1、AlLi54 66 m O6 0243287 2 MIL- 1-81454 (AS) 15 JANUARY 1967 MILITARY SPECIFICATION INDICATOR, GYROSCOPE # VERTICAL RFFERENCE p)-48l(W)/A This specification has been approved by the Naval Air Systems Command, Department of the Navy. 1. SCOPE 1.1 Scope - This specification covers design and all per- fo
2、rmance requirements of a self-contained attitude indicator for aircraft use. 1.2 Classification - The equipment covered by this specifi- cation shall consist of the following items: I tem Type Designation - Indicator, Attitude Self -con ta ined ID-l481/A 2. APPLICABLE DOCUMENTS 2.1 General - The fol
3、lowing documents of the issue in effect on the date of invitation for bids, form a part of this specification, to the extent specified herein. SPEC IF ICATIONS - Military MIL-P-116 MIL-C-4150 MIL-W-5088 MIL-E-5272 Preservation, methods of Case, Carrying, Water-vaporproof Wiring; Aircraft, Installati
4、on of Environmental Testing, Aeronautical and Associated Equipment, General Specification for FSC 6610 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-1-41454 66 m 7777906 0/43270 7 M I. MIGI-81454 (AS) MIL-E- 5400 Electronic Equipment, Aircra
5、ft, General Specification for MIL-T-5422 Testing, Environmental, Aircraft Electronic Equipment MIL- 1-6181 Interference Control Requirements, Aircraft Equipment MIL-T-18303 Test Procedures; Preproduction and Inspection for Aircraft Electronic Equipment, format for Aeronautical Electronic and Associ-
6、 ated Equipment MIL-N-18307 Nomenclature and Nameplates for MIL-L- 2 5467 STANDARDS Federal FED-STD-209 FED-STD- 5 95 Military MIGSTD-12 9 MIL-STD-704 MI G S TD-7 8 1 MIL-STD-794 Lighting, Integral, Aircraft, General Specification for Clean Room and Work Station Require- ments, Controlled Environmen
7、t colors . Marking for Shipment and Storage Electric Power, Aircraft, Character- istics ana utilization 01 Reliability Tests,Exponential Distribution Parts and Equipment, Procedures for Packaging and Packing of 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
8、om IHS-,-,-. MIL-1-83454 66 7777906 0343273 O MIL-1-81454 (AS) MS3112 MS33558 Connec tor, Receptacle,. Electric I Box Mounting Numerals and Letters, Aircraft Instrument Dial, Standard Form of 2.1.1 Availability of Documents - When requesting specifications, standards, drawings, and publications refe
9、r to both title and number. Copies of this specification and applicable specifications required by contractors in connection with specific procurement functions may be obtained upon application to the Commanding Officer, Naval Supply Depot, Code 1058 5801. Tabor Avenue, Philadelphia, Pennsylvania 19
10、120. 3. REQUIREMENTS 3.1 Preproduction - This specification makes provision for preproduction testing. 3.2 Parts and Materials - In the selection of parts and materials fulfillment of major design objectives shall be the prime consideration. Parts and materials shall, where possible, conform to Spec
11、ification MIL-E-5400. 3.2.1 Nonstandard Parts and Materials Approval - Approval for the use of nonstandard parts and materials shall be obtained as out- lined in Specification MIL-E-5400. . 3 -i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-8
12、1454 (AS) 3.3 Desiqn and Construction - The equipment shall conform with all the applicable requirements of Specification MIL-E-5400 for design, construction and workmanship, except as otherwise specified herein. 3.3.1 Total Weiqht - The total weight of theequipment, excluding cables, shall be.rimin
13、imum consistent with good design and shall not exceed 2.50 pounds. 3.3.2 Reliability - 3.3.2.1 Op erational Stability - The equipment shall operate with satisfactory performance, continuously or intermittently for a period of at least 500 hours without the necessity for readjust- ment of any control
14、s which are inaccessible to the operator during normal use. 3.3.2.2 Op eratinq Life - The equipment shall have total operating life of 5,000 hours with reasonable servicing and replace- ment of parts. specified by the contractor. Parts requiring scheduled replacement shall be 3.3.2.3 Reliability in
15、Mean Time Between Failure (MTBF) - The equipment shall have 1,500 hours of mean (operating) time between failures when tested and accepted as outlined under the requirements of 4.4.3. 3.3.3 Cablinq and Connections - 3.3.3.1 Cables and Connectors - The equipment shall provide for the use of cables an
16、d connectors in accordance with Specification MIL-E-5400 . - 3.3.3.2 Interconnection Cabling - The equipment shall be capable of satisfactory operation using external wiring in accord- ance with the applicable requirements of Specification MIL-W-5088 and Figure I. The external wiring shall be unshie
17、lded, except that a minimum of the individual wires may be shielded when demonstrated as necessary to meet interference control requirements and provided the assembly of the cable to its plugs may be easily accomplished. External cables and that portion of the connectors attached to the cables shall
