1、F MIL-PRF-8528LC m 9997906 2066738 581 m i 1 INCH-POUND I 20 Julv 1998 SUPERSEDING 30 August 1991 MIL-PW-8528 lC(AS) MIL-H-8528 lB(AS) PERFORMANCE SPECIFICATION HORIZON REFERENCE SET, SHIP MOUNTED FOR LAMPS MK III HELICOPTER This specification is approved for use by the Naval Air Systems Command, De
2、partment of the Navy, and is available for use by ali Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification establishes the performance and test requirements for a helicopter Horizon Reference Set (HRS). 2. APPLICABLE DOCUMENTS 2.1 General. The documents liste
3、d in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, documen
4、t users are cautioned that they must meet ail specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards form a part of this document to the
5、 extent specified herein. Unless otherwise specified, the Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Air Warfre Center Aircraft Division, Code 4141OOB120-3, Highway 547, La
6、kehurst, NJ 08733- 5 100, by using the Standardization Document Improvement Proposai D Form 1426) appearingat the end of this document or by letter. AMSCNA FSC 1710 Distribution Statement A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or netwo
7、rking permitted without license from IHS-,-,-MIL-PRF-8528LC = 9999906 2066739 4L8 t I MIL-PRF-8528 lC(AS) issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation (see 6.2). S
8、PECIFICATIONS DEPARTMENT OF DEFENSE MIL-s-90 1 - Shock Tests HI olugh Impact) Shipboard Machinery, MIL-S-20708 - Synchros, General Specification for MIL-L-24560/1 - Light, Aircraft Warning, Red, 120 Volts, 90 Watts, Six Lamps, Symbol 160.1 Equipment and Systems, Requirements for STANDARDS DEPARTMENT
9、 OF DEFENSE MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internaliy Excited) Application of Guidelines Interface Standard for Shipboard Systems, Section 3004 Electric Power, Alternating Current (Metric) Specifications MIL-STD-710 - Synchros, 60 a
10、nd 400 Hertz, Selection and MIL-STD-8 1 O - Environmental Test Methods and Engineering MIL-STD-1399/300- MIL-STD-2036 - General Requirements for Electronic Equipment (Unless otherwise indicated, copies of the above specifications and standards are available fiom the Standardization Document Order De
11、sk, 700 Robbins Avenue, Bldg 4D, Phiiadeiphia, PA 191 11-5094.) 2.2.2 Other Government documents. drawings. and publications. The foilowing other Government drawings form a part of this document to extent specified herein. Unless otherwise specjed, the issue is that cited in the solicitation. 2 Prov
12、ided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-PRF-85281C m 9999906 2066740 L3T m DRAWINGS NAVAIRWARCEN DRAWINGS 2 12602 - Electronic Components Assembly (HRS) 2 12603 - Control-Indicator (HRS) 212729 - Horizon Reference Set Outline and Installatio
13、n 520895 - Stabilization Data Indicator Outline and Installation 520896 - Electronic Components Outline and Installation 520897 - Control-Indicator Outline and Installation 621 154 - Foundation Assembly (HRS) (Copies of these drawings are available from the Commander, Naval Air Warfare Center Aircra
14、ft Division, Code 7252, Highway 547, Lakehurst, NJ 08733-5042.) 2.3 Order of precedence. In the event of a confiict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulat
15、ions unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.1.1. 3.2 Svstems description. The HRS shall provide a horizon reference which is independent of the ships roll
16、ing motion. The visual display shall be a roll-stabilized, lighted reference bar to be located near the top of the hangar face of LAMPS MK III ships. The display shall be in the same plane of vision as viewed by a LAMPS MK III SH-6OB helicopter pilot conducting a normal obstruction clearance scan du
17、ring landing approach and recovery operation. The set shall be composed of three separate components (see figure i). 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-85281C 999990b 20bb741 07b MIL-PRF-8528 lC(AS) z FIGURE 1. HRS ComDonents.
