1、 MIL-DTL-48556B 16 August 2012 SUPERSEDING MIL-Q-48556A(AR) 26 November 1989 DETAIL SPECIFICATION QUADRANT, FIRE CONTROL - M18A1 Reactivated after 16 August 2012 and may be used for new and existing designs and acquisitions This specification is approved for use by all Departments and Agencies of th
2、e Department of Defense. 1. SCOPE 1.1 Scope. This specification covers Quadrant, Fire Control: M18A1, which provides a measure of elevation angles for 155mm towed howitzers. It is equipped with numerical counters which indicate elevation settings and corrections. 2. APPLICABLE DOCUMENTS 2.1 General.
3、 The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this
4、 list, document users are cautioned that they must meet all requirements of documents cited in sections 3 and 4 of this specification, whether or not documents are listed in this section. Comments, suggestions, or questions on this document should be addressed to: Commander, US Army ARDEC, ATTN: RDA
5、R-QES-E, Picatinny Arsenal, New Jersey 07806-5000 or emailed to picaardecstdznbranchconus.army.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST online database at https:/assist.dla.mil. AMSC N/A FSC 1290 DISTRIBUTION STATEMEN
6、T A. Approved for public release; distribution is unlimited. INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-48556B 2 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards
7、, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-F-13926 - Fire Control Materiel, Manufacture, and Inspection, General Speci
8、fication for DEPARTMENT OF DEFENSE STANDARDS MIL-STD-1916 - DOD Preferred Methods for Acceptance of Product (Copies of federal and military specifications, standards, and handbooks are available online at https:/assist.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins
9、 Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these doc
10、uments are those cited in the solicitation or contract. U.S. ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER (ARDEC) DRAWINGS 11747195 - Vibration and/or Shock Fixture for Quadrant Fire Control XM17 and/or XM18 11747969 - Gage, Interchangeability Max 13005102 - M18A1 Quadrant 13010955 - P
11、late, Identification (Copies of these drawings may be requested online at pica.drawing.requestconus.army.mil or from U.S. Army ARDEC, ATTN: RDAR-EIS-PE, Picatinny Arsenal, NJ 07806-5000) 2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the
12、 text of this document and the references cited herein, the text of this document shall take precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. Provided by IHSNot for ResaleNo reproduction or networking permitted w
13、ithout license from IHS-,-,-MIL-DTL-48556B 3 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.2 Conformance. A sample shall be subject to conformance inspection in accordance with 4.3. 3.3 Quadrant. The qua
14、drant shall conform to drawing 13005102. 3.4 Environmental. 3.4.1 Storage temperature. The quadrant shall be thermally stabilized at temperatures of +160 5F and -60 5F for a period of not less than 4 hours at each temperature. While thermally stabilized at these temperatures, the quadrant shall be i
15、nspected and shall not exhibit any signs of physical failure or damage. Upon return to and stabilization at standard ambient temperature, +60F to +90F, the quadrant shall meet the requirements of 3.5 through 3.14 inclusive. 3.4.2 Operating temperature. The quadrant shall meet the requirements of 3.8
16、 through 3.14 inclusive while exposed to and thermally stabilized at temperatures of +145 5F and -50 5F for a period of not less than 4 hours at each temperature. Upon return to and stabilization at standard ambient temperature, +60F to +90F, the quadrant shall meet the requirements of 3.5 through 3
17、.14 inclusive. 3.4.3 Shock. The quadrant shall withstand a total of 75 shock impulses along 3 mutually perpendicular axes as defined in Figure 1. Each shock impulse shall be a half sine wave with a time duration of .010 .001 seconds and peak amplitude for each shock impulse as shown in Table I. Subs
18、equent to shock, the quadrant shall show no evidence of damage or physical failure and shall meet the requirements of 3.5 through 3.14 inclusive. TABLE I. Shock orientation and impulse. Orientation Shock impulse and direction Number of impulses Longitudinal -90 gs, +90 gs 15 each direction Vertical
