1、c * e MIL-I-275q4C bb 9999906 0335240 9 = F- 58-a.3 MIL-I-27544C(USAF) SUPERSEDING MIL-I-27544B(USAF) 7 March 1966 5 APR 85 MILITARY SPECIFICATION INDICATOR, LIQUID OXYGEN QUANTITY This specification is approved for use by the Department of the :Air Force, and is available for use by all Departments
2、 and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements for liquid oxygen quantity indicators. from O to 25 liters of liquid oxygen. The indicators are of th.e capacitance type and indicate 1.2 Classification. The indicators shall be of the followin
3、g types, as specified (see 6.2): GMU- 2 8 /A Cover glass coated with antireflection coating in GMU-2 8A/A Cover glass coated with high efficiency antireflection accordance with.MIL-C-675 coating as defined herein. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards.
4、Unless otherwise specified (see 6.2), the following specifications and standards of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DODISSI specified in the solicitation, form a part of this specification to the extent specified herein. SPECIFICATIO
5、NS FEDERAL PPP-B-601 Boxes, Wood Cleated-Plywood PPP-B-636 Boxes, Fiberboard MILITARY MIL-P-116 Preservation, Nethod of MIL-C- 6 7 5 Coating of Glass Optical Elements (Anti-Reflection) MIL-1-25645 Indicator, Liquid Oxygen Quantity, Capacitance Type, MIL-L-27160 Lighting, Instrument, Integral, White,
6、 General General Specification for Specification for _ _ - _.- - Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: the Engineering Division, San Antonio Air Logistics Center, Kelly AFB, Texas 7824
7、1 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. .- -. _-_ _. _- _-_ - - - - - -. . . - - T FSC 6680 THIS DOCUMENT CONTAINS -p- - PAGES Licensed by Information Handling Services_- -. MIL-I-27544C 66 777770b
8、 0335243 O NIL-1-27 544C( USAF) STANDARDS FEDERAL FED-STD-595 Colors MILITARY MIL-STD-129 MIL-STD-147 MIL-STD- 781 MIL-STD-794 MIL-STD-1186 BS 3 3 5 5 8 Marking for shipment and storage Palletized Unit Loads Reliability Tests, Exponential Distribution Part and Equipment Procedures for Packaging and
9、Packing of Cushioning, Anchoring, Bracing, Blocking and Waterproofing with Appropriate Test Methods Numeral and Letter , Aircraft Instrument Dial, Standard Form of (Copies of specifications and standards required by manufacturers in connection with specific acquisition functions should be obtained f
10、rom the contracting activity or as directed by the contracting officer), 2.1.2 Other publications. The following document(s) form a part of this specification to the extent specified herein. The issues of the documents which are indicated as DoD adopted shall be the issue listed in the current DoDIS
11、S and the supplement thereto, if applicable. * AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D 3951 Standard Practice for Commercial Packaging (Application for copies of ASTM publications should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia,
12、Pennsylvania 19103). JR 2.1.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. 3. REQUIREMENTS 3.1 First Article. When specified, a sample shall be subjected to first article
13、inspection(see 4.3 and 6.3). 3.2 General specification. The requirements of MIL-1-25645 shall apply as requirements of this specification with the exceptions and additions called out herein. When the two specifications conflict, this specification shall govern. 3.3 Configuration. -The indicator shal
