Service Condition Pressure (ESCP) must be met:

60mm Mortar Weapon System ESCP shall be ≥ 515 kgf/cm2

82mm Mortar Weapon System ESCP shall be ≥ 665 kgf/cm2

120mm Mortar Weapon System ESCP shall be ≥ 985 kgf/cm2

4. VERIFICATION

4.1 Technical verification. The mortar weapon system shall be subject to all requirements of applicable technical data in addition to verification in accordance with TABLE I of this specification. Noncompliance to any requirements shall be cause to withhold acceptance of the lot or batch in which the noncompliance was found.

TABLE I. Requirements/Conformance Verification [Lot Acceptance Testing (LAT)]

Section 3

Requirements

Section 4

Verification Procedures

Sample Size

3.1 General requirements 4.1 All systems

3.2 Reliability 4.2 All systems

- 3.3 Maintainability N/A N/A

3.4 Packaging 4.5 All systems

3.5 Marking 4.3.1 All systems

3.6 Durability N/A N/A

3.7 Interchangeability 4.3.7 All systems

3.8 Compatibility N/A N/A

4.2 Live Fire Testing:

4.2.1 Seating the Baseplate;

The Baseplate shall be firmly seated to the manufacturer’s satisfaction prior to beginning the proof testing. It is recommended that at least one cartridge be fired at top charge during the seating of the baseplate.

4.2.2 Proof Testing;

All weapons shall be proof tested as a complete system utilizing the associated components accompanying that weapons serial number.

It is recommended that cartridges with inert fill be used during this test, however the decision shall be left to the manufacturer.

Elevation/Traverse; the weapon shall be set to 45 degrees [750 mils(WP), 800 mils(NATO)] elevation. The traverse shall be centered and the system re-leveled.

Depending on the information in the provided publications, the proof pressure shall be determined using the methods below. If there is sufficient information for both methods, use the method which yields the highest proof pressure.

Method 1: The cartridge shall be loaded with additional propellant so that its chamber pressure is at least the System Permissible Maximum allowable Pressure (PMP).

Should the cartridge fail to reach the minimum System PMP up to four (4) additional attempts can be made to achieve it. If the barrel fails to reach system PMP in five (5) attempts, the barrel shall be re-inspected for damage and the contractor shall notify the US

Government by contract letter to determine the disposition of the barrel.

Should a cartridge achieve a pressure of over the System Design Pressure (DP), the barrel shall be marked in a way to ensure it can be differentiated from the other barrels being tested. The barrel, however, may continue to be ballistically tested and inspected as per this specification. The contractor shall notify the US Government by contract letter, to determine the disposition of the barrel. The barrel shall not be marked with a proof mark until the disposition by the US Government to do so is received.

Once a cartridge reaches a pressure between the System PMP and System DP, the Proof test is complete.

Method 2: The cartridge shall be loaded with additional propellant so that its chamber pressure is five (5) Standard Deviations (StdDev) in excess of the Maximum Operating

Pressure (MOP).

Should the cartridge fail to reach a minimum of five (5) StdDev overpressure, up to four

(4) additional attempts can be made to achieve it. If the barrel fails to reach this minimum in five (5) attempts, the barrel shall be re-inspected for damage and the contractor shall notify the US Government by contract letter to determine the disposition of the barrel.

Should a cartridge achieve a pressure of ten (10) StdDev or more over pressure, the barrel shall be marked in a way to ensure it can be differentiated from the other barrels being tested. The barrel, however, may continue to be ballistically tested and inspected as per this specification. The contractor shall notify the US Government by contract letter, to determine the disposition of the barrel. The barrel shall not be marked with a proof mark until the disposition by the US Government to do so is received.

Once a cartridge reaches five (5) to ten (10) StdDev overpressure, the Proof test is complete.

Method 3 (Given ESCP): The cartridge shall be loaded with additional propellant so that its chamber pressure is 12% - 16% in excess of the Extreme Serviceable Condition Pressure

(ESCP).

Should the cartridge fail to reach a minimum of 12-16% overpressure up to four (4) additional attempts can be made to achieve it. If the barrel fails to reach 12-16% in five

(5) attempts, the barrel shall be re-inspected for damage and the contractor shall notify the

US Government by contract letter to determine the disposition of the barrel.

Should a cartridge achieve a pressure of 12-16% or more over pressure, the barrel shall be marked with in a way to ensure it can be differentiated from the other barrels being tested.

