1、 b 2113423 T4 = INCH-POUND 1 12 November 1999 MIL-PRF-3205 1 PERFORMANCE SPECIFICATION TESTER, PRESSURIZED CABIN LEAKAGE, LARGE AiRCRAFT. TRAILER MOUNTED This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1,l U. This trailer mounted large ai
2、rcraft pressurized cabin leakage tester specification covers only one type of tester designated as AFM32T-4. This tester is a self contained, enclosed, four wheel, pneumatic tire, towable, trailer mounted, diesel engine powerplant, cabin leakage tester capable of 10 - 1000 cubic feet per minute (ch)
3、 at 2 - 12.5 pounds per square inch gage (psig). 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed 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 info
4、rmation or as examples. While eveq effort has been made to ensure the completeness of this list, document users are cautioned that they must meet ali specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 2.2.1 document to the extent spe
5、cified herein. Unless otherwise specified, the 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). . The following specifications and standards form a part of
6、this i Beneficial comments (recommendations, additions, detetions) and any pertinent data which may be of use in improving this document should be addressed to: SA-ALC/TILDD, Kelly AFB TX 78241- 5916 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of th
7、is document or by letter. AMSC NIA FSC 4920 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- = 9999906 2113424 920 E MIL-PRF-3205 1 SPECIFICATIONS DEPARTMENT OF DEFENSE MS24397 - Reducer, Boss, Precision Type MS28049 - Indicator, Vertical Speed, 3 In
8、ch MS3 3 660 - Tubing End, Hose Connections, Standard Dimension for STANDARDS FEDERAL FED-STD-595 - Colors used in Government Procurement MILITARY MIL-STD-209 - Lifting and Tie-down Provisions MIL-STD-46 1 - Requirements for the Control of Electromagnetic MIL-STD-1366 - Transportability Criteria AIR
9、 FORCE - NAVY AERONAUTICAL AFI 32-7086 - Hazardous Material Management AN832 - Union, Flared Tube, 3/8 Bulkhead and Universal. AN893 - Bushing-Screw Thread Reducer AN924 - Nut, Tube, Bulkhead and Universal Fitting. AN929 - Cap Assembly, Tube, Pressure Seal. AN6270 - Hose Assembly - Detachable Swivel
10、 Fitting, Low Pressure. (Unless otherwise indicated, copies of the above specifications and standards are available from the Standardization document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 1 1 - 5094). 2.3 -Gov- . The following document form a part of this specification to
11、 the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the same issues of the documents cited in the so
12、licitation (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI-3.Io. 1-85 - Gauges - Pressure Indicating Dial Type - Elastic Element OD adopted) (Application for copies should be addressed to the American National Standard Institute (ANSI), 11 W. 42ND Street, 13“ Floor, New York, NY 10036)
13、2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 999990b 2113425 8b7 MIL-PRF-3205 1 2.4 standard 3.5.1 safety devim . Shields and caution notes shall be furnished where necessary and maximum use shall be made of applicable safety devices. 3 Provide
14、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-3205 I 3.5.1.1 m. A red lme zone shall be marked on the air temperature gauge face beginning at 120F. 3.5.1.2 Relief de vice. A relief device shall be incorporated to prevent over pressurization of air
15、craft under test. 3.5.2 repairs, and overhaul can be easily accomplished by personnel without the use of special tools. All components shall be selected and located for ease of operation, servicing, inspections, and maintenance shall be able to service and visually inspect without removing panels or
16、 components. * . The tester shall be constructed so that lubrication, adjustments, . 3.5.3 O psi. A multi-stage turbine type meter with LED shall be provided with accuracy to 2 percent minimum of scale. Protective covering shall be provided over the flowmeter to protect the operator from injury in c
17、ase the flowmeter should break or explode. 3.10.2 correwon curve . A permanent data plate that is legible and waterproof, identifying the pressure-temperature correction curve, shall be provided and mounted on the panel adjacent to the flowmeter for correcting observed airflow readings to ambient co