19、-80 gs, +80 gs 15 each direction Transverse -80 gs 15 total Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-48556B 4 FIGURE 1. Orientation of shock loads. 3.4.4 Vibration “A”. The quadrant shall withstand a total of 270 minutes of sweep-cycle
20、 vibration. The vibration shall be applied for 90 minutes along each of the three mutually perpendicular major axes shown in Figure 1. A complete sweep-cycle shall consist of vibration from origin (5 Hz at 1 inch double amplitude) to mid-point (5 0.5 gs at 500 Hz) to origin, and shall have a duratio
21、n of 15 1 minutes. Double amplitude shall be constant at 1 inch between 5 Hz and 10 Hz, and varied with frequency to maintain a constant 5 0.5 gs acceleration between 10 Hz and 500 Hz. Upon completion of vibration, the quadrant shall exhibit no evidence of damage or physical failure and shall meet t
22、he requirements of 3.5 through 3.14 inclusive. 3.4.5 Vibration “B”. The quadrant shall be vibrated in the vertical plane shown in Figure 1 for a total of 15 1 minutes of sweep cycle vibration. A complete sweep-cycle shall consist of vibration from origin (5 Hz at 1 inch double amplitude) to mid-poin
23、t (5 0.5 gs at 500 Hz) to origin, and shall have a duration of 15 1 minutes. Double amplitude shall be constant at 1 inch between 5 Hz and 10 Hz and varied with frequency to maintain a constant 5 0.5 gs acceleration between 10 Hz and 500 Hz. Upon completion of vibration, the quadrant shall exhibit n
24、o evidence of damage or physical failure and shall meet the requirements of 3.5 through 3.14 inclusive. 3.5 Sealing. The quadrant shall be capable of sustaining an internal pressure of 5.0 0.10 pounds per square inch gage (psig) for a minimum of one hour with no evidence of leakage. 3.6 Purging. The
25、 interior of the quadrant shall be purged with dry nitrogen supplied at a pressure of 8.00 0.25 psig until the dew point of the emergent gas is no higher than -25F. Purging apparatus shall be removed, and subsequent to the seating of the pressure relief valve, the quadrant shall be pressured to 1.0
26、0.1 psig for all testing and delivery. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-48556B 5 3.7 Cleanliness. There shall be no evidence of moisture, grease, fingerprints, condensates, dirt, debris, scratches, fractures or adhesive separat
27、ions on glass windows or counters. 3.8 Performance. 3.8.1 Elevation counter excursion range. The elevation counter shall cover the excursion of at least 1433 mils in elevation and 280 mils in depression (9720 as read on the elevation counter) with the correction counter indicating “00 mils.” 3.8.2 C
28、orrection counter excursion range. The correction counter limit stops shall have a minimum of 95 mils excursion, but not over 99 mils excursion on the “+” and “-“ dials. 3.8.3 Elevation accuracy. The error at any elevation setting shall not exceed 0.5 mil. Nine readings shall be taken in 200 mil inc
29、rements. The total combined error of all readings shall not exceed 1.0 mil. 3.8.4 Backlash. The backlash in the elevating mechanism shall not exceed 0.7 mils at any elevation setting between 280 mils in depression (9720 as read on the elevation counter) and 1433 mils in elevation. 3.8.5 Cross level
30、vial bubble. The cross level vial bubble shall remain centered within the thickness of a graduation line when the quadrant is elevated from 280 mils depression (9720 as read on the elevation counter) to 1433 mils elevation and the elevation level vial bubble is centered. 3.8.6 Correction counter set
31、ting effect on elevation counter. Setting a positive reading into the correction counter shall decrease the elevation counter reading by the same amount within 0.5 mils. Setting a negative reading into the correction counter shall increase the elevation counter reading by the same amount within 0.5
32、mils. 3.8.7 Correction counter setting effect on elevation level bubble. Any change in position of the elevation level vial bubble shall not be greater that the thickness of a graduation line when any value within the excursion range of the correction counter is set. 3.9 Knob torque. The torque for
33、the elevation and correction knobs shall be within the ranges shown in Table II at the specified temperatures. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-48556B 6 TABLE II. Knob torque. Knob Torque at +60F to +90F Torque at +145 5F Torqu