The barrel, however, may continue to be ballistically tested and inspected as per this specification. The contractor shall notify the US Government by contract letter, to determine the disposition of the barrel. The barrel shall not be marked with a proof mark until the disposition by the US Government to do so is received.

Once a cartridge reaches an overpressure between 12% and 16% the Proof test is complete.

4.2.2.1 Proof Test Report

At the conclusion of the Proof Test a report shall be provided to PdD SAWS. The report shall contain at a minimum the following information:

a. Part name

b. Drawing number and revision

c. Test date

d. Serial number of weapon(s) tested

e. Required values

f. Actual values

g. Attribute requirements

h. Attribute requirements verification - Pass/Fail status. If “Fail”, description of failure

i. Copies of associated test reports, for instance, Ultrasound Test reports

j. Lot number

k. Test technician’s/engineer’s name

4.2.3 Traverse Left, Traverse Right, and Elevation Testing;

Test quantity shall be the three (3) weapons or 2% of order quantity, whichever is greater not, but not to exceed five (5) weapons.

The cartridges for this test shall be fired at highest charge that allows for their maximum range. Two (2) cartridges shall be fired for each test, four (4) total.

High Elevation/Left Traverse Test; As the weapon is traversed and elevated special care shall be taken to note any evidence of stiff, binding or erratic operation. The weapon shall be set to an elevation of 75 degrees [1250 mils(WP), 1333 mils(NATO)]. The traverse shall be moved to the far left of its adjustable range and the system re-leveled. Two (2) cartridges shall be fired.

Low Elevation/Right Traverse Test; As the weapon is traversed and elevated special care shall be taken to note any evidence of stiff, binding or erratic operation. The weapon shall be set to an elevation of 60 degrees [1000 mils(WP), 1067 mils(NATO)]. The traverse shall be moved to the far right of its adjustable range and the system re-leveled. Two (2) cartridges shall be fired.

The traverse and elevation shall be checked and the system re-leveled before each shot.

4.2.4 Weapon Sight and Interface verification;

Test quantity shall be the three (3) weapons or 2% of order quantity, whichever is greater not, but not to exceed five (5) weapons.

Spotting cartridges shall be used prior to the beginning of the test, however once the test below has begun no additional spotting cartridges are allowed. Every cartridge discharged thereafter shall count toward the pass/fail criteria. With the weapon seated to the satisfaction of the manufacturer, the following tests shall be conducted. All testing, fifteen

(15) cartridges total, shall be High Explosive cartridges set to point detonation mode and shot at maximum charge/range. Between shots within a subtest, only minor leveling/bubble adjustments to the weapon are allowed. Use of sand bags on the base plate and/or bipods is allowed.

Subtest 1: The weapon shall be set to an elevation of 45 degrees [750 mils(WP), 800 mils(NATO)] and the azimuth set to 4.6125 degrees [77 mils(WP), 82mils(NATO)] to the left of center range. Five (5) HE test cartridges shall be discharged with observers noting their respective range and deflection.

Subtest 2: The weapon shall be set to an elevation of 45 degrees [750 mils(WP), 800 mils(NATO)] and the azimuth set to 4.6125 degrees [77 mils(WP), 82 mils(NATO)] to the right of center range. Five (5) HE test cartridges shall be discharged with observers noting their respective range and deflection.

Subtest 3: The weapon shall be set to an elevation of 65.025 degrees [1084 mils(WP), 1156 mils(NATO)] and the azimuth set to 0 mils, center range. Five (5) HE test cartridges shall be discharged with observers noting their respective range and deflection.

Evaluation of Range; The Average Corrected Range (corrected for elevation and meteorological conditions) shall be calculated for Subtest 2 and Subtest 3, from the test data. This average shall fall within the upper and lower limits of the equations below. The respective cartridges’ firing table, at the applicable elevation and shall be within;

Ballistic Range Upper Limit (BRUL) =Firing Table Range + [Firing Table Range / 200]

Ballistic Range Lower Limit (BRLL) =Firing Table Range - [Firing Table Range / 200]

BRUL ≥ Average Corrected Range ≥ BRLL

Evaluation of Deflection; The Average Corrected Deflection (corrected for elevation and meteorological conditions) shall be calculated for Subtest 1 and Subtest 2, from the test data and shall be within;

Allowable Corrected Deflection Upper Limit (ACDUL) = Average Corrected Range X sin(4.6125 degrees) + [Average Corrected Range / 400]

