1、MIL-H-8890 Lb 7797906 0188439 O T MILH-8890(ASG) I NOVEMBER 1961 MILITARY SECIFICATION IwpBULIC COMPONENTS, TYIE III, (-65O to +450 F), GENEELAL SPECIFICATION FOR This speoification has been approved by the Department of the Air Foroe and by the Bureau of Naval Weapons. 1. SCOPE 1.1 This peoificatio
2、n covers general re uirements common to hydraulio components used in type III hydraulic systems Specification MIL-H-8891, to +450 F) conforming to For types I and II comporisnts, see Specification MIL-H-8L-C-5541 MIL-1-6866 MIL-1-6868 MIL-P-O MIL-S-7742 MIL-M-7969 Ma-H-844.6 MIL-F-8815 MIEH-8891 MIL
3、-T-9107 MIL-F-25682 MIL-D-70327 Solenoid, Eleotrioal, Gensral Specification for Environmental Testing, Aeronautioal and Aseooiated Chemioal Films for Aluminum and Aluminum Alloge Inspeotion, Ranstrant Method of inspection Proaesa, Maptic Partials Plates, Information and Identifioation Sorew Threads,
4、 Standard, Optimum Seleoted Serbs8 General Speoification far Motors, Alternating Current, O-Cyale, ll5/200 Volt System, Airoraft, Claas A end Class B, General Speoifioation for Hydraulio Fluid, Nonpetroleum Base, horaft Filter ad Filter Elements, Fluid Fressure, Hydraulio Line, i5 Micron Absolute, T
5、ype II Systems Hydraulic Systeme, ManiLed Flight Vehicles, Type III, Design, Installation, and Data Requirements for Test Reports, Preparation of Filter and Filter Element, Fluid Pressure, Hydraulio, Absolute, 25 Micron, - specification, which shall govern. Where the requirements for a 3.3 la or as
6、specified in the detail speci- fication within the fluid and anbie93 temperature range of -65 F to t45Oo F after being fatigued and temperature aged for a period equivalent to that experienced during the life of the component. 3.4.5 Surze pressures.- Components shall be designed so as to not ixuce s
7、urge presswes in excess of 135 perceit of the maximum operating pressure speci- fied in the deteil specification, wheti tested in a system and under test condi- tions as specified in the detail specification, 3. however, drive screws may be used for attaching nameplates. 3.4.12 Directionallv critica
8、l comDonents.- Components which are subject to Line-mounted units shall also be marked nialfur-ctfon or failure owing to reverse installation shall make provision to reider improper installation impossible with an arrow indicating direction of flow. shall be so desig-xed that size or location of por
9、ts or mounting provisions are unsymmetrfcal. Components which mount to structure 3.4.13 Structurai strew- in any case, index markes shall be incorporated to indicate the proper position, The design shall be such that special or unusual 3.13.1 Storage life.- The component shall be designed for B stor
10、age life Periodic inspection and exer- compatible with the specific weapon system requirements and shall perform satis- factorily at any the during the storage period. cising of the component, if required, shall be specified and accompanied by sub- stantiating data. 3.14 Sumlemental reauirements and
11、 information. - 3.l4.1 Froposal requirements.- The contractor shall submit the following with the proposal: (a) Drawings: A prelhainary design data drawing prepared as (b) Electrical power (if applicable) : A tabulation of electrical specified in this specification. power requirements shall be provi
12、ded and shall include the important electrical characteristics at the extreme environ- mental condit ions, 8 o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(c) Development programs An outline of the proposed development (d) Quality assurance progr
13、am: An outline of the proposed prepro- (e) testing of any mproven mechanisms, materials, and processes. duction and production testing. Ground eppor$x A list of any recommended publications, spares, equipment, training, and technical service for maintenance, overhaul and testing. 3.l4.2 u.- The cont
14、ractor shall submit the followbg data, Date5 of submittal will be determined in subsequent negotiations. (a) Progress reports8 Periodic reports showing the progress (b) Final versions: Finalized versions of the data under (c) Preproduction and production test reports: Formal reports (d) Engineering
15、drawingss Drawings prepared as specified in of the development program. proposal requirements. on preproduction ani: production tests. Specification MIL-D-70327. 3.14.3 Sumort.- The general areas of expected-contractor support are listed below., Requirements will be deterniined in subsequent negotia