34、e at -50 5F Elevation 3 to 10 inch pounds 13 inch pounds maximum 13 inch pounds maximum Correction 1 to 4 inch pounds 8 inch pounds maximum 8 inch pounds maximum 3.10 Counter numerals. With the unit digit of each counter centered in the aperture of the cover, the remaining numbers shall be in alignm
35、ent within 1/16thinch. 3.11 Level vial illumination. With fresh batteries installed and the light turned on, the level vial bubbles and markings shall be clearly distinguishable when observed in ambient light conditions ranging from dusk into night. 3.12 Counter illumination. With fresh batteries in
36、stalled and the light turned on, the numerals on the elevation and correction counters shall be clearly distinguishable when observed in ambient light conditions ranging from dusk into night. 3.13 Interchangeability. The quadrant shall be able to be installed on any M172A1 mount that is within speci
37、fication. 3.14 Workmanship. Workmanship of the quadrant shall be in accordance with the requirements of MIL-F-13926. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-48556B 7 4. VERIFICATION TABLE III. Requirement/verification cross reference
38、matrix. Method of Verification Class of Verification A - First Article B - Conformance 1 - Analysis 2 - Demonstration 3 - Examination 4 Test Section 3 Requirements Description Verification Method Verification Class Section 4 Verification 1 2 3 4 A B 3.1 First article X X X 4.2 3.2 Conformance X X X
39、4.3 3.3 Quadrant X X X 4.3.2.1 3.4.1 Storage temperature X X X 4.4.1 3.4.2 Operating temperature X X X 4.4.2 3.4.3 Shock X X X 4.4.3 3.4.4 Vibration “A” X X 4.4.4 3.4.5 Vibration “B” X X 4.4.5 3.5 Sealing X X X 4.5 3.6 Purging X X X 4.6 3.7 Cleanliness X X X 4.7 3.8.1 Elevation counter excursion ran
40、ge X X X 4.8.1 3.8.2 Correction counter excursion range X X X 4.8.2 3.8.3 Elevation accuracy X X X 4.8.3 3.8.4 Backlash X X X 4.8.4 3.8.5 Cross level vial bubble X X X 4.8.5 3.8.6 Correction counter setting effect on elevation counter X X X 4.8.6 3.8.7 Correction counter setting effect on elevation
41、level bubble X X X 4.8.7 3.9 Knob torque X X X 4.9 3.10 Counter numerals X X X 4.10 3.11 Level vial illumination X X X 4.11 3.12 Counter illumination X X X 4.12 3.13 Interchangeability X X X 4.13 3.14 Workmanship X X X 4.14 Provided by IHSNot for ResaleNo reproduction or networking permitted without
42、 license from IHS-,-,-MIL-DTL-48556B 8 4.1 Classification of inspection. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.2) b. Conformance inspection (see 4.3) 4.2 First article. When specified, a sample shall be subjected to first article v
43、erification in accordance with Table IV. TABLE IV. First article inspection. Examination or Test Section 3 Requirement Section 4 Verification Quadrant 3.3 4.3.2.1 Storage temperature 3.4.1 4.4.1 Operating temperature 3.4.2 4.4.2 Shock 3.4.3 4.4.3 Vibration “A” 3.4.4 4.4.4 Sealing 3.5 4.5 Purging 3.6
44、 4.6 Cleanliness 3.7 4.7 Elevation counter excursion range 3.8.1 4.8.1 Correction counter excursion range 3.8.2 4.8.2 Elevation accuracy 3.8.3 4.8.3 Backlash 3.8.4 4.8.4 Cross level vial bubble 3.8.5 4.8.5 Correction counter setting effect on elevation counter 3.8.6 4.8.6 Correction counter setting
45、effect on elevation level bubble 3.8.7 4.8.7 Knob torque 3.9 4.9 Counter numerals 3.10 4.10 Level vial illumination 3.11 4.11 Counter illumination 3.12 4.12 Interchangeability 3.13 4.13 Workmanship 3.14 4.14 4.2.1 First article quantity. First article inspections shall be performed on three (3) comp
46、lete units. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-48556B 9 4.2.2 First article inspection to be performed. The first article inspection shall be performed in accordance with Table IV. 4.2.3 First article rejection. If any item of th
47、e sample fails to comply with any of the first article requirements, the first article shall be rejected. 4.3 Conformance inspection. 4.3.1 Lot formation. Lot formation shall be in accordance with the lot formation requirements of MIL-STD-1916, paragraph “Formation and identification of lots and bat
48、ches.” 4.3.2 Conformance inspection quantity. Conformance inspection quantities shall be in accordance with MIL-STD-1916, paragraph “Sampling of lots or batches.” Conformance criteria shall be in accordance with 4.3.2.1 and MIL-STD-1916, paragraph “Verification level (VL).” Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-48556B 10 4.3.2.1 Quadrant. Drawing number 13005102 Classification Examination or test Conformance criteria Requirement paragraph Next hi