Allowable Corrected Deflection Lower Limit (ACDLL) = Average Corrected Range X sin(4.6125 degrees) - [Average Corrected Range / 400]

ACDUL ≥ Average Corrected Deflection ≥ ACDLL

FIRING MATRIX

Section Subtest Rounds Elevation Cartridge

4.2.1 Seating 1-5

Manufacturers discretion Any

4.2.2 Proof 1-5

750 mils(WP), 800 mils(NATO) Inert or HE

4.2.3

Traverse Left and High

Elevation

1250 mils(WP), 1333 mils(NATO)

HE

4.2.3

Traverse Right and Low

Elevation

1000 mils(WP), 1067 mils(NATO)

HE

4.2.4 Weapon

Sighting 15 Various HE

4.3 Post Live Fire inspections;

All weapons used during Live Fire Testing 4.2.3 and 4.2.4 shall be inspected. All weapons used during Proof testing 4.2.2 shall be Magnetic Particle inspected (4.3.2.5). Results shall be provided in the test report.

4.3.1 Marking:

Mortar barrels, assemblies and sub-assemblies shall be clearly and legibly marked to prevent mismatch between different mortar calibers and model types. Such markings shall be in accordance with the requirements and drawings as provided by the manufacturer. Each mortar barrel shall receive a permanent pressure proofing mark/stamp provided it passes all of the Live

Fire testing and Magnetic Particle inspection within in this document. No mortar barrel shall be shipped or accepted without a permanent pressure proof mark or stamp.

4.3.2 Inspections; Mortar barrel

4.3.2.1 Firing Pin Protrusion: The protrusion of the firing pin from the bottom of the barrel shall be in accordance with the manufacture’s requirements.

4.3.2.2 Interior Dimensions, Leakage and Distortion: Visually inspect the barrel and breech cap for distortion, bulging or cracks. The barrels inner diameter shall be inspected at a minimum of three (3) approximately evenly spaced points over the length of the barrel. At each of these lengths the diameter will be measured twice at 90 degree intervals for a total of six (6) diameter measurements. These measurements shall ensure interior tolerances, as provided by the manufacturer, are met. Additionally the barrel shall be leak tested to ensure air tightness.

4.3.2.3 Barrel, Interior surface: The barrel bore surface shall be free of material and processing defects such as cracks, seams, tears, flakes, gouges, scratches, corrosion and pits. The following conditions of the barrel bore surface are acceptable:

a) A scratch having a depth no greater than 0.0004 inch regardless of its width.

b) A pit with a depth no greater than 0.001 inch and having a diameter or any other major dimension no greater than 0.030 inch, provided that the total number of pits present throughout the bore does not exceed twenty five (25) and the total number of pits present in any square inch of surface area does not exceed five

(5).

Any defects in excess of those listed above, or not covered, must be reported to PdD

SAWS for engineering disposition.

4.3.2.4 Barrel Length: The interior barrel length with applicable tolerance shall be as per the dimensions provided by the manufacturer or +/- 0.5 cm whichever is smaller.

4.3.2.5 Magnetic Particle Inspection of the Barrel: This inspection shall be conducted after all live fire testing has been completed, as per ISO 3452-1, 2, 3, 4 and ISO DIS 9934-1.

The entire exterior surface (360 degrees for the full length of the of the barrel including the end cap) shall be inspected twice by magnetic particle inspection with magnetic fields;

1) Parallel to the axis of the barrel

2) Perpendicular to the axis of the barrel

The magnetic particles shall contain a dye which fluoresces when exposed to Ultra Violet light. Inspection for cracks shall be done in a dark room with the aid of an Ultra Violet light, after being exposed to the magnetic particle solution and while the barrel is being exposed to the magnetic fields.

4.3.3 Inspections; Bipod

4.3.3.1 Bipod General Inspection: Ensure all applicable parts are present and are in an unbent condition. The chain between the bipod legs (if applicable) shall not be broken or show evidence of permanent deformation. Bipod shall fold and unfold without excessive effort.

4.3.3.2 Bipod Cross leveling, Traverse and Elevation testing: The weapon is Cross Leveled, Traversed and Elevated through its full range of motion(s). During these cross leveling, traverse and elevation movements, special care is taken to note any evidence of stiff, binding or erratic operation. Additionally there shall be less than 1/8 of a turn (backlash) of the cross leveling, elevation or traversing hand wheel(s) before movement occurs.

4.3.3.3 Bipod Clamping interface and shock absorber: The bipod shall provide a firm clamping force to the barrel. The barrel shall not slide freely when hung under its own weight.

