1、MIL-L-715E 62 m 7777906 0078427 3 m MIGG7158E (ASG) 15 SEPTEMBER i969 Superseding MIL6007158D(USAF) U March 1969 MILITARY SPEC IFICATION LIGHT, BEACON, ROTATING, 2:$:;&;i:z2* c;2 -* .i. rl p.,:?:. 4*- I . ;i ;7-$-yy . ?;a 3.1 Preproduction. - This specification makes provisions for preproduction 3.2
2、 Components. - The light assembly shall consist of the base, rotating testing. mechanism, and projector housing(s) with optical system. i. . 3.3 Selection of specifications and standards. - Specifications and standards for necessary commodities and services not specified herein shall be selected in
3、accordance with MILSTD-U3. 3.4 Materials. - Materials shall conform to applicable specifications as speiified herein and on the drawings or standards. Materials which are not specifically designated shall be of the best commercial quality and suitable for the purpose intended. 3.4.1 Metals. - 3.4.1.
4、1 Bronze castings. - Bronze castings shall be in accordance with - - - QQ-C-390, alloy No. B6. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- ,- MIL-L-7L5E 62 = 9999906 0098LI29 7 = - ,- ,- MILL7158E (ASG) 3,4.1.3 Fasteness, - Fasteners shall be of
5、 nonferrous metal or corrosion- resistant steel, and shall be provided with self-locking nuts, lockwashers, or other equal means of preventing %he pats from working loose under prolonged vibration; metal or corrosion-resistant steel inserts. Design and constraction, - The light to be supplied shall
6、consist of Bolts subject to frequsrt removals shall be threaded into nonferrous t 3*5 the item covered by the part rimbar on MS254.43 or MS2544.4, as specified (see 6.2). 3.5.1 Altemate desigfi. - Lights manufactured with parts of slightly dif- ferent designs than those shown on the applicable FAA d
7、rawing numbers will be considered- sat.isfactory, provided tne aifiterence in design . does _ not affect the . performance or ixerchangeabilit-y of the assemblies 3.5.2 GperatLxE conditions, - The light shall be designed and constmcted for continuous outdoor use mder all weather conditions at any am
8、bient temperature from a minimum of -54“ C (-65“ F) to a maximm of +55“ C (131“ F). 3.6 Ferformance., - Th6 light shall satisfy the performance requirements specified in see5ion .!+, when subjected t.0 the applicable tests. 3.6.1 Caridlepower distributiond - With the cover glass (lens) removed, the
9、vertical lignt distribution throiliffi the focal axis of the beacon shall be es- sentially as shown by the solid line on figure 1, Measurements shall be taken using a MS25Oi5-2 lamp. of 13.55 by, i06 candle-degrees, distribution (thyoligh focal axis) enclose an area of less than 1360 by 106 candle-d
10、egrees within fne iimits defined by the solid line shown on figure 1. In no instake shall the vertica distribution curve fall inside the area defined by the inner (dashed) line shown on figure 1. horizontal width of the beam shall be not less than 1 degree at the vertical aagles and Irxensities defi
11、ned by the dshed line shown on figure 1. required dfstrlhii;ion shall be obtained by properly positioning the lamp and tile auxiliary reflector witn respect to the principal reflector and by tilting V.e driisz if necessary, ob%ain the in-liai faciory sdjustmezt Ehe hypothetical cume (solid line) def
12、ines an area In no iristance shall the vertical light in addition, the “he No means of Focusing, other than that required to need be provided. 3.7 Rai, - ?“r-.e base, conforming to Drawing E-2341, shall consist of an alunina-ailoy bedplate, a bewing support, three supporting studs or legs, and a pan
13、 emlosfiig The operathg mechanism. 3.8 RoSatin: mecnanam. - The rotsting mechanism, conforming to Drawing 0-2311, shall consist. esssntiay of a turntable and vertical spindle, main bearhgs, chtch, gears, sd mot,or. assembled that thsie will be no objectionable vibration of the lamps at any speed up
14、to 24 rp. The entire rotating mechanism shall be so 3 3 ,-. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-L-7158E 62 m 7777706 0078430 3 m DM;REES O FIGURE 1. Candlepower distdbution (vertical) 4 Provided by IHSNot for ResaleNo reproduction or
15、networking permitted without license from IHS-,-,-MIL-L-715E 62 = 7999906 009Li31 5 MILW7158E (ASG) 3.8.1 Turntable. - The housing drum shall be supported on a rectangular steel turntable, threaded, and then welded to the top of the vertical hollow steel spindle. The free joint between the turntable
16、 and the bearing support shall be protected by a weather skirt terminating below the joint and at least linch from any part of the base. support, as shown on Drawing D-2312, shall be supplied to support the two lights. When duplex units are furnished, a drum .- 3.8.2 Main bearings. - The main bearin
17、gs shall consist of two bearings supporting a vertical spindle within a bearing support. shall be a tapered roller-bearing. similar and equivalent to Victor Seal No. 60771. a permanently lubricated ball bearing. aligned, and shall be provided with a double seal similar and eqdvalent to New Departure
