1、5- 3 7- O? MIL-F-566 L2 m 7999906 0365670 6 R MIL-F-85668(AS) 28 February 1984 MILITARY SPECIFICATION FIRE SYSTEM, 20-MILLIMETRE POINT AND SUPPRESSIVE HELICOPTER, AH-IT (TOW), This specification is approved for use by the Naval Air Systems Command, Department of the Navy, and is available for use by
2、 all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 This specification establishes the requirements for performance, design, test, manufacture, and acceptance of the A/A49E-7(V4) AH-1T (TOW) Helicopter 20-Millimetre (mm) Point and Suppressive Fire System, hereinafter referred to
3、 as the system. 2. APPLICABLE DOCUMENTS 2.1 GoverGent document s. 2.1.1 Specifications, standards, and handbooks. Unless otherwise specified , the following specifications, standards, and handbooks of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (
4、DoDISS) specified in the solicitation form a part of this specification to the extent specified herein. - SPECIFICATIONS Mi li ta ry MIL-1-6 181 MIL-1-8500 Interference Control Requirements, Aircraft Equipment Interchangeability and Replaceability of Component Parts for Aircraft and Missiles Benefic
5、ial comments (recanmendations, additions, deletions) and any pertinent data which may be of use in improving this document shouid be addressed to: Commanding Officer, Naval Air Engineering Center, Engineering Specifications and Standards Department (ESSD), Code 93, Lakehurst, NJ 08733, by using the
6、self addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. -1 / THIS DOCUMENT CONTAINS 29 PAGES. , _ - _I. II Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-5bbB 12 7797706 0
7、365671 B H STANDARDS Military MIL-STD-130 MIL-STD-143 MIL-S TD-7 04 MIL-STD- 8 1 O MI L-F- 8 5 6 6 8 (AS) Identification Marking of US Military Property Standards and Specifications, Order of Precedence for the Selection of Aircraft Electric Power Characteristics Environmental Test Methods (Copies o
8、f specifications, standards, drawings and publications required by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer. ) 2.2 Other publications. The following document(s) form a part of this speci
9、fication to the extent specified herein. DRAWINGS General Electric Company 10 5D3853 116C3555 15 2D5402 15 2D5403 16 7C1557 167C2095 18 9F788 189F861 189F901 Adaptor, Recoil Mechanism Transducer, Pressure Interface, Slider Assembly Interface, Pressure Transducer Slider Assembly Coincidence Control U
10、nit Feed System, Ammunition Torque Box Assembly Gun Control Assembly Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DRAWINGS (continued) 197C7325 19 7C7326 201F525 201F798 2 01F7 99 209F115 2 18F3 26 2 18F3 27 2 18F3 28 2 18F3 29 2 18F330 2 18F331 7
11、9 83556 1- *- -i MIL-F-85668 12 797770b 0365b72 T O MIL-F-85668(AS) O Interface, Coincidence Control Interface, Torque Box Turret Contr o1 As sembly Turret Assembly, 20-mm Drive Assembly, Gun 20-mm Point and Suppressive Fire System Int e rf ace , Gun Drive As semb ly Interface, Turret Control Assemb
12、ly Interface, Turret Assembly, 20-m Gun Interface, Gun Control Assembly Interface, Recoil Adapter Interface, Ammunition Feed System Schematic Diagram, Electrical System Interconnections, AH-1T (TOW) (Copies of specifications, standards, handbooks, drawings, and publications required by uanufacturers
13、 in connection with specified acquisition functions should be obtained from the contracting activity or as directed by the contracting officer .) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification
14、 shall take precedence. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-85668 LE m 9997906 0365693 L R, MI L-F- 8 56 68 ( AS) Frequency Current (Amperes) (Hertz) 12 5 (s teady-stat e) 600 (peak) Vo It age 28 Vdc - 115 Vac 1 400 3. REQU IREMEN
15、T S 1 3.1 Item description. The system shall be an electrically-powered turret that includes an ammunition storage and handling subsystem. The system shall also include the necessary controis and interfacing electronics for turret operation. turret assembly and the gun shall provide a complete helic
16、opter armament system- The major components to be manufactured shall be as specified in 3.1.3. The system shall accommodate an M197 20-mm three-barrel gun. The 3.1.2 Interface definition. - 3.1.2.1 Electrical interface 3.1.2.1.1 Electrical power supply. The system shall operate from power sources wi
17、th characteristics conforming to MIL-STD-704, Category B. electrical power for all testing shall be as specified in Table I. The 3.1.2.1.2 - subsystem interconnection requirements is shown on Drawing 7983556. 3.1.2.2 Physical interface. The physical interface requirements shall be in accordance with
