1、M I LIA- 68 48 21 AugWt.160 Superseding AN-A-29 ACCTj AIRCRAFT This specification was approved by the Departments of the Aw, the Navy, and the Air Force for use of procurement services of the respective Departments. 1. scope 1.1 m.0 This specification comm three-pointer type visual maximum indicatin
2、g accelerometers. 2 APPLICABLE SFECIFICATIONS, OTHER PUBLICATIONS, AND *DRAWINGS 2.3 The following publications, of the issue in effect on date o invitatj.on for bids, shall form a part of this specification ta the extent specified herein: I I 2.1.1 Specifications.- (28-15i QQ-P-Ub Plathgj Cadmium (
3、Electrodeposited) Metals; Qeneral Specification For Inspection of Military MIL-D-5028 Drawings and Data LiStSj Preparation of (For Engines. Accessories and Other Auxiliam .I AN-QQ-A-696 AN-Ir-1 Luminescent Material; Fluonecent AN-N-11 Nut; Instrument Mounting AN-S-126 Screw-Threads; Strndrrd Aircraf
4、t Anodic-Films 3 Corrosion-Protective (For) Alumi- num Alloys , U* S. Anri;y 94-40645 Marking; uterior, Domestic and Export Shipment, by contractow i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-68118 bb 3779706 0325757 O Bureau of supp lies
5、 and Accounts Navy Shipent Marking Handbook 2.1.3 D18Wit* Air Force-Navy Aeronautical Standard Drawings AN5727 AN5745 Accelerometer - Aircraft . AND10400 AND10404 Olase - Aircraft Instrument. Cover Numerals and Letters - Aircrait Inetniment Pointers - Standard Design of AircraPt (Copies of this spec
6、ificstion and copies of other publicaticm referenced herein or muired for Oovemnt procurement, and the Index o$ MilitaW. Aeronautioal (AN or ?EL) Standarde, my be obtained upon application to the Commanding General, Air Pateriel caamuuid, Wright-Patterson Air Force Base, Dayton, Ohio; or the Command
7、ng Officer, U. S. Naval Air Station, Johnsville, Pennsylvania. ) Dial, Standard Fo Of nstrument 3.1 Materials.- . 3.1.1 Hetals.- Metae shall be of the corrosion-resisting type, wileas suitably proteated to recomosion durin one main pDinter for indicating instantaneous acceleration, and two auxiliam
8、pointers, one for indicating maKi- mum positiva acceleration, and one for indicating maximum negative acceleration pointers shall conform to figure 1. oscillation under vibration. readily adJustable. Th They shall be light and sufficiently rigid to pmvent They shall be firmly attached to the mechani
9、sm, yet shall be 3.3.6 Ratchet Mechanism.- Each auxiliary painter shall be provided with a ratchet device so that indication of the maximum plus and minus deflections of the main pointer vsilP be maintained until the auxiliary pointers are released to obtain a new reading. 3.3.7 auxiliary Pointer Re
10、turn Mechanism.- A mechanism shall be provided-for 18- leasing the auxiliaw pointers for return into juxtaposition with the main pointer. knob located as shown on Drawing AN5745 of the size and shape specified thereon, and made of molded plastic or low-density alloy metal, shall be provided for oper
11、ating the return mechanism. indicate a lower or higher reading than that indicated by the main pointer. Stops shall be a past of the mechanism connecting the pointers and shall not directly engage them. A Stops shall be provided so that the auxiliary pointers when released shall not 3.3.7.1 pointers
12、 when the imposed acceleration is less than the acceleration indicated by the auxiliary pointers . Stops for Acceleration-Responsive Element .- Mechanical stops shall be pro- vided for arresting the motion of the acceleration-responsive element when the inst-ent is subjected to accelerations beyond
13、the limits specified. One stop shall engage the ele- ment at an acceleration of not less than -5.1 g units and not more than -5.5 g units, and the other at an acceleration of not less than +12J g units and not more than +12.5 g units; The main pointer mechanism shall not engage the mechanism of the
14、auxiliary 3.3.8 .- 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-P MIL-A-6Y 66 7977906 0125762 O to proteci the mechanism of the instrument from pos
15、sible damage during shipment. vided. this device shall be controlled by mans of a screw located in the back of th% case. If pro- 1 3.3,10 Ad u6tment.- The mechanism shall be provided with means to adjust or cor- rect the pointer -4-T ndica ions if this becomes necessary during the service of the ins
16、tru- ment. This means of adjustment shall be reasonably simple to manipulate and of such nature I the adjustment can be accomplished with tools ordinarily possessed by an instrument repairman. thon and parformance. Changea in manufacturerts part nuhers shall be governed by the I drawing number requi
17、rements of Specification MIL-D-5028. v ._ - requirements of this specification. chip, or peale during normal service life or due to extremes of atmospheric conditions shall w:ii be used. Protective coatings and finishes whibh will crack, 3.7.1 Aluminum and AluMnUm-AllOY Parts.- Aluminum andaluminum-