18、 not be supplied as part of the equipment. 4 .-. :i ; _. i“ .- i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-1454 66 m 9999906 011i3293 4 M MIL-1-81454 (AS) 3.3.4 Interchanqeability of Re-ordered Equipment - For re- ordered equipment interc
19、hangeability shall exist between units and all replaceable assemblies, subassemblies, and parts of a designated model of any previously manufactured equipment, supplied or designated by the procuring activity. 3.3.5 Interference Control - The generation of radio inter- ference by the equipment and t
20、he vulnerability of the equipment to radio interference shall be controlled within the limits of Specification MIL-1-6181, 3.3.6 Maintenance Provisions and Field Testing - Provisions for maintenance shall be as specified in Specification MIL-E-5400. 3.3.7 Nomenclature and Nameplates - Nomenclature a
21、ssignment and nameplate approval for equipment identification shall be in accordance with Specification MIL-N-18307. 3.3.8 Standard Conditions - The following conditions shall be used to establish normal performance characteristics under standard conaitions and for making laboratory bench tests. Tem
22、perature Room Ambient (25OC 2 5OC) Altitude Normal ground Vibration Humidity None Room ambient up to 90% relative humidity Input power voltage 115 2 1.0 V 3 Phase AC and 5.0 2 0.5 V AC/DC - 3.3.9 Service Conditions - The equipment shall operate satis- factorily under any of the environmental service
23、 conditions or reasonable combination of these conditions as specified in Specifi- cation MIEE-5400 for Class 2 equipment, except as modified herein: 3.3.9.1 Vibration - The indicator shall operate satisfactorily while being subjected to vibration requirements of Curve II of Specification MIL-E-5400
24、. 3.3.10 Warm-Up-Time - The time required for the equipment to . -1- , 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-I-AL454 66 M 997770b 0143294 b -p.- MIGI-81454 (AS) warm up prior to operation shall be kept to a minimum and shall not excee
25、d 3.5 minutes under standard conditions and 5.0 minutes at extreme service conditions. 3.3.11 Primary Input Power Requirements - The power supply to the indicator shall be 400-cycle three-phase 115 v line-to-line with phase sequence ABC. 3.3.11.1 Electrical Power Variations - The indicator shall fun
26、ction satisfactorily with variations in voltage from 103 to 123 and in frequency between 380 and 420 cps, in addition to the transient variations specified in MIL-STD-704. 3.3.11.2 Deqraded Performance - Degraded performance will be permitted for voltage transients not exceeding 0.5 seconds during n
27、ormal electric system operation. with no resulting damage to the equipment. Operation shall return to normal 3.3.12 Wiring - The internal electrical wiring of the indicator shall be insulated from its case. The external wiring shall be in accordance with Figure I. 3.3.13 Insulation Resistance - The
28、insulation resistance of the indicator must be 50 megohms or more when 500 volts DC is applied between isolated electrical circuits and between electrical circuits and the chasis. 3.4 Performance - Unless otherwise specified, values set forth to establish the requirements for satisfactory performanc
29、e apply to performance under both standard and extreme service con- ditions. When reduced performance under the extreme conditions is acceptable, tolerances or values setting forth acceptable variations from the performance under the standard conditions will be specified. -3.4.1 Operation - fie indi
30、cator shall provide accurate visual presentation of aircraft displacement in the roll and pitch axes which are referenced to gravity, without requiring inputs from any external source other than power supply. 3.4.1.1 Accuracy - The indicator, when connected and operated at standard conditions, shall
31、 provide a pitch and roll accuracy of 0.25 degrees maximum. 3.4.1.2 Performance at Environmental Extremes - Performance 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-81454 (AS) deviations at environmental extremes shall be permitted as spec
32、ified in the detail requirements. 3.5 Detail Requirements - 3.5.1 Desiqn and Construction - The indicator shall comprise a 115 v three-phase 400 cycle operated vertical gyro mounted in a case with its outer gimbal axis fore-and-aft, and its inner gimbal axis athwartships. The vertical gyro shall be
33、referenced to gravity with compensation for acceleration resulting from turns and fore and aft velocity changes. A moveable roll index shall be fixed to the outer gimbal; the index shall move over a scale fixed to the case. A moving drum, mechanically driven by the inner gimbal, shall register movem