14、l consist of a single unit containing all the equipment necessary to meet the performance requirements specified herein and in MIL-1-25645. 2 %4 4% .4 Licensed by Information Handling ServicesMIL-I-275YYC bb W 7977906 0335242 2 WIDTH OF LINE OR +.O05 GRADUATION MIL-I-27544C (USAF) FINISH COLOR PER F
15、ED-STD-595 4- .O05 t- 2.000- - MARKING LIPUID OXYGEN HEIGHT OR LENGTH 5.010 FLAT SURFACE Numerals Liquid Oxygen Maior Grad Minor Grad NUMERALS h LETTERS SHALL COHFORH TO MS33558 .140 -140 .188 .125 Liters Background UNLESS OTHERWISE SPEC1 F I E D, DIMENSIONS ARE IN INCHES. 37875 4 37038 FIGURE 1. Di
16、al 3 Licensed by Information Handling ServicesAHPHENOL P/N 182-1-1000 OR EOUAL (INDICATOR CONNECTOR 1 SHIELDED LEAD TO INPUT CO- co- AX AX - 115 VOLT, 400 CYCLE -6 6 LOW LEVEL WARNING LICHT -c C 5 VOLT, 400 CYCLE E E - PRESS TO TEST F F - UNSHIELDED LEAD TO INPUT H H - - - - .I_ - - - GROUND J J - I
17、 (MAT IN G CONNECTOR) FIGURE 2. Connector Wiring 4 Licensed by Information Handling Services-_ MIL-I-27544C 66 777770b 0135244 b MIL-I-27544C (USAF) 3.4 Case. The length of the case shall not exceed 5.0 inches. 3.5 Dial. The dial for the indicator shall conform to figure 1. - 3.6 Cover glass coating
18、 (GMU-28A/A). The indicator cover glass for the GMU-28A/A indicator shall be provided with a reflection-reducing coating which meets the requirements of MIL-C-675 except that the following reflectance tolerances shall apply: Angle of Wavelength Percent Incidence (Millimicrons) Re lec t ance O“ 450 -
19、 675 0.6 maximum O“ 425 - 700 0.5 average 30 o 4.50 - 625 1.0 maximum 30“ 425 - 700 0.5 average 3.7 Electrical connector. The electrical connector shall be in accordance with figure 2. The indicator shall be designed internally so that it will function properly when the mating electrical connector i
20、s wired as shown on figure 2. The coaxial shield shall be grounded within the indicator. 3.8 Capacitance. For design purposes, the capacitance for zero reading shall be 303.5 micromicrof arad (uuf) . 3.9 Adjustments. The zero calibration adjustment for the indicator shall be capable of adjusting the
21、 pointer to zero indication over an input capaci- tance range of at least 295.0 uuf to 330.0 uuf. With the indicator adjusted to zero indication at 295.0 uuf input capacitance, the indicator shall be capable of calibration to full scale indication at 437.5 uuf input capacitance by means of the full
22、calibration adjustment. With the indicator adjusted to zero indication at 330.0 uuf input capacitance, the indicator shall be capable of calibration to full scale indication at 475.0 uuf input capacitance by means of the full calibration adjustment. 3.10 Weight. The indicator shall weigh not more th
23、an 1.5 pounds. 3.11 Accuracy. When the indicator is tested as specified in MIL-1-25645, the accuracy of the indicator shall be in accordance with table I. The toler- ance for room-temperature readings is the allowable deviation from the nominal calculated values. All other tolerances are the allowab
24、le deviations from the actual room-temperature readings. 3.12 Integral lighting. The indicator shall have integral lighting con- forming to MIL-L-27 160. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the con- tract or purchase order, the contractor
25、is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other 5 Licensed by Information Handling ServicesNIL-1-2 7 544C ( USAF ) facilities suitable for the performan
26、ce of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.