16、tions. (a) Publications I All publications necessary for support of (b) Spares a Recommended storage period, overhaul, and spare (c) Training: Any special training required of service persomel. (d) Technical service t Technical persome1 required to support (e) Failure data: Record of failures in tes
17、t end service. the component. parts provisioning. the component. 3014.4 Ls it is the discretion of Che air vehicle contractor, This approval of similar devices is nut automatic upon approval 4-5 Test failures.- If a test specimen or any of its parts fails to conform to this specification, the contra
18、ctor shall advise the air vehicle contractor within 2i+ hours of the failure and of the planned corrective action. Individual tests may be continued, pending investigation of the failure. Final acceptance of components on hand or produced later will not be made until the cause of failure has been as
19、certained, the correction incorporated, and it is determined by further testing that the corrected component conforms to this specification. investigation of a test failure indicates that defects exist in components already Where the 11 Provided by IHSNot for ResaleNo reproduction or networking perm
20、itted without license from IHS-,-,-MIL-H-8890 Lb 7997906 0188450 T W I MIL-H-8890 (AS) accepted, the contractor shall advise the air vehicle contractor of these defects and shall be responsible for ascertaining and making the corrections to all prts whether delivered or in production. major failures
21、 and resulting corrective action with the proouring activity. The air vehicle contractor shall coordinate 4.6 Test conditions.- 4.6e Test fluid.- The test fluid shall be ML0-8200 Mess otherwise specified in the detail specification. 4.,6.2 Fluid temDerature.- The fluid temperature shall be as specif
22、ied for Unless otherwise specified, the tolerance shall be *5O F, each individual test. If the fluid temperature is not specified, the temperature shall be 95O A15O F. For components with appreciable heat- enerating characteristics, such as relief shall be as specified, and the inlet fluid temperatu
23、re may be decreased a maximum of 25O F to compensate for this heat generation. The fluid temperature shall be measured as near as practicable to the component ports. periods, the component shall be bled of air and inert gas and maintained full of fluid e i l valves, and solenoid-operated valves 9 ex
24、cept pumps) , the outlet fluid temperature During all soaking 4.6.3 -4.- Unless otherwise specified in the detail specification, the test fluid shall be continuously filtered through a .f ilter which conforms to Specification MIL-F-8815 or MIL-F-25682. satisfactory for the temperature range encounte
25、red, and cleaned or changed regu- larly to avoid clogging. shall be specified in the detail specification. The filter and element used shall be The degree of contamination by weight of fluid used 4.,6.4 Environmental conditions. - Unless otherwise specified in the detail specification, the ambient t
26、emperature tolerance shall be t15O F. If environgen- tal conditions are not specified or if llroom conditionsI1 are specified, the ambient temperature shall be 77O algo F, the barometric pressure shall be 28 A4 inches of mercury, and the relative humidity shall not exceed 90 percent. 4.6.5 Test eaui
27、ment.- Tests shall be conducted with a powsr-driven pump or a fluid power source. The test setup shall be such as to prevent air.or moiste from coming in contact with the hydraulic fluid. The instruments used in measur- ing pressure, temperature, torque, and, speeds shall be calibrated prior to star
28、t- ing the tests and shall be recalibrated throughout the tests a8 necessary. 4.6.6 Stead.v-state tests.- Steady-state tests are defined at3 tests conduc- Each test Ss usually conducted aa an ted under selected steady-state conditions. individual test, but in some cases may be combined, subject to t
29、he selected con- stant conditions. component will be subjected, but will be representative of those conditiona and are intended to provide proof that the component will operate satisfactorily in service under these conditions. These tests do not include all the conditions to which the 12 - Provided