18、 the drawings specified in Table II. TABLE II. Physical interface requirements. Compone nt Turret Assembly Gun Control Assembly Gun Dr ive Assembly Turret Control Assembly Dr awing 218F328 2 18F329 218F326 218F327 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
19、 from IHS-,-,-.- MIL-F-85668 12 W 9779906 0365694 3 111! MI L-F- 8 5 6 6 8 (AS) Pressure Transducer Recoil Adapter Ammunition Feed System Slider Assembly Torque Box Assembly Coincidence Contro 1 Box I TABLE II. Physical interface requirements - Continued Component I Drawing I I 1 5 2D54 O 3 2 18F330
20、 2 18F33 1 15 2D5402 19 7C7326 19 7C7325 3.1.3 Major component list. 209F115, shall be as specified in Table III. The major components of the system, Drawing TABLE III. Major component list. I Ma ja r Component I Drawing I Turret Assembly Gun Control Assembly Gun Drive Assembly Turret Control Assemb
21、ly , Pressure Transducer , Recoil Adapter 201F798 18 9F90 1 201F799 201F525 116C3555 10 5D385 3 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Major Component Ammunition Feed System Slider Assembly Torque Box Assembly Coincidence Control Box Drawi
22、ng 18 9F788 167C1557 189F861 16762095 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-85668 12 I 7777706 0365696 7 I PO s i tion MIL-F-85668(AS) TABLE IV. Fire test positions. I Azimuth Elevation j (Degrees) (Degrees) i 0+2 - 0+2 - +lo7 - + 2 -
23、107 - + 2 -107 - + 2 0+2 - -49 + 1 - +10 + 1 - 0+2 - -49 + 1 - Note. Plus (+) values indicate a right azimuth or up elevation position. Minus (-) values indicate a left azimuth or down elevation position. 3.2.1.4 Clearing cycle. The gun shall be automatically cleared at the end of each firing burst.
24、 However, live rounds may be ejected during clearing if one of the following conditions occur: No live rounds shall be ejected during clearing. a. The bore line of the firing barrel differs from the commanded bore line position in either azimuth or elevation by more than 5.5 degrees b. There is a co
25、mmand to fire any fixed forward firing wing store c. The turret is commanded to the normal stow position. 3.2.1.5 Firing interruption. The firing.circuit shall be interrupted and the gun cleared in accordance with 3.2.1.4 when any of the following conditions occur: a. After any actuation command to
26、fire any fixed forward firing wing store, the actuation sequence shall interrupt firing and shall return the turret to the fixed forward firing position until the command is released. A time delay of 1.0 + 0.5 second shall be provided to assure safe projectile distance-before the turret can move out
27、 of the fixed forward firing position. b. The bore line of the firing barrel differs from the commanded boreline position in either azimuth or elevation by more than 5.5 degrees. c. The turret reaches the limit of its field of fire in elevation or azimut h. 7 Provided by IHSNot for ResaleNo reproduc
28、tion or networking permitted without license from IHS-,-,- MIL-F-85bb 12 - 797970b 0365697 7 I MI L-F - 8 56 6 8( AS) 3.2.1.6 Turret angular coverage. Turret angular coverage shall be limited by both mechanical and electrical stops. The mechanical limit shall be defined as the first point of contact
29、 with the stop mechanism. shall be the point at which turret drive power is turned off and the gun is cleared. The electrical limit 3.2.1.6.1 Azimuth. The mechanical stops shall allow the turret to traverse 110 +1, -0 degrees in azimuth to the left and right of the straight forward position. The ele
30、ctrical stops shall allow the turret to traverse 109.50 + 0.25 degrees to the left and right of the straight forward position. 3.2.1.6.2 Elevation. The gun elevation limits shall be in accordance with Table V. TABLE V. Turret elevation limits. Azimuth (Degrees) O through 5 10 20 30 40 45.8 Straight
31、Line to 110 Elevation (Degrees) Mechanical 15.25 16.43 18 a50 19.40 21 .o0 21 .o0 12.21 Electrical i/ 14.75 15.93 18 -00 18.90 20.50 20.50 11.71 17.25 18.43 20.50 21.40 23 .O0 23 .O0 14.21 - i/ Electrical limit tolerance shall be H.50 degrees and shall activate prior to contacting the mechanical lim
32、it. - 2/ The dynamic limit shall be defined as the maximum turret saddle position that results from the following conditions. With the electrical limit disabled, the dynamic limit is reached when a fully equipped M197 gun or equivalent mass is installed in the turret and elevated at the full elevati
33、on slew velocity into the mechanical stop. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-85668 22 9999906 0365698 O = 3.2.1.6.3 Depression. The mechanical depression limit shall be -50 +1 degrees from a plane parallel to the turret mounting