18、nditions. Pressure lines shall be shown and marked to correspond with pressure lines on the flowmeter. 3.10.3 Conve rsion chart . A permanent data plate that is a legible and waterproof, identifjing conversion chart, shall be provided and located on the panel for converting the airflow from cubic fe
19、et per minute to pounds per mmute. 3.10.4 Pressure . A rate of climb indicator per MS28049 shall be furnished to indicate pressure equalization of the tester output and the enclosure being pressurized. The dial face shall indicate decreasing and increasing pressurization instead of up and down. The
20、indicator shall be redlined beyond the 5,000-foot mark, both increasing and decreasing. Some means shall be provided to 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-= 999990b 2113429 402 MIL-PRF-3205 1 prevent damage to the instrument should the
21、 rate of increasing or decreasing pressure exceed the redlined values. A permanent caution plate containing the following information shall be securely attached to the panel immediately below the indicator. CAUTION - DO NOT INCREASE OR DECREASE CABW PRESSURIZATION AT THE RED-LJNED RATES 3.10.5 Cabin
22、 pressure gage , The corrosion-resistant gage shall be accurate to within 1 percent or less of full scale and shall conform to ANSI B40.1 except as specified herein. The gage shall provide a range of from O to 15 psi and shall incorporate a means to restore the accuracy of the gage under all service
23、 conditions. The gage shall be suitable for operation from -25F to 160F. The gage shall be of the recess type provided with a mounting flange at the fiont of the gage. The mounting flange and dial shall not extend more than 0.625 inch beyond the external surface of the panel. The pointer shall be ad
24、justable without removing the gage from the panel. 3.10.6 -re indicator . A remote-reading, dial-type temperature indicator having a scale range of from -25OF to approximately 2W0F and accurate within k 2F throughout the range shall be furnished. The temperature indicator shall measure the temperatu
25、re of the pressurized air on the discharge side of the flowmeter and shall be marked by a red line above 12OOF. A permanent caution plate containing the following information shall be securely attached to the panel immediately below the indicator. CAUTION - AIR TO CABIN SHOULD NOT EXCEED 120F. 3,10.
26、7 Pressureeaees. The corrosion-resistant gages specified herein shall be included on the panel, Each pressure gage shall incorporate a safety blowout device that shall relieve the gage case pressure due LU gage Pdilurc. The dial arid puiriicr shall be sepiarciic num Lhc gidge movemcnc zu prevent rup
27、mre through the fiont of the gage in the event of gage failure. The pointer shall be adjustable without removing the gage from the panel. All gages shall be anti-vibration mounted. 3.10.7.1 commercial equivalent hose and be of sufficient length to permit removal and installation from the front of th
28、e panel. . Pressure gages shall be connected with flexible AN or MS type hose, or 3.10.7.2 Gaee test fithng . The following three items when assembled compose the fitting to be installed on the control panel: AN832-4D nipple, AN924-4D nut, and AN9294 cap. 3.10.7.3 control panel adjacent to the appro
29、priate gages, and the panel shall be marked to indicate that the fittings are gage test connections. The outlets from the tester include: . For interoperability the following three fittings shall be mounted on the a. Cab in Pressu re. Fitting AN832-8D with AN 929-8 cap assembly b. mv Pressu re. Fitt
30、ing AN832-6D with AN 929-6 cap assembly c. . Fitting AN832-8D with AN929-8 cap assembly 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MlL-PRF-3205 1 d. failure of any item or assembly due to deterioration from exposures in this test; or formati
31、on of any undesirable condition that cannot be remedied by routine maintenance procedures shall be cause for rejection. . With hoses installed, the operation of the tester shall be checked at 1000,500, . The tester shall be subjected to the following tests. UPOR completion of each 4.4.4.1 -e rature.
