1、i . t.-/g- w I MIL-I-580b7A bb 77777Ob 0342444 5 MIL-I-58067A(AV) 21 April 1977 Superseding 8 May 1963 MIL-1-58067 (MO) MILITARY SPECIFICATION INDICATOR, VERTICAL VELOCITY, RAPID RESPONSE ACCELERATION SENSITIVE GENERAL SPECIFICATION FOR This specification is approved for use by US Army Aviation Syst
2、ems Command, Department of the Army, and is available for use by all De- partments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers a rapid response acceleration- sensitive vertical velocity indicator. 1.2 Classification. Indicator shall be of the following ty
3、pes, as specified (see 6.2). Unless otherwise specified, Department of Army aircraft requirements are lusterless white indicators without lights. MS25454-1 - Range O to 3000 feet per minute with integral lighting and lusterless white finish (Fig 1). MS25454-2 - Range O to 6000 feet per minute with i
4、ntegral lighting and lusterless white finish (Fig 2). MS25454-3 - Range O to 3000 feet per minute without integral light- ing and with fluorgscent luminescent finish (Fig 1). MS25454-4 - Range O to 6000 feet per minute without integral light- ing and with fluorescent luminescent finish (Fig 2). MS25
5、454-5 - Range O to 3000 feet per minute without integral light- ing and with lusterless white finish (Fig 1). MS25454-6 - Range O to 6000 feet per minute without integral light- ing and with lusterless white finish (Fig 2). Beneficial comments (recommendations, additions, deletions) and any pertinen
6、t data which may be of use in improving this document should be addressed to: US Army Aviation Systems Command, P.O. Box 209, Main Ofc, St. Louis, Missouri 63166 by using the self- addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by lett
7、er. FSC 6610 TH18 DOCUMENT CO“VAIN% a PAGES. Licensed by Information Handling ServicesMIL-1-58067A 66 m 7777906 0142L1L15 7 MIL- 1-5 8 O 6 78 (AV) 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the spe
8、cification to the extent specified herein: SPECIFICATIONS FEDERAZ, DD-045 1 QQ-C-320 QQ-N-2 9 O QQ-P-4 16 PPP-B-60 1 PPP-B-621 PPP-B-636 MILITARY MIL-P-116 MIL-D- 1000 MIL-M-3171 MIL-N-3336 MIL- C- 5 5 4 1 MIL-S-6872 MIL-S- 7 7 42 Glass, Flat and Corrugated, for Glazing, Mirrors and Other Uses. Chro
9、mium Plating (Electrodeposited). Nickel Plating (Electrodeposited). Plating, Cadmium (Electrodeposited). Boxes, Wood, Cleated Plywood. Boxes, Wood, Nailed and Lock-Comer. Box, Fiberboard. Preservation, Method of. Drawings, Engineering and Associated Lists. Magnesium Alloy, Processes for Pretreatment
10、 and Prevention of Corrosion on. Nut, Self-Locking, Instrument Mounting. Chemical Films for Aluminum and Aluminum Alloys. Soldering Process, General Specification for. Screw Threads, Standard, Optimum Selected Series, General Specification for. 2 ! O Licensed by Information Handling Servicesi MIL-1-
11、58 06 79 (AV) MIL-A- 86 25 MIL-014806 MIL-L-25142 MIL-L-2546 7 MIL-W45202 STANDARDS FEDERAL FED STD Nor 1 Anodic Coatings for Aluminum and.Aluminum Alloys. Coating, Reflection Reducing, for Instrument Cover Glasses and Lighting Wedges. Luminescent Material, Fluorescent. Lighting, Integral, Aircraft
12、Instrument, General Specification for. Magnesium Alloyk, Anodic Treatment of. . -.- _. Standard for Laboratory Atmospheric Conditions for Testing. FED STD No. 595 Colors. MILITARY MIL-STD- 129 MIL-STD- 130 MIL-STD-143 MIL-STD-810 MIL-STD-83 1 MIL-STD-838 MIL-STD-889 FE3134 MS25454 Marking for Shipme
13、nt and Storage. Identification Marking of US Military Property. Specifications and Standards, Order of Precedence for the Selection of. Environmental Test Methods. Test Reports, Preparation of. Lubrication of Aircraft. Dissimilar Metals. Connector, Receptacle, Electric, Solder Type, Single Hole Moun
14、ting, Push Pull Coupling. Indicators, Vertical Velocity, Rapid Response, Acceleration Sensitive. - 9 .Y o Licensed by Information Handling ServicesI i NIL-I-SOb7A bb m 7997706 0142453 b m MIL-1-5 80 6 7 A(AV) 4.2.2.1 Individual. Each indicator shall be submitted to the individual tests speficied bel
15、ow. Any indicator failing to pass any of these tests shall be rejected. (a) Examination of product (see 4.4.1). (b) Zero setting (see 4.4.2). (c) Leakage (see 4.4.3). (d) Scale error at room temperature (see 4.4.4). (e) Pointer lag (see 4.4.5). (f) (8) Position error (see 4.4.8). Illumination (for D
16、ash 1 and Dash 2 only of MS25454) (see 4.4.7.2). 4.2.2.2 Sampling tests. The test samples selected for sampling tests shall first have passed the individual tests. have been subjected to sampling tests shall not be delivered on contract until they have been refurbished and resubjected and passed all
17、 the individual tests. The test samples which 4.2.2.2.1 Sample test sample selection. Sampling test samples shall be selected at random in accordance with the following schedule: QUANTITY OF INDICATORS OFFERED FOR ACCEPTANCE FOR TESTING QUANTITY TO BE SELECTED First 15 1 Next 50 1 Next 75 1 Next 100