27、 TABLE I. Tolerances for Capacitance Readings TOLERANCE PLUS OF NINUS TE ST Accuracy - room temperature Low temperature operation High temper ature operation Vibration Power supply variation Low temperature storage and operation High temperature storage ana operation Salt spray Cycling 1.8 uuf 2.5 u
28、uf . 2.5 uuf 1.4 uuf 1.4 uuf 2.5 uuf 2.5 uuf 1.4 uuf 1.4 uuf 4.2 Sampling, inspecting, and testing procedures, Sampling, inspecting, and testing procedures shall be in accordance with MIL-1-25645. * 4.3 First Article Inspection. * 4.3.1 First Article Test - The first article test shall consist of al
29、l tests described under tests methods of MIL-1-25645 including reliability and longevity tests which shall be conducted in accordance with MIL-STD-781. The GMU-28A/A indicator shall be subjected to the additiona1,test described in 4.4.1 of this specification. 4.4 Test methods - 4.4.1 Cover glass ref
30、lectance (GMU-28A/A). The reflectance of the GMU-28A/A indicator cover glass shall .be measured and shall be within the tolerances specified in 3.6. * 5. PACKAGING. * 5.1 Preservation and packaging. Preservation and packaging shall be Level A, C or Commercial/Industrial as specified (see 6.2). 5.1.1
31、 Level A. The indicator shall be preserved andpackaged in accordance with method 1C of MIL-P-116 and placed in a container conforming to PPP-B-636. 5.1.2 Level C. The Level C preservation for the indicator shall conform to the MIL-STD-794 requirements for this level. 6 Licensed by Information Handli
32、ng Services5.1. Commercial. . _-_ The Commercial preservation of indicator shall be in accordance with the-requirements of ASTM D 3951. 5.2 Packing. 5.2.1 Level A. The indicator preserved and packaged as specified in 5.1 shall be packed in a container conforming to PlT-13-601, overseas type. The clo
33、sure shall be in accordance with the appendix of the container specification. 5.2.2 Level B. The indicator shall be preserved and packaged as specif-ied in 5.1.1 shall be packed in fiberboard containers conforming to PPP-B-636 Weather Resistant. The closure shall be in accordance with the appendix o
34、f the container specification. 5.2.3 Level C. The indicator shall be preserved and packaged to require- ments of NIL-STD-794 for this level. 5.2.4 Commercial. Commercial/industrial packing of indicator shall be in accordance with the requirements of ASTM D 3951. 5.2.5 Palletized Loads. When specifie
35、d (See 6.2) unitized loads, commensu- rate with the level of packing specified in the contract or order, shall be palletized in accordance w.ith MIL-STD-147. Unitized loads shall be uniform in size and quantities to the greatest extent possible. If the container is of a size which does not conform t
36、o any of the pallet patterns specified in MIL-STD- 147, the pallet pattern used shall first be approved by the contracting officer . 5.3 Phvsical Drotection. Cushioning. blockine. bracing and waterDroofine Y, YI u ,u shall be in accordance with MIL-STD-1186. Waterproofing requirements for cushioning
37、 material and container shall be waived for domestic shipments. The a - drop tests of MIL-STD-1186 shall be waived when the items are preserved and packaged for immediate use or when the drop tests, MIL-P-116 are applicable. 5.4 Harking. 5.4.1 Level A, B 6 C. In addition to any special or other iden
38、tification marking required by the contract (see 6.2) each unit pack intermediate and exterior container and unitized load shall be marked in accordance with MIL- STD-129. 5 requ 6 6 4.2 Commerci-al/industrial marking shall be in accordance with the rements of ASTM D 3951. NOTES 1 Intended use. The
39、indicators covered by this specification are intended or use in indicating the quantity of liquid oxygen remaining in the converters in C-5.4, C-130EY and C-141 airplanes. i- 6.2.1 Acquisition requirements. Acquisition documents should specify the following: a. Title, number and date of this specifi
40、cation b. Type of indicator required (see 1.2) -1. c. Selection of applicable levels of preservation, packaging, packing, marking and commercial/industrial. * d. When palletized loads are required (see 5.2.5). 7 Licensed by Information Handling Services_; MIL-I-27544C bb 7779406 0135247 II m MIL-I-2
41、7544C (USAF) 6.3 First Article. When a first article inspection is required, the item will be tested and should be a first article sample or it may be a standard production item from the contractors current inventory. The first article should consist of single unit. specific instructions in acquisit
42、ion documents regarding arrangements for examinations, tests and approval of the first article. The contracting officer should include 6.4 Changes from previous issue. The margins of this specification are marked with asterisks to indicate where changes (additions, modifications, corrections, deleti
43、ons) from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irre- spective of th
44、e marginal notations and relationship to the last previous issue. Custodian: . Air Force - 99 Review activities: Air Force - 11 DLA - GS Navy AS International interest (see MIL-1-25645) Preparing Activity: Air Force - 82 Project 668O-FZ08 * V.S. GOVERNMENT PRINTING OFFICE1 988-105-038/21755 8 Licensed by Information Handling Services