18、4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-PRF-85281C = 9999906 2066742 TO2 a. A stabilization data indicator assembly composed of a lighted reference bar and a bar drive mechanism. b. An electronic component assembly containing operatin
19、g controls and indicators. c. A control-indicator containing duplicate operating controls and indicators of the electronic component assembly for the remote control. 3.3 Performance characteristics. The HRS shall have the following performance characteristics. 3.3.1 Stabilization accuracy. The HRS s
20、hall be stabilized within the roll amplitude limits (see 3.3.3) to an accuracy within B.5“ of the input signal. 3.3.2 Servo drive characteristics. The maximum angular velocity of the servo system driving the reference bar shall be not less than 20“ per second, and the maximum angular acceleration un
21、der the same conditions shall be not less than 15“ per second per second. The servo system damping ratio shall be not less than 0.70 or greater than 0.95. The servo system shall withstand wind velocities of up to 100 knots when subjected to the wind velocity test specified in 4.3.3.7. 3.3.3 Roll amp
22、litude limits. The reference bar electro-mechanical drive shall incorporate adjustable roli amplitude limits, which shall provide for: a. A minimum operating limit of not greater than f17“ and a maximum operating limit of not less than SO“ from the installation vertical. Adjustment increments betwee
23、n the minimum and maximum limits shall be not greater than 1“. b. Inhibiting circuitry to limit reference bar rotation to not more than 1“ greater than the set operating limit. c. A positive reversal drive force if the reference bar rotation is more than 3“ f 1“ greater than the set operating limit.
24、 d. Mechanical stops to prevent further reference bar rotation greater than 8 f 1“ beyond the set operating limit. 3.3.4 System lock-up. The electro-mechanical drive system shall automatically align and lock the reference bar in a position parallel to the ships deck when the HRS is shut down. 3.3.5
25、Reference bar lighting. The reference bar shall be illuminated using electroluminescent lamps conforming to 3.4.4. The length of electroluminescent lighting on the bar shall be not less than 9 feet 6 inches and the width shall be not less than two inches; lighting discontinuities 5 Provided by IHSNo
26、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-8528 1 C(AS) between adjacent lamps shall be not greater than one inch. The intensity of the reference bar lighting shall be smoothly controlled from zero to maximum. 3.3.6 Fault detection and warning. The HRS s
27、haU incorporate provisions to monitor potential faults and provide automatic shut down and warning. 3.3.6.1 Fault detection. Monitoring shall detect the existence of any of the followhg faults: a. Partial or complete loss of the input signal from the ship?s gyro. b. A differential, after initial sta
28、bilization, of greater than two angular degrees for more than two seconds between the input signal and the reference bar position when the reference bar is within operating limits (see 3.3.3). c. Loss of 115 vac, 400 Hz input power to the set. d. Partial or complete failure of the internal power sup
29、ply. 3.3.6.2 Automatic shutdown. The presence of any of the system faults listed in 3.3.6.1 shall cause the HRS to automatically perform the following sequence: a. Immediately turn OFF the reference bar illumination. b. Immediately turn ON the red warning lamp. c. For a two degree emor (see 3.3.6.1b
30、), automatically align and lock the reference bar in a position parailel to the installation platform and remove power fiom the servo system within ten seconds. L. e. -a d. For all other fault conditions of 3.3.6.1, immediately remove power fiom the servo system and lock the reference bar in place.
31、3.3.6.3 Warning lamp. The warning lamp shall consist of an assembly conforming to ML-L-24560/1 and shall have its primary location atop the housing of the stabilization data indicator assembly. The cable to the warning lamp assembly shall be not less than two feet long to allow for alternate install
32、ation of the warning lamp assembly on the stabhtion data indicator assembly foundation (see 3.6.3). The intensity of the warning lamp shall be controllable fiom fbli brilliance to not less than 25 percent of the foot lambert output at fbli brilliance. 3.3.7 Operating control and indicators. The elec
33、tronic components assembly and the control-indicator shail have the following switches, controls, and indicators: 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-PRF-8528LC 9999906 2066744 885 MIL-PRF-8528 1 C(AS) a. Power switch with locdremo
