1、12 May 1980 SUPERSEDING 