18、 1 Each additional 200 or 1 fraction thereof 4.2.2.2.2 Sampling test defects. When a defect occurs, no items from those still on hand or later produced shall be accepted until the extent and cause of failure have been determined and appropriately corrected. In addition, when a failure occurs, shift
19、to one sample out of the first fifteen and proceed as indicated. 4.2.2.2.3 Sampling tests. Sampling tests shall include: (a) Illumination (for Dash 1 and Dash 2 only of MS25454) (see 4.4.7.3). (b) High temperature (see 4.4.9). (Cl Low-temperature zero error (see 4.4. io). (d) Scale error during temp
20、erature change (see 4.4.10.1) . 10 f -*=- Licensed by Information Handling Services MIL-I-5067A 66 W 3377706 03q24.54 i MIL-I-58067A(AV) (e) Low-temperature scale error (see 4.4.10.2). (f) Zero error during temperature change (see 4.4.11). (g) Vibration error (see 4.4.12). (h) Over pressure (see 4.4
21、.13). (i) Weight (see 4-.4.22). 4.3 Test conditions. 4.3.1 Atmospheric. Unless otherwise specified herein, all tests shall be made under atmospheric conditions specified in FED-CTD-1. conditions stated in MiL-STD-810. Ambient 4.3.2 Tapping. Unless otherwise specified, the indicator shall be tapped b
22、efore a test reading is taken. 30 to 60 cycles per second (cps) with a maximum amplitude of 0.002-inch when attached to the test item may be used. An electrical vibrator set at 4.3.3 Vibration stand. Whenever a vibration stand is specified (see 4.4. 121, it shall be a device which will vibrate at an
23、y desired frequency be- tween 2.5 and 50 cps, constantly varying the amplitude from .25-inch at 2.5 cps to .020-inch at 50 cps. 4.3.4 Position of indicator, Unless otherwise specified herein, the indicator shall be tested in its normal operating position with the dial vertical. 4.4 Test methods. 4.4
24、.1. Examination of product. The indicator shall be inspected to determine compliance with this specification with respect to materials, workmanshJp, and marking. 4.4.2 Zero setting. range in both the Up and DOWN directions. movement shall be not less than 400 feet per minute (fpm) Up, to not less th
25、an 400 fpm DOWN. The adjusting screw shall be moved throughout its The adjustable range of pointer 4.4.3 Leakage. suitably connected to a mercury manometer and sources of vacuum and pressure. connection at a rate not exceeding 20,000 fpm. the difference between the mercury levels in the manometer du
26、ring a period of 1 minute shall not exceed 0.05-inch Hg. The static pressure connection of the indicator shall be A vacuum of 15 inches Hg shall be applied to the static pressure With the source closed off, The same procedure shall then ,. .- - 11 “A Licensed by Information Handling ServicesI MIL-I-
27、58067A 66 7777706 0342455 T MIL-1-5 8067A(AV) be repeated with a pressure of 10 inches Hg. The same tolerance shall apply 4.4.4 set to zero, shall be placed in an altitude chamber. A mercury barome- ter shall be connected to the chamber. Pressure shall be reduced at a rate such that the pointer indi
28、cates 500 fpm. While the pointer indi- cates 500 fpm, time required for the mercury barometer to change from a pressure corresponding to 1,000 feet altitude to that of an altitude of 1,500 feet shall be determined by a stop watch. Pressure shall then be increased at such a rate that the pointer will
29、 indicate a descent of 500 fpm and the time required for the barometer to change from 1,500 feet altitude to 1,000 feet altitude determined. This procedure shall be continued for the test rates and altitudes shown in Table I. Scale error shall not exceed the tolerances listed in Table I. Scale error
30、 at room temperature. The indicator, with the pointer 4.4.4.1 Scale error determination. When testing several instruments in one chamber at the same time, one instrument may be selected to indicate the test rate. This test rate shall be maintained at a constant value while test readings of all instr
31、uments are observed and noted, and while the time and altitude interval on the barometer are noted. The computed rate shall be obtained. Scale error shall be determined. 4.4.5 Pointer lag. The static pressure connection of the indicator shall be suitably connected to a water manometer and sources of
32、 vacuum and pressure. A vacuum shall be carefully applied to the static pressure connection (the indicator will show a rate of ascent) sufficient to cause the pointer to indicate a descent of more than 3,000 fpm, after the pointer has passed through the zero position when this vacuum is instan- tane
33、ously released by opening the static pressure tubing to atmosphere. The indicator shall be tapped during the return of the pointer to zero. A stop watch shall be started at the instant the pointer passes the 3,000 fprn graduation and stopped when the pointer passes the 300 fpm graduation. This proce