Inspect the bipod/barrel clamp interface for gouges. Ensure there are no bulges on the shock absorber or leaking hydraulic fluids (if applicable). The shock absorber shall be manually cycled to ensure no damage has occurred.

4.3.4 Inspections; Baseplate

These inspections shall be conducted after all live fire testing has been completed.

4.3.4.1 Baseplate General Inspection: Ensure all applicable parts are present and there is no evidence of permanent deformation and/or cracks. There shall be no binding between the latched ball/socket connection when the barrel is rotated. The base plate shall be retained on the barrel when hung under its own weight via its latched ball/socket connection.

4.3.4.2 Dye Penetrate Inspection of the Baseplate: Each baseplate shall be subjected to a complete liquid dye penetrate (Zyglo) inspection for cracks and trammel point locations will be marked and measured for each baseplate, as per ISO 3452-4 and ISO DIS 9934-1.

4.3.5 Inspections; Weapon sight / Attachment interface: This test verifies there is no significant play or movement between the weapon sight and its weapon mounting interface. The test shall be conducted in accordance with the manufacture’s requirements. An example of how to conduct a weapon sight interface test is included in Appendix A.

4.3.6 Visual Inspections; Weapon and Basic Issue Items (BII): Visual defects shall be identified within the TDP and include a defined method for acceptance/rejection of the mortar weapon and all applicable BII items. Visual inspections listed in ANNEX A shall be the minimum requirement.

4.3.7 Interchangeability: All weapons used during Live Fire Testing 4.2.3 and 4.2.4 shall be broken down into their bipod, base plate and barrel assemblies. The barrels from each respective system shall be moved one system to the right. The baseplates from each respective system shall be moved one system to the left. The bipods shall remain in their respective locations. All systems shall be capable of being reassembled. If it is not possible to reassemble the systems, the contractor shall notify the US Government by contract letter, to determine the disposition of the systems.

4.4 Documentation: At the completion of mortar verification, the test authority will document all pertinent data regarding the hardware under test/inspection in a report. The report will include the test authorities’ recommendation of acceptance or non-acceptance. A copy of the Live Fire Test report, Visual, and Dimensional Inspection report shall be provided for each mortar system (or its major components if purchased separately).

All raw data as well, as corrected data (if applicable), collected during live fire testing covered in section 4.2 shall be provided in the report. The X and Y coordinates of the raw data for each shot, corrected data for each shot, and corrected averages shall be provided using the gun position as the reference point i.e. (0,0).

These reports shall be sent to: usarmy.pica.peo-ammo.list.pm-mas-pdd-saws-ops-cell@mail.mil

4.5 Packaging: The weapons shall be delivered with applicable packaging, lubricants and protectants to ensure the weapon system does not deteriorate during transportation and/or sheltered long term storage. The systems must be palletized and in accordance with ISPM-15 standards.

Steel strapping shall be used to constrain the cargo/weapon system. Dunnage shall be used to ensure the strapping does not damage the palletized hardware.

5. NOTES:

This section contains information of a general nature or explanatory nature that may be helpful, but is not mandatory.

5.1 Acquisition requirements.

Acquisition documents should specify the following:

a. Title, number, and date of the specification

b. List of drawings, specifications, and publications pertinent to the mortar system technical details and usage; showing revisions and dates of revisions

c. Shipping instructions for each mortar, or its major subassemblies (cannons, bipods, and baseplates) if purchased separately

d. Serialization requirements should be as specified in corresponding drawings

5.2 Accuracy of commercial inspection equipment.

When commercial and modified commercial inspection equipment is used, it should be capable of repetitive measurements to accuracy of 10 percent of the total tolerance of the characteristic that is measured.

5.3 Accuracy of proof pressure measuring devices.

Each crusher gage that is used for measuring proof firing pressures should have an accuracy that meets the maximum error of measurement as specified in NATO

AEP-23.

5.4 Calibration.

All inspection and test equipment should be calibrated in accordance with the requirements of NCSL Z540.3 or ISO 10012. Proof of calibration should be provided upon demand.

mailto:usarmy.pica.peo-ammo.list.pm-mas-pdd-saws-ops-cell@mail.mil

5.5 Performance characteristics inspection and verification.

All requirements should be verified with approved equipment, specified tests, examination, and procedures.