32、 The tester shall be subjected to low temperature in accordance with the following procedure. The diesel engine testing requirements are specified in Appendix A, A.3 .O. All gages, valves, meters, accessories, louvers and regulators shall be operated and shall perform satisfactorily in the -25F ambi
33、ent temperature condition. II Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-= 0b 2333434 87T D MIL-PRF-3205 1 4.4.4.2 following procedure. Upon completion of the 50 hour exposure, the ambient temperature shall be lowered to 120F and the tests speci
34、fied in 4.4.2 conducted. Failure of the aftercooler system to limit the temperature of the pressurized air leaving the test specimen to a maximum of 14S0F while the test specimen is operating at full capacity of 1000 cfm standard air and 12.5 psi in the 120F ambient shall be cause for rejection. . T
35、he tester shall be subjected to high temperature in accordance with the 4.4.4.3 BIlin test. The tester shall be subjected to rain (rain is rated at 4 inches of water per hour) in accordance with the following procedure. The tester shall be positioned on the test chamber floor in its normal operating
36、 position. After exposure to rain for 24 hours, the test specimen shall be started and operated at 1000 cfm and 12.5 psig for a penod of 30 minutes. Failure of the test specimen to start or operate satisfactorily during the rain test shall be cause for rejection. 4.4.5 m. The tester shall be connect
37、ed through the 40 fi long, 4 inch ID, collapsible air hose specified in Par. 3.13 f to a throttling device to create the required pressure and flow conditions (pressures and flows shall be measured at the hose outlet) and the following endurance tests accomplished. Readings shall be recorded every h
38、our for all gages, meters, and instniments of the test specimen and output flow, pressure. Barometric pressure and ambient temperatures shall be recorded. If 24 hour manning is not possible, the test periods may be fragmented, however, the data must be recorded for each test time period of operation
39、 to achieve the total number of hours in each case below: a. Conduct the calibration tests specified in 4.4.3. b. One hundred and ninety two hours of operation at 1000 ch and 12.5 psi. c. FOS two hours of operation at 500 cfm and 8 psi. d. Forty two hours of operation at 200 cfm and 2 psi. e. Forty
40、two hours of operation at 200 ch and 3.5 psi. f. Forty two hours of opention at 100 ch and 8 psi. g. Forty two hours of operation at 1 O cfn and 2 psi. h. Conduct the calibration tests specified in 4.4.3, NOTE: Comparison of this data in item h. with data recorded under item a. shall indicate whethe
41、r a failure or undue wear has resulted from the endurance test. 4.4.6 Air c- . The canopy seal air compressor shall be operated at least 25 percent of the time during all endurance tests as specified in 4.4.5. The performance of the compressor shail be checked periodically during each test. Failure
42、of the drive coupling or any marked decrease in performance or failure of a component part of the pressurizing system shall be causc for rejection. 4.4.7 suppression. This test shall be conducted in accordance with MIL-STD-461 for radiated interference, except when a shielded room is not readily ava
43、ilable a test location shall be selected in place of a . The test specimen shall be tested as a complete unit for radio interference 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-b 2113435 706 = MIL-PE-3205 1 shielded room. This shall be where t
44、he inherent background level and the area background level are within the acceptable limits specified in MIL-STD-461. The Testing Meter and test specimen shall have a common ground potential in substitution for the ground plane, and the meter antenna shall be a maximum of 20 feet from the perimeter
45、of the test specimen. 4.4.8 Noise level. The tester noise level shall be measured at a maximum of 1 O feet from the perimeter, and shall not exceed the values specified in 3.5.4. Measurements shall be taken out-of-doors on a paved surface in at least 12 different operator positions, 30 apart in a ho
46、rizontal plan, parallel to the trailer bed. During this test, the test specimen shall be operated at full rated load with a 200 standard cubic feet per minute (SCFM) by-pass. . - The tester shall be placed on a platform with the parking brake(s) set 4.4.9 to prevent it fiom rolling. The platform sup
47、porting the tester shall be tilted in eight different directions, 45 apart, on an 8.5 incline with the true horizontal plane. The test specimen shall be started and operated at 1000 cfin and 12.5 psi for 15 minutes in each position. The test specimen shall perform satisfactorily (4.4.2) or failure o
48、f a component (shutdown of the diesel engine) shall be a cause of rejection . . 4.4.10 Serviceab b. The test specimen shall be inspected and evaluated fiom the standpoint of ease of maintenance, servicing, operation and safety while maintenance personnel wearing heavy gloves or foul weather clothing
49、. Particular note shall be made with regard to provisions made to prevent accumulation of snow, ice, or any element that may hinder servicing and operation. 4.4.11 Mob (202) 233-9256. The EPA does not maintain a list of engines meeting this requirement; individual suppliers maintain their own lists. A.3.9.2.2 Engine selehm . The engine selection process must take into consideration the changing em
