1、MI L- L-2 6 9 9 O B( ASG) 18 APRIL 1967 Supxcecng I nL-L-26990L (ASS) 23 Ju1.y a957 MILITARY SPECIFI CATION LIGHT, MARKER, AIRPORT APPROACH, HIGH INTENSITY, TYPE MB-1 This specification has been approved by the Deparhent of the Air Force and by the Naval Air Systems Command. 1. SCOPE 1.1 marker ligh
2、t , designated type MB-1. 2. APPLICABLF: DOCUMENTS This specification covers one type of high-intensity, airport approach, *2.1 The following documents, of the issue in effect on date of invitation for bids or request f9r proposal, form a part of this specification to the extent specified herein : S
3、PECIFICATIONS Federal TT-A-580 Antiseize Compound, White Lead Base, General Purpose (for Threaded Fittings) Mil it arx MIL-C-7989 MILE17555 MIL-(2-25050 Covers, Light-Transmitting , for Aeronautical Lights Electronic and Electrical Equipment and Associated Colors, Aeronautical Lights and Lighting Eq
4、uipment, General Specification for Repair Parts, Preparation for Delivery of General Requirements for STANDARDS Federal FED. STD. NO. 595 Colore Military MIL-STD-100 Engineering Drawing Practices MIL- STD- 13 O MILSTD-14 3 Identification Marking of US Military Property Specifications and Standards,
5、Order of Precedence for the Selection of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-26990B (ASG) MIL-STD-810 Environmental Test Methods for Aerospace and MIL-STD-831 MS24321 MS33586 Metals, Definition of Dissimilar . Ground Equipment Test
6、Reports , Preparation of Lamp, Incandescent, T-20 Bulb, Medium Bipost Base (Copies of specifications , standards, drawings, and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting office
7、r.) 2.2 Other publications.- to the extent specified herein. date of invitation for bids or request for proposal shall apply. The following document forms a part of this specification Unless otherwise indicated, the issue in effect on Federal Aviation Agency L-823 Plugs and Receptacles, Cable Connec
8、tors (Application for copies should be addressed to the Federal Aviation Agency, Washington, D. C. 20553. ) “3. REQUIREMENTS 3.1 The light furnished udner this specification shall be a product which has been subjected to and which has passed the qualification tests specified herein, and which has be
9、en listed on or approved for listing on the applicable Quali- fied Products List. Qualification.- 3.2 Selection of specifications and standards. Specifications and standards for necessary commodities and services not specified herein shall be selected in accord- ape with MIL-STD-143. 3.3 Materials.
10、- 3.3.1 used where it ia practical to avoid them. they shall be treated with a fungicidal agent acceptable to the procuring activity, However, if they will be used in a hermetically sealed enclosure, fungicidal treat- ment will not be necessary. Fungus-proof materials.- Materials that are nutrients
11、for fungi shall not be Where used and not hermetically sealed, 3.3.2 Metals.- Metals shall be of the corrosion-resistant type or shall be treated to resist corrosion caused by fuels, salt spray, or atmospheric conditions as may be encountered in storage or normal service. The use of issimdlex metals
12、 as defined in m33586 shall be avoided, whenever practicable. 3.4 parts will work loose in service. vibrations , and other conditions incident to shipping, storage, installation, and service. easily made by the personnel of operating units and overhaul bases with a minimum of training with tools nor
13、mally available commercially. The light shall be BO designed that weight dshe1d“to the minimum, consistent withthe necessary strength and rigidity. The exact shape and design are optional, provided all requirements speci- fied herein are met. Design and construction.- The light shall be so designed
14、and constructed that no It shall be built to withstand the strains, jars, The light shall be so constructed that adjustments and repairs can be 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-L-26970B b2 W 997790b 0105748 5 9 3.4.1 Focus.- re
15、quiring no focusing at installation or in service. The entire optical system shall be of the fixed prefocus type, 3.5 Components.- The light shall consist of the following components: lustment.- The lower portion of the housing shall be designed to provide leveling of the light from any position not
16、 exceeding 4 degrees from the vertical. by four screws. larger, and the threads shall be treated with antiseize compound conforming to The leveling device shall be of the pivot type, adjustable from the top The screws shall be of the round- or fillet-head type, size 10 or TT- A- 5 8 O. 3.5.6.5 Aimin
17、g,- A means for leveling and sighting shall be provided. The device shall be of such design that the light can be aimed with sufficient accuracy that the direction of the light beams are in accordance with 3.6.1. The leveling device may be an accurately formed surface upon which a carpenters level m