5.6 Materials and geometric configuration.

Complete and accurate substantiating documentation supporting the acceptability of each mortar weapon system and the components thereof should be compiled and maintained by the manufacturer for the life of the individual weapon. Failure to comply with the drawings requirements, unless specifically waived in the contract, should be cause for rejection.

5.7 Nonconformance.

If any assembly, component, or test specimen fails to comply with any of the requirements of this specification, that unit should be removed, and the actions in MIL-

STD-1916 for nonconforming product should be enforced. No repair is authorized unless repair work instructions are approved by the Government.

5.8 Alternative inspection provisions.

Alternative conformance procedures, methods, or equipment, such as statistical process control, tool control, other types of sampling procedures, may be used by the contractor when they provide as a minimum the level of quality assurance required by the provisions specified herein. Prior to applying methods or equipment, the contractor should describe them in a written proposal submitted to the Government for evaluation. When required, the contractor should demonstrate that the effectiveness of each proposed alternative is equal to or better than the specified quality assurance provision(s) herein. All approved alternative provisions should be specifically incorporated into the contractor's quality program or detailed inspection system, as applicable.

Frank Altamura

Product Director Special Ammunition and Weapon Systems

Picatinny Arsenal, NJ

Annex A: Visual Inspection Requirements

APPENDIX A – Sample Weapon Sight / Attachment Interface Test

ANNEX A – Mortar Weapon and BII Visual Inspection Requirements

Critical: 5-0-12 Major: 5-1-22

Re-inspection: 15-3-4 (cumulative)1

Minor (5-3-4)2

Re-inspection: 15-3-4 (cumulative)1

Missing, cracked, loose or bent parts Cases with moving components; loose pack Excessive grease, oil or dirt

Gross corrosion, pitting, or deformation Missing, illegible or incorrect marking Minor surface corrosion

Missing proof mark Wire security seal missing Dents, chips, scratches or burrs

Proof mark present on non-proof tested weapon Incorrect non-critical components Paint damaged, wet or incomplete

Incorrect critical components consisting of base plate, bipod, mortar tube, sight, or firing pin (i.e. 60mm base plate supplied on 120mm mortar weapon system)

Note 1: If the number of allowable defects is exceeded a double sample quantity shall be re-inspected. The accept/reject criteria is based on the cumulative number of defects for all three samples.

Note 2: If a critical is found or the number of allowable majors or minors, after re-inspection, is exceeded the lot fails.

APPENDIX A - Weapon Sight / Attachment Interface verification

Securely latch the sight to its respective weapon sight interface.

Step1: Insert the sight unit into its respective interface. Anchor the bipod in a vise, sand bags or similar manner to ensure its immobility. With the bipod at center traverse, aim the right side of the vertical sight unit reticle onto the left side of the blue rectangle on the

Weapon Sight Verification Target. The distance between the purple and blue rectangles on the Weapon Sight Verification Target (Step 3) is 3 centimeters across and placed 100 meters from the sight.

Step 2: Level the sight unit, and lock the bipod traverse and sight unit into place.

Step 3: The gunner, while looking through the sight unit, will press forward, with one hand, on the cantilevered sight unit along the line of fire. The force should remove all free play from the sight unit in its respective interface. While looking through the sight the right side of the cross hair shall not pass the right edge of the light blue rectangle. At this range, a 1.5cm deflection equals 0.14 mils(WP), 0.15 mils(NATO) of deflection.

Step 4: With the bipod at center traverse, aim the left side of the sight unit reticle onto the right side of the dark blue rectangle on the Weapon Sight Verification Target (Step 6)

Step 5: Level the sight unit, and lock the bipod traverse and sight unit into place.

Step 6: The gunner, while looking through the sight unit, will press backwards, with one hand, on the cantilevered sight unit along the line of fire. The force should remove all free play from the sight unit in its respective interface. While looking through the sight the left side of the cross hair shall not pass the left edge of the dark blue rectangle. At this range, a 1.5cm deflection equals 0.14 mils(WP), 0.15 mils(NATO) of deflection.

If the “play” in the sight unit interface exceeds 0.14 mils(WP), 0.15 mils(NATO) in either direction, the results must be reported to PdD SAWS for engineering disposition.

APPENDIX A

Weapon Sight Verification Target

Step 3 (Pass / Fail)

The right side of the cross hair shall not pass the right edge of the of the light blue rectangle

APPENDIX A

Weapon Sight Verification Target

Step 6 (Pass / Fail)

The left side of the cross hair shall not pass the left edge of the of the dark blue rectangle