34、dure shall be re- peated, except that a slight pressure shall be carefully applied to the static pressure connection and the time determined for the indication to change from 3,000 fpm climb to 300 fpm climb. The time recorded shall be not less than 7 seconds nor more than 12 seconds. During this te
35、st and at any time after vacum (or pressure) is released, the pointer shall move smoothly without excessive friction. The time shall be recorded. 12 O Licensed by Information Handling Servicesal k 7 ci td k al a E al i3 E O 2 ci td thereafter, the maximum reading shall not ex- ceed 200 fpm. 4.4.12 V
36、ibration error. The indicator shall be mounted on a vibration stand in its normal operating position with the dial vertical, test, the pointer shall be set to zero. No pressure or vacuum shall be applied during the test. The indicator shall be subjected to vibration with an amplitude between 0.003-
37、and O.OQ5-inch at frequencies of 5 to 50 cps in order to determine that natural frequency of the indicator does not occur in this frequency range. maximum range of pointer oscillation at any time shall not exceed 50 fpm. Pointer variation from the zero position shall not exceed 50 fpm. For this Whil
38、e the indicator is being vibrated, 4.4.13 Overpressure, -With the indicator in an altitude test chamber after the pointer has been set to zero, the pressure shall be decreased at the rate of 15,000 fpm for MS25454-1 and -3 or in nailed wood boxes conforming to Class 2 of PPP-B-621. pack shall not ex
39、ceed 200 pounds. Gross weight of the 5.2.2 Level B. except that fiberboard boxes conforming to VS, VS, or V3c of PPP-B-636 may be used. Indicators shall be packed as for level A (see 5.2.1) 5.2.3 Level C. Indicators shall be packed in a manner to assure carrier acceptance and safe delivery to destin
40、ation. 5.3 Marking. order, interior and exterior containers shall be marked in accordance with In addition to any special requirements of the contract or MIL-STD-129. 5.3.1 Precautionary markings. Whenever practicable, the following pre- cautionary markings shall appear on two opposite sides of each
41、 interior package and shipping container: FRAGILE, DELICATE INSTRUMENT(s), HANDLE WITH CARE. 6. NOTES 6.1 Intended use. The acceleration-sensitive rapid response vertical velocity indicator is intended for use on aircraft to indicate the ver- tical component of the aircrafts speed based on the rates
42、 of change of atmospheric pressure and the effects of vertical acceleration. 6.2 Ordering data. Procurement documents should specify the following: (a) Title, number, and date of this specification. (b) Type of indicator required (see 1.2). (cl Level of packaging and of packing required (see 5.1 and
43、 5.2). (d) Whether special markings are required (see 5.3). (e) When a first article is required for inspection and approval (see 3.1, 4.2.1, and 6.4). 6.3 Definitions 6.3.1 Amplitude. Extent of motion as measured from one extreme to the opposite extreme. 19 , -. Licensed by Information Handling Ser
44、vicesMIL-I-58067A bb = 77777Ob 0342463 7 MIL-1-5806 7A(AV) 6.3.2 Test reading. Indication of the instrument during the test. 6.3.3 Test rate. The rate at which the instrument is to be tested ias specified in Column 2 of Tables I and II. 6.3.4 Computed rate. (2,000 feet as measured by a barometer) by
45、 the time in seconds (required for the change in altitude) and multiplying by 60. The rate computed by dividing the altitude interval Altitude interval X 60 Computed rate- . Time in seconds 6.3.5 Computed rate correction. The algebraic difference between the test rate and the computed rate is “compu
46、ted rate correction.“ Example 1. Example 2. Test rate + Computed rate + Computed rate correction Test rate + Computed rate + Computed rate correction 2 , O00 1,925 + 75 2,000 2,025 - 25 6.3.6 Indicated rate. The reading of the instrument as computed-herein to correspond to a “test rate.“ should be c
47、omputed by adding algebraically the test reading of the instru- ment and the computed rate correction. The indicated rate of the instrument 6.3.7 Scale error, “indicated rate“ is the “scale error .I1 The difference between the “test rate“ and the 6.4 First article inspection. When a first article is
48、 required, it shall be tested and approved under the appropriate provisioiis of 7-104.55 of the Armed Services Procurement Regulation. be a sample selected from the first 3 production items, or it may be a standard production item from the contractors current inventory as specified in 4.2.1. contrac
49、ting officer should include specific instructions in all pro- curement instruments, regarding arrangements for examinations, test and approval of the first article, Invitation for bids should provide that the Government reserves the right to waive-the requirement for samples for first article inspection as to those bidders offering a product which has been previously procured or tested by the Government, and that bidders offering such products, who wish to rely on such production or The first article should The first article should consist of 3 units. The 20 r