34、 surface. The electrical depression limit- shall- be -50.25 + 0.25 degrees -from a plane parallel to the turret mounting surf ace. 3.2.1.7 Turret velocitv. 3.2.1.7.1 Angular velocity. Turret angular velocity (steady-state) shall not be less than 80 degrees per second in azimuth and not less than 60
35、degrees per second in elevation. (-109 degrees) to the maximum right azimuth position (+lo9 degrees) in not more than 3.5 seconds and from the maximum right azimuth position (+LO9 degrees) to the maximum left azimuth position (-109 degrees) in not more than 3.5 seconds. The turret shall slew from th
36、e maximum elevation position to the depression angle of 50 degrees in not more than 1.5 seconds and from 50 degrees depression to the maximum elevation position in not more than 1.5 seconds. The turret shall slew from the maximum left azimuth 3.2.1.7.2 Elevation velocity error. With the elevation co
37、mmand signal changing at a constant rate corresponding to a turret movement of five degrees per second in elevation, the turret shall follow this motion within three mils as measured by the synchro error signal received by the servo amplifiers. 3.2.1.7.3 Azimuth velocity error. With the azimuth comm
38、and signal changing at a constant rate corresponding to a turret movement of five degrees per second in azimuth, the turret shall follow this motion within two mils as measured by the synchro error signal received by the servo amplifiers. O 3.2.1.8 Turret acceleration. The turret drives shall accele
39、rate the turret at a minimum rate of 120 degrees per second squared in any axis or cambination of axes. standstill. The acceleration shall be measured using a step input from 3.2.1.9 Fixed turret positions. 3.2.1.9.1 Fixed forward firing. The turret shall assume the fixed forward firing position whe
40、n a gunner or pilot command signal is received. 3.2.1.9.2 Upper stow. When the aircraft action switch is not depressed, The the turret shall maintain an upper stow position with the gun at O + 1 degree azimuth and elevated 11 + 1 degrees relative to the helicopter waterline. turret shall assume and
41、retain the upper stow position whenever the action signal is removed and there is no fixed forward firing command. 3.2.1.9.3 Emergency stow. If system electrical power is lost, the emer- gency power system shall return the turret to O + 5 degrees in azimuth and a minimum of 10 degrees in elevation r
42、elative to the aircraft datum line. the emergency stow position, the system shall provide a signal for a panel indication. When in 3.2.1.10 Helicopter wing stores safety interlock. The wing stores safety interlock shall prevent the firing of wing stores except when the turret gun line is within five
43、 degrees of the zero degree azimuth position. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-5668 12 9999906 0365699 2 E MIL-F-85668(AS) 3.2.1.11 Ammunition remaining signal. The ammunition remaining signal shall permit a count of the ammuniti
44、on remaining in the storage and handling subsystem. round has passed the counting device, after which theaccuracy requirement shall not apply, The counting accuracy tolerance shall be i- 10 rounds until the last 3.2.1.12 Ammunition totalizer. The ammunition totalizer shall indi.cate the total number
45、 of rounds that have been cycled through the system. The totalizer shall perform independently of the gun and shall count all rounds cycled including dummy and misfired rounds. 3.2.2 Physical characteristics. 3.2.2.1 Weight. The weight of the system shall be not greater than 350 pounds. 3.2.2.2 Ammu
46、nition storage capacity. The system, including the feed chute, shall have an ammunition storage capacity of 750 -10 rounds. 3.2.3 Reliability. The mature system shall have a reliability of 7500 mean rounds between failure (MRBF). See 6.3.3.1 and 6.3.3.2. 3.2.4 Maintainability. 3.2.4.1 Access. The de
47、sign shall permit simple and rapid access to the major components without their removal from the system. 3.2.4.2 Gun replacement. The turret design shall allow the Ei197 gun to be replaced by two persons in a maximum of 10 minutes. The required support equipment shall be available during gun replace
48、ment. 3.2.4.3 Turnaround time. A maximum of 15 minutes shall be required to fully reload and arm the system. Where possible, the system design shall allow personnel under combat conditions to fully reload and am the system without the use of any tool. Quick disconnect fasteners and hand-operated lat
49、ches shall be used on access panels. Latches, pins, and any other type of fastener shall be operable by personnel wearing cold weather clothing. If the use of a screw- driver is required, the type of screw heads used shall be standardized. 3.2.4.4 Special tools. The system and its components shall be designed for assembly, disassembly, and installation using standard