18、alloy parts shall ps covered with an anodic film conforming to Specification AN-QQ-A-646, except that the ).dial and small holes need not be anodized. Steel Parts.- Cteel parts shall be cadmium-plated, where practicable, in jO72 3.8 Performance .- The instrument shall satisfy the performance require
19、ments accordance with specification QQ-P-b6. specified in Section 4, when subjected to the applicable tests. 3-9 HarkinEs.- Ap1 markinas shall be durable to withstand iisaue anrniint.arat .in 3.9.1 Doal and Pointers.- The dial and pointers shall be marked as shown in figurn l. sgnfom to Drawing A“D1
20、0400. Fluorescent-luminescent material shall conform to Specifica- tion AN- AIRCRAFT AY5745 (proper dash number) Stock No. (USAF or Navy, as applicable) Manufactureris Part No. Manufactureris Serial No. L/ Contract or Order No. Manufacturer 1s Name or Trade-Mark u s propert$ Provided by IHSNot for R
21、esaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-bq bb m 99979Ob OL257b3 2 m QL-A-6 848 (August 1950) 3.10.2 Use of AN or MIL Designations.- AN or NIL designations shall not be applied to a product, except for Qualification test samples, nor referred to in corresponden
22、ce or sales matter, until notification has been rw! 4.3.2.12 Fungus Resistance.- At least five fungi shall be used in each test. Five graups of fungi a-d one type of fungus from each group shall be wed. The 1 following solution shall be used for preparing the spore suspensionst Distilled water 100-
23、ml Wetting agent in non-toxic concentration 0.05 gram (dioctyl sodium sulposuccinate) This solution shall-be prepared for use by sterilization in convenient containers (approxi- mately 100 eash). a stock wlt AIRCRAFT AN5745- (proper dash number) Stock No.(USAF or Navy, as applicable) Manufacturer18
24、Part No. Manufacturers Serial No. I/ Name of HanufactureF Name of Contractor (U different iroa manufacturer) Contract or Order Ho. IF IN STORAGE AITER (DATE)* THE IIELIMTE 1NSTR“ HANDLE WITH CARE FRAOILE 6,i 6.2 Intended Use,- Accelerueters covehd by this specification are for uae on air- .Ordering
25、Data.- Requistions, contracts, and orders should state the AN part (see craft to indhate acceleration in LBBnBuvers and in rough air, number of the instrument desired, and whether ovemeas packing is to be furnished. test reports showing conformance with all the requirements of this specification and
26、 the manufacturerte assembly and detail drawings, and for information as to the rnarking and for- warding of samples should be addressed to the Commanding Genera., Air Materiel Conmiand, Wright-Patterson Air Force Base, Dwton, Ohio; or to the Bureau of Aeronauties, Navy Depart- mnt, Washlngton 25, D
27、. 6.# the Qualifying Services, with a copy to the other Servce. gles shall be furnished at no cost to the Government, and the manufacturer shall pay the transportation charges to and from the designated point where tests are to be made. case of failure of the sample or samples submitted, cosideratio
28、n will be given to the re- quest of the manufacturer for additional tests only after it has been clearly shownthat changes have been made in the product which the Government considera sufficient to warrant 6.3.1 It is to be understood that upon receipt of the Letter of Authorization, sau- In the : a
29、dditional. tests, 6.3.2 It is to be understood that accelerometers supplied under contract shall be identical in every respect to the samples tested and found satisfactory, except for changes PmViously approved by both Services. AI unapproved changes from the qualification sample 8hsll constitute ca
30、uee.for rejection, are.given below: 6,4 Sources for hingi.- Sources of the fungi listed in the Fungus Resistance test source - PQMD Uic: Philadelphia O.M. Depot, 2800 South 20th Street, Phiiadelphia, Air Materiel Commend, Hakrials Laboratory, Wright-Patterson Ar IUlSylVi8 Force Base, Dayton, Ohio /A
31、- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-USDA ATCC S,N. NOTICES when Govenunent drawings, speoifioations, or other data are used for any purpose other than in .connec%ion with a definitely related (3oov8mnt procurement operation, the United
32、States Government thereby incurs no responsibility nor any obligation whatsoever; and the fact that the Govern- ment MY have foxmulated, furnished, or in any way supplied th0 said drawings, specifications, or other data is not to be regarded by implication or otheiwise as in any manner licensing the
33、 holder or any other person or corporation, or conveying any rignts or permission to manufacture, use, or sell any patented invention that may in any way be related thereto, American Type Culture Collection, 229 M Street, N.W., American Type Culture Collection, 2029 M Street, N.W., American Type Culture Collection, 229 M Street, N.W., Washington 6, D. C. Washington 6, D. C. Washington 6, D. C. Custodian: Air .Force Other intereat4 Navy - BuAer i I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