34、ent in the pitch and roll axes with respect to a miniature airplane mounted on an adjustable bracket and located at the center of the indicator glass cover. The attitude presentation shall be 360 degrees roll, 92 degrees climb and 78 degrees dive. The indicator shall be adjusted to indicate zero pit
35、ch when mounted with the case at an angle of 7 degrees from the vertical with the connector end of the indicator rotated downward. Rotation of a knob, located on the bezel, shall adjust the position of the miniature airplane to a maximum of five degrees in dive or climb. Pulling the knob shall cage
36、the gyro in pitch and roll: rotating the knob clockwise while it is fully out shall lock the gyro in the caged position. A warning flag shall come into view when the gyro is caged, or if the AC power supply is interrupted. The indicator shall withstand the temperature extremes, the strains, jars and
37、 vibrations incident to shipping, storage installation and service. 3.5.1.1 Liqhtinq - The attitude Indicator shall be provided with integral lighting in accordance with MIL-L-25467. 3.5.1.2 Indicator Display - The display shall be in accordance with Figure 2, and shall consist basically of a miniat
38、ure airplane, a bask angle dial, bank index, and a moving two-colored drum back- ground with a distinct horizon line dividing the two colors. Unless otherwise specified, all colors shall be in accordance with FED-STD-595, with all visible portions of the indicator case being black Color No. 37038. T
39、he finish shall diffuse light sufficiently to avoid “HIGH-LIGHT“ when illuminated with external or internal light sources . 3.5.1.2.1 Graduations, Lines - All markings of the indicator display shall be clean and sharp. Dimensions shall be as specified 7 _- - _.E Provided by IHSNot for ResaleNo repro
40、duction or networking permitted without license from IHS-,-,-g327b T MIL-1-81454 (AS) and on any given mark specified. indication, become adjacent and which are specified to have the same basic dimension at the adjacent points shall not be noticeably different at that point. All markings which for s
41、ome given 3.5.1.2.2 Miniature Airplane - The miniature airplane shall be in accordance with Figure 6. plane shall be within 1/16 inch of the drum surface. The rear edge of the miniature air- 3.5.1.2.3 Bank Anqle Dial - The bank angle dial shall be in accordance with Figure 4. white Color No. 37875 o
42、f FED-STD-595. The scale markings of the dial shall be 3.5.1.2.4 Bank Index - The bank index shall be in accordance with Figure 5. The index shall not move with pitch deviations. shall be within 1/32 2 1/64 inch of the small diameter edge of the scale surface of the bank angle dial. At zero roll ind
43、ication the bank index shall be aligned with and radially within 1/32 5 1/64 inch of the zero roll marking on the bank angle dial. The index shall be white Color No. 37875 of FED-STD-595. It shall be affixed to rotate with the roll gimbal. The bank index 3.5.1.3 Drum - The drum shall be mounted on t
44、he roll gimbal and shall rotate with the gimbal about the roll axis for roll indications, and rotate in relation to the roll gimbal about the pitch axis for pitch indications. The roll axis shall be perpendicular to the face of the indicator, the pitch axis shall be horizontal when the indicator is
45、level and is indicating a zero roll attitude. The horizon line on the drum shall be at the zero pitch position. the case is inclined, with the connector end down, at an angle of 7 degrees from the horizontal. The drum shall be driven in pitch in such a way that for a dive maneuver the horizon line g
46、oes above the miniature airplane and for a climb maneuver the horizon line goes-below the miniature airplane. with Figure 7. inch for each degree of pitch change. The zero pitch position shall be indicated when me drum shall be in accordance The surface of the drum shall move ,026 (nominal) 3.5.1.3.
47、1 Marking and Colors - The drum shall be marked as shown in Figure 7. Color No. 36440 and all markings shall be black Color No. 37038. The horizon line shall be white Color No. 37875. Below the horizon line the drum shall be black Color No. 37038 and all markings shall be-white Color No. 37875. Abov
48、e the horizon line the drum shall be gray The lengths of the major Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-1-81454 bb = 3797706 01q3297 1 W - MIL- 1-81454 (AS) pitch lines shall be as follows: Oo (Horizon Line loo 20 30 40 50 60 70 80 T
49、he center of the dots shall be the extreme pitch position and from center to center shall represent 180 degrees of pitch indication. The pitch indication shall be linear over the full range and shall be spaced in accordance, Figure 7. 3.5.1.3.2 Numerals and Letters - All numberals and letters on the indicator shall be in accordance with MS33558. 3.5.1.4 Attitude Actuation - The drum shall be rotated about t