18、ay be placed in two positions at right angles during installation. placed upon the light in such a manner as to provide accurate aiming by sighting at the next light in the row of runway lights, upper portion of the housing shall not be required during the leveling and aiming procedure. The sight ma
19、y be any device or marks Removal of the lens and filters from the 3.5.7 O00 I 3.6.1.1.1.1 The maximum for the main beams shall be 50,000 cp. 3.6.2 shall be 1,500 cp at 4 degrees to 10 degrees vertical, 450 cp at 2 degrees to i4 degrees vertical, and 200 cp at O degree to 30 degrees vertical. The min
20、imum for the off-runway side (95 degrees to 265 degrees horizontal) 3.6.i.i.3 candlepower values for the horizontal angles indicated at angles of O degree to 30 degrees above the horizontal : The maximum Tor the on-runway side shall not exceed the following Candlepower Horizontal angle (maximum) (de
21、grees 1 MIL-L-26770B 62 7777906 010575q O MIL-L-26990B(ASG) 100 350 to 10 250 340 to 20 500 330 to 30 1,000 320 to 40 5,000 310 to 50 3.6.i.i.i.4 minimums are not specified shall be 20 cp. The minimum in all directions above the horizontal for which other 3.6.1.1.2 the light shall be as follows. Min
22、imum acceptable requirements.- The minimum acceptable requirements for 3.6.1.1.2.1 by 4 decrees with round corners of 2-degree radii. at 10,OGO cp may be reduced to 15 degrees by 7 degrees with 3-112-degree radii, The 10-degree by 6-degree area at 20,000 cp may be reduced to 8 degrees The 20-degree
23、by 12-degree area 3.6.1.1.2.2 values at the horizontal angle indicated: The runway side maximums may be increased to the following candlepower Horizontal angle Candlepower (degrees) (minimum ) 340 to 20 1,000 330 to 30 2,000 320 to 40 3,000 310 to 50 4,000 3.6.i.2.3 be permitted, provided the averag
24、e value of any horizontal trace exceeds the appli- cable minimum value. The 200-cp minimum at elevations from O degree to 30 degrees may be reduced to 100 cp. Occasional dips below the minimum values specified in 3.6.1.1.1.2 shall . 9 Provided by IHSNot for ResaleNo reproduction or networking permit
25、ted without license from IHS-,-,-MIL-L-26770B 62 W 7777706 0105755 2 1-26990B( ASG) 3.6.1.2 nominal color filters to the white light. The design shall be such that when two filters are installed, all light emitted shall-be of the specified color. division shall be as sharp as practicable. of the div
26、iding plane is permitted in which the color requirements may be relaxed. The color division shall be in a vertical plane passing through the O-degree to 180- degree line. Colored light.- The colored light shall be obtained by adding 180-degree The color A 5-degree transition zone on each side *6.12.
27、1. The light emitted from the colored light shall conform to MIL-C-25050 for type I aviation colors. When filters are installed, the requirements for the white light shall apply, except the minimum candlepower values shall be multiplied by the factors specified below. Color Factors White Green Red 1
28、,oo 0.13 0.15 3.6.2 subjected to the following environmental conditons: Environmental.- The light shall be capable of operating satisfactorily when (a) (b) (c) Temperatures ranging from -54 to +55O C A relative humidity up to 100 percent with condensation Rainfall as encountered in any locale. 43.7
29、Part numbering of interchangeable parts.- All parts having the same manufactur- ers part number shall be fmctionally and dimensionally interchangeable. identification and part number requirements of MILSTD-100 shall govern the manufac- turers part numbers and changes thereto. 3.8 TEe length or width
30、 shall be not more than 10 inches. 3.9 Weight.- The weight of the light with filters installed shall not exceed i4 pounds. The item Dimensions.- The overall height of the light shall be not more than 14 inches. “3.10 Finishes and protective coatings.- Unless fabricated from corrosion-resistant metal
31、, all metal parts shall be suitably protected against corrosion. The outside of the light shall be finished with an aviation yellow finish color No. 13538 of Federal Standard No. 595. All paint and finishes used shall be suitable for the high-operat- ing temperatures involved, and shall not cause pa
32、rts of the light to stick together. 3.11 Identification of product.- Equipment, assemblies, and parts shall be marked for identification in accordance with MIL-STD-130, except the serial number need not be utilized. 3.12 Workmanship.- The light, including all parts and accessories, shall be con- str
33、ucted and finished in a thoroughly workmanlike manner. shall be given to neatness and thoroughness of soldering, wiring, marking of parts and assemblies, welding and brazing, painting, riveting, machine-screw assemblies, and freedom of parts from burrs and sharp edges. Particular attention 10 Provid
34、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-2b770B b2 97777Ob OL0575b LI MIL-L-26990B( ASG ) “3.12.1 Cleanin;,- The light shall be thoroughly cleaned; loose, spattered, or excess solder, metal chips, or other foreign material shall be removed, du
35、ring and after final assembly. 4. QUALITY ASSURANCE PROVISIONS r4.1 Responsibility for inspection.- Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all Inspection requirements as specified herein. utilize his own facilities or any comm
36、ercial laboratory acceptable to 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. Classification of inspection.- The examin
37、ation and testing of the light shall Except as otherwise specified, the supplier may “4.2 be classified as follows: (a) Qualification inspection (4.3) (b) Quality conformance inspection (4.4) Qualification inspection.- Qualkftcationinspection shall constat of all tests 4.3 specified under 4.5. 4.3.1
38、 two 180-degree red filters, and two 18O-degree green filters. Inspection samples.- The inspection samples shall consist of one white light, “4.3.2 Test report.- Upon completion of qualification inspection, a test report shall be prepared in accordance with MIL-STD-831 and three complete copies of t
39、he report furnished to the procuring activity. 4.4- Quality conformance inspection.- of the following: Quality conformance inspection shall consist (a) individual tests (b) Sampling plan and test 4.4.1 as specified under 4.5: Individual tests,- Each light shall be subjected to the following inspecti
40、ons (a) Examination of product (b ) Limited operat ion (c) Optical performance 4.4.2 Samplina pian and test.- 4.4.2.1 =.- same conditions and submitted for inspection at substantially the same time. 4.4.2.2 Sampling plan.- or fraction thereof on the order and subjected to the test specified in 4.5.4
41、. A lot shall consist of lights manufactured under essentially the One light shall be selected at random from each lot of 100 11 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-26990B(ASG) 4.4.2.2.1 Rejection and retest.- When one or more light
42、s from a lot fail to meet the specification, acceptance of all lights in the lot shall be withheld until the extent and cause of failure are determined. After corrections have been made, all necessary tests shall be repeated. 4.4;212,2 Continued individual tests.- For production reasons, individual
43、tests may be continued pending the investigation of a sampling test failure. ance of the entire lot shall not be made until it is determined thatthe lot meets all the requirements of this specification. But final accept- 4.4:3 Defects in items already accepted,- The investigation of a test failure c
44、ould indicate that defects exist in items already accepted. If so. the contractor shall fullyadvise the procuring activity of all defects-likely to be found and methods of correcting them. 4.5 Inspection methods.- 4.5.1 Examination of product.- with the requirements specified herein with respect to
45、materials, workmanship, and marking. 4.5.2 It shall be inspected to determine proper operation. The light shall be inspected to determine compliance Limited operation.- The light shall be compietely assembled and operated. *4.5.3 Optical performance.- Methods and procedures for conducting the optica
46、l performance test shall be prepared and submitted to the procuring activity prior to conducting the actual test. emitted by the light shall be determined. Insufficient candlepower or deviation of over 2 degrees,-either horizontal or vertical, from the direction indicated by the aiming device, shall
47、 be cause for rejection. 4.5.4 Photometric,- Photometric tests shall be conducted to determine compliance with light distribution and color requirements of 3.6.1. norma?. operating temperatures before any readings are taken. The candlepower and direction of the main. beams (See 6.2.) ,- All parts sh
48、all reach S4.5.5 Environmental.- At the discretion of the procuring activity (see 6.2), the light shall be subjected to the following tests, conducted in accordance with the applicable procedures of MIL-STD-810, to determine proper operation and lack of damage. 4.5.5.1 High temperature.- accordance
49、with Method 501, Procedure I. The lamp shall be operated at its rated current for a period of 7 hours in an ambient temperature of 55 t2 C. Abnormal bulb blackening, blistering, smoking, or other evidence of heat &nage to any part shall be cause for rejection. The light shall be subjected to high temperature in S4.5.5.2 Low temperature,- The light shall be subjected to low temperature in accordance with Method 502, Procedure I for a period of. 48 hour