34、te indicators b. Start switch with indicator c. Stop switch with indicator d. Reference bar stabilized indicator e. Reference bar locked indicator f. Fault indicator and reset switch g. Reference bar illumination intensity control h. Warning lamp intensity control i. Panel and indicator illumination
35、 intensity control In addition, the electronic component assembly shall have tue follow j. Display of reference bar position k. Test controls and indicators ng: 1. Indicators for 60 Hz and 400 Hz power for gyro signal reference voltage 3.3.7.1 LocaVremote control. Design of the HRS shall provide for
36、 control of the installed set fiom either the electronic component assembly or the control-indicator if installed. If the control-indicator is not installed, the electronic component assembly shall provide sole control when optional interconnections are installed as specified on NAVAIRWARCEN Drawing
37、 520896. 3.3.8. Phvsical characteristics. The HRS equipment shall conform to the interface criteria of figure 1. Weight and size of HRS components shall conform to the interface requirements of NAVAIRWARCEN Drawing 212729. 3.3.9 Reliability. The Mean Time Between Faiiures (MTBF) shall be equal to or
38、 greater than 500 hours (see 6.4.1). All failures shall be recorded. 3.3.10 Maintainability. 3.3.10.1 Mean Time To Repair (MTTR). For organizational maintenance 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-PRF-B.52BLC m 9999906 2066745 711 m
39、 L MIL-PRF-8528 1 C(AS) (see 6.4.3), the MTTR shall be not greater than 15 minutes (see 6.4.2). Maximum maintenance time for correction of a failure shall be not greater than 45 minutes at the 95th percentile of distribution (see 4.3.7). 3.3.1 1 Environmental service conditions. HELS equipment shall
40、 operate as specified when subjected to the following environmental service conditions: 3.3.1 1.1 Temperature ranges. Exposed equipment (see 3.3.1 1.1.1) shall be subjected to a temperature range of -28 to +65 “C (-1 8 to +149 OF). Sheltered equipment (see 3.3.11.1.2) shall be subjected to a tempera
41、ture range of O to +50 “C (32 to 122 OF). Exposed and sheltered, non- operating HRS equipment shall be subjected to a temperature range of -62 to +71 “C (-80 to +160 OF) (see 4.3.3.1 and 4.3.3.2). 3 -3.1 1.1.1 Exposed equipment. The stabilization data indicator, including the illuminated reference b
42、ar and the warning lamp, shall be classified as exposed equipment. 3.3.1 1-12 Sheltered equipment. The electronic components assembly and the control-indicator shail be classied as sheltered equipment. 3.3.1 1.2 Humidity. HRS equipment shall be subjected to the humidity conditions in 4.3.3.3 and sha
43、ll maintain specified pdormance parameters and show no evidence of physical deterioration. 3.3.1 1.3 Salt fog;. The HRS components shall undergo the salt fog tests in 4.3.3.4. Electrical operation is required after the exposure period, and the HRS shall show no evidence of physical deterioration. 3.
44、3.1 1.4 Sunshine. The electroluminescent lamps shall maintain specified pdormance and show no post test eyidence of deformation, surface instability, splits, brittleness, or cracks in the lamp seal after the sunshine test of 4.3.3.5. Sunshine tests on complete assemblies are not required. 3.3.1 1.5
45、Furigius. Exposed and sheltered equipment shali operate and show no physical deterioration after testing in accordance with 4.3.3.6. 3.3.1 1.6 Wind. The HRS equipment shail not incur wind damage and shali operate as specified . HRS components shall operate as specied after being exposed to the icy c
46、onditions of 4.3.3.8. There shall be no physical damage to the equipment. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-85281C 99999Ob 20bb74b b58 MIL-PRF-8528 1 C(AS) 3.3.1 1.8 Dust (fine sand). The HRS shall continue to operate as speci
47、fied when exposed to the dusty environments of 4.3.3.9. 3.4 Electroluminescent lamp. 3.4.1 Electrical reauirements. The lamps shall operate from a supply of 60 Hz to 400 Hz with variable voltage up to 13 O vac. 3.4.2 Color. Each lamp shall emit green light with peak emissions at a wavelength of 540
48、nanometers f 3 percent when operated at an ambient temperature of 23 k 10 “C (73 f 18 OF) from a 120 vac, 400 Hz supply. There shall be no color variance in the light with changes in supply voltage. 3.4.3 Luminance. Lamp luminance, when operated at an ambient temperature of 23 f 10 “C (73 f 18 OF) d
49、irectly from a 120 vac, 400 Hz supply, and after a five hour luminance stabilization period, shall have an initial luminance of not less than 18 foot lamberts. After operating 1,000 hours, the lamp luminance shall be not less than eight foot lamberts. After operating 3,000 hours, the lamp luminance shall be not less than 4 foot lamberts. The luminance at any point of the luminous area shall be not greater than
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