18、 seal No. 88509. lubricator in accordance with MS15006. The upper bearing It shall be backed up with an oil seal . The lower bearing shall be It shall keep the spindle vertically The upper bearing shall be provided with a i. The clutch shall consist of 3.8.3 Clutch. - A clutch assembly shall be prov
19、ided to permit the gear train to rotate without injury in case the drum is prevented from rotating by an ice lock or other obstruction to rotation. a cadmium-plated spring steel plate attached to- a bronze nut, threaded to a gear sleeve, and so designed as to permit the clutch tension to be adjusted
20、 - . - . by compressing the plate against the continuous boss on the web of the cast-iron control section of the worm wheel. The nut shall be arranged for locking to the . .,;:.;, ;. _ ;J :?:%y?L,:, .;zi:2Fzsc; z;3- gear sleeve by a setscrew engaging slots at 90 degree; fitervals on the sleeve. !.-
21、.:.rs*-ft*: .- _._- .* -.P.!- - a. c:;. nor more than i5 pound-feet initially on the vertical spindle for single drum -:-*-Y? ” -?-”.-* * ,+:-,. e :. The clutch shall be adjusted to provide a torque of not less than 10 pound-feet ,c ,?.c$+ . -_ -.:a* beacons, and not less than 15 pound-feet nor more
22、 than 20 pound-ieet for duplex beacons . Cr - 3.8.4 Gears. - Each light shall be provided with a worm and a worm wheel reduction gear designed to provide the specified angular velocity (see 6.2). The worm gear shall be of bronze, 1-inch pitch diameter, double thread for 12-rp beacons, single tnread
23、for 6-rpm beacons, and shall ride a fi-ee fit on a 1/2-inch motor shaft. The worn shall be engaged by a pin carried by a driving collar at”,ached to the motor shaft. treated with a rust-preventive slushing compound, and a micarta ring seating against a flange and shoulder, and held in place by eight
24、 equally spaced No. 10 brass machine screws. The micarta ring shall be threaded to mesh with the bronze driving worm. A bronze gear sleeve (same sleeve to which the clutch adjusting nut is threaded) shall be threaded to the vertical spindle and shall be provided with lugs and flanges for the mountin
25、g of the two upper slip-rings and the contactor or blank cam. driving worm, provide a running fit. of the light may be readily changed from nominal12 rp to nominal 24 rp or to nominal 6 rpn by changing the driving worm and the micarta ring on the worm wheel. The worm wheel shall have a cast-iron cen
26、ter section, It shall also support the worm wheel in vertical alignment with the Clearance between the gear sleeve and the worm wheel hub shall The gears shall be so arranged that the rotation speed The driving worm shall be shielded to prevent the throwing of grease. 5 r- .r y- r Provided by IHSNot
27、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-h- MIL-L-7158E 62 m 7999906 0098432 7 Y ,I; .y,-? 3.8.5 Motor. - Each beacon shall be equipped with a 1/6-hp, iiy, 60-cycle f- :i.;: Ga. MILL7158E (ASG) 1,UO rpn motor of the squirrel-cage type. single-row, deep-groove,
28、sealed, prelubricated, double-shield, annular-type bearings. lubrication for the life of the bearing. mechanism through the worm gear. on the underside of the bedplate in such a manner as to insure exact alignment and meshing between the worm gear and worm wheel without the use of shims. motors shal
29、l be fuiiy interchangeable with each other as to mounting and shaft dimensions and shall be dynamically balanced to prevent setting up any objection- able vibrations. Each motor shall be equipped with The sealed, prelubricated bearings shall not require additional The motor shall drive the rotating
30、it shall be ceiling-mounted on machined bosses All 2.Cy.5Ll Motor details ._ -All motors shall have separate starting and running windings, and a centrifugal switch which di-:- 6.2 Ordering data. - Procurement documents should specify the following: - -. . . .* .- (a) Title, number, and date of this
31、 specification. (b) .Applicable part number of the beacon desired (see 3.5 and 3.10.1). (c) When the cover glass and lens are to be furnished with the beacon (see 3.9). (d) Requirement for rp (see 3.8.4). (f ) Location and conditions for-preprduction-iXspecti;orr-and- -a- - instructions for submitti
32、ng test report (see 4.3). (g) Whether the candlepower requirements are required on each light and whether the lamp position may be checked by means of a lamp focusing gage (see 4.5.4.2). (h) Applicable level of preservation, packaging, and packing (see section 5). (i) Any special marking required (s
33、ee 5.3). -(e)-When drayiggs, parts-lists, etc., are to be provided (see 3.U.l). - -. _. 6.3 Maegal indicia. + Asterisks are not used in this revision to identify changes with respect to the previous issue, due to the extensiveness of the changes Custodians : Air Force - 11 Navy - AS Preparing activity: Air Force - 11 Project No. 6210-F338 Reviewer activity: &ir Force - 82 * U. S. GOVERNMENT PRINTING OFFICG 1969-393-066/5-2439 13 f- i.L- . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
