1、 MIL-DTL-48555B 16 August 2012_ SUPERSEDING MIL-Q-48555A(AR) 26 November 1989 DETAIL SPECIFICATION QUADRANT, FIRE CONTROL - M17A1 This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers Quadrant, Fire Control:
2、 M17A1, 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. The documents listed in this section are specified in sections 3 and 4 of this specification.
3、 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 list, document users are cautioned that they must meet all requirements of documents cited in
4、 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: RDAR-QES-E, Picatinny Arsenal, New Jersey 07806-5000 or emailed to picaardecstdznbranchconus.army
5、.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 STATEMENT A. Approved for public release; distribution is unlimited. INCH-POUND Reactivated after 16 A
6、ugust 2012 and may be used for new and existing designs and acquisitions Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-48555B 2 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standard
7、s, 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 Spec
8、ification 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 Robbin
9、s 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 do
10、cuments 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 13005101 - M17A1 Quadrant 13010954 -
11、Plate, 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 th
12、e 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
13、without license from IHS-,-,-MIL-DTL-48555B 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 qu
14、adrant shall conform to drawing 13005101. 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
15、inspected 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.
16、8 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
17、3.14 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. Sub
18、sequent 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-48555B 4 FIGURE 1. Orientation of shock loads. 3.4.4 Vibration “A”. The quadrant shall withstand a total of 270 minutes of sweep-cycl
20、e 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 durati
21、on 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
22、the 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-poi
23、nt (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
24、no 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. Th
25、e 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-48555B 5 3.7 Cleanliness. There shall be no evidence of moisture, grease, fingerprints, condensates, dirt, debris, scratches, fractures or adhesive separa
27、tions 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
28、Correction 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 in
29、crements. 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 Correction
30、counter setting 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
31、within 0.5 mils. 3.8.6 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
32、torque for 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-48555B 6 TABLE II. Knob torque. Knob Torque at +60F to +90F Torque at +1
33、45 5F Torque 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 b
34、e in alignment within 1/16thinch. 3.11 Level vial illumination. With fresh batteries installed and the light turned on, the level vial bubble and markings shall be clearly distinguishable when observed in ambient light conditions ranging from dusk into night. 3.12 Counter illumination. With fresh ba
35、tteries installed 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 M171A1 mount that is wi
36、thin specification. 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-48555B 7 4. VERIFICATION TABLE III. Requirement/verification cross
37、reference 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 Conforma
38、nce X X X 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 exc
39、ursion range 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 Correction counter setting effect on elevation counter X X X 4.8.5 3.8.6 Correction counter setting effect on elevation level bubble X X X 4.8.6 3.9 Kno
40、b 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 license from IHS-,-,-MIL-DTL-48
41、555B 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 verification in accordance with T
42、able 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 4.6 Cleanliness 3.7 4.7 Elevati
43、on 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 Correction counter setting effect on elevation counter 3.8.5 4.8.5 Correction counter setting effect on elevation level bubble 3.8.6 4.8.6 Knob torque 3.9 4.9 Cou
44、nter 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) complete units. Provided by IHSNot for ResaleNo reproduction or networki
45、ng permitted without license from IHS-,-,-MIL-DTL-48555B 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 the sample fails to comply with any of the first article requirements,
46、 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 batches.” 4.3.2 Conformance inspection quantity. Conformance inspection
47、 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
48、-,-,-MIL-DTL-48555B 10 4.3.2.1 Quadrant. Drawing number 13005101 Classification Examination or test Conformance criteria Requirement paragraph Next higher assembly None Inspection method reference Critical None defined Major 101 Presence of Plate, Identification, 13010954 100% 3.3 Visual 102 Completeness of assembly 100% 3.3 Visual/tactile 103 Storage temperature 3 units per lot 1/ 3.4.1 4.4.1 104 Operating temperature 100% 3.4.2 4.4.2 105 Shock 100% 3.4.3 4.4.3 106 Vibration “B” 100% 3.4.5 4.4.5 107 Sealing 1