30、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L _ - - I_-I_- - - - . -. I _- - I- - .- I - -_I - _. - - I -I_- - MIL-H-90 Lb M 9999906 OL451 L M 4.7 Test methods.- lication ARP 24 and shall be performed at the flaw specified in the detail specification, The
31、 pressUre drop shall COnfOrm to requirements Speci- fied in the detail SpeCificatiOn. the component shall be tested for dielectric strength. to Method 301 of Standard MIL-ST3-202, excest that the temperatme shall be not less thzn 453O F or as specuied in the detail specification. 4.7.7 -e- When spec
32、ified in the detail specificatiox, The test shall conform .!,.,7.8 Elsctriczl Dower characteristics.- The rleotrical power characteris- tics shall be established and test conditions shall be outlined in the detail spe cif ica t ion. 4-7.9 Cluteh or brake s1imaae.- When specified in the detail spcifi
33、ca- tion, the component shall be tested for slippage of the clutch or brake d-an eleotrically operated component. tion MIL-M-7969, The test procedure shall conform to Specifica- 4.7.10 Surne pressure.- When specified in the detail specification, the compone_.lt shall be tested for pressure surges. T
34、he component shall be tested in E. test- seixp simulating an actual application acceptable to the air vehicle eon- tractor. specified in the detail specification. a hydraizloscope (or equivalent) shall not exceed 135 percent of the maximum speci- fied operating pressure. Ch camponent shall be operat
35、ed several times, using the rated flow The induced pressure surges as shown on A07.11 Low temeratme-.- When specified in the detail specification, the component shall De tested for operation at lotr temperature. be connectsd to 2 static head of 1 to 3 feet of the test fluid, and the ambient and flui
36、d temperature shall be lowered to -65O F, After the component tempera- ture has stabilized at -65O F, the component shall be functionally operated at least 10 times while continuing to maintain ambient and inlet-fluid temperatures of -65O F. owing to operation fs permitted. The above prooedure shall
37、 be repeated with the temperature stabilized at -2OO F. shall pass the tests specified in 4.7.2 while maintaining the ambient and inlet- fluid temperature at -2OO F. 4.7.12 Irature.- When speoified in the detail specifioa- tion, the componenet shall te tested for operation with increasing temperatur
38、es. The component shall te stabilized at an ambient and fluid temperature of -65O F. The temperature shall then be increased to the maximum fluid and ambient tempera- tures specified in not less than 1/2 hour and not more than 2 hours. The component shall The component shall operate. An increase in
39、outlet-fluid temperature The oomponent shall then be subject to and While . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-8890 (AS) the temperatures are being raised, the component shall be subjected to and shall pass the tests specified for
40、operation test at approximately 5 equal increments of temperature increase, temperature of the entire component to stabilize. component shall he tested for operation while being subjected to a sudden applica- tion of high-temperature fluid. shall be as specified in the detail specification. These te
41、sts shall be made without witing for the 4.7.13 Temperature shock.- When specified in the detail specification, the “he test setup and test conditions to be used 407e14 High temperature.- When specified in the detail specification, the component shall be tested for operation at high temperatures. Wi
42、th the component stabilized shall be subjected to and shall pass the tests specified in 4,7.2 while maintab- ing the ambient and fluid temperatures, at the maximum fluid and ambient temperatures specified, the component . 4*7.15 Endurance.- When specified in the detail specification, the compo- nent
43、 shall be tested for operational endurance under steady-state conditions. The compo,.ient shall be subjected to the operating cycle, the number of operating cycles, schedule of cycles, cyclic rate, stroke, rate of flow, loads, altitudes, hipulse peaks, leakage, and temp and the fact that the Governm
44、ent may have formulated, furnished, or in any way supplied the said drawings, speoifications, or other data is not to be regarded by implioation or otherwise as in any manner licensing the holder or any other person or oorporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. Custodians : Navy - Wep Air Form - AFSC Preparing aativityr Navy - Wep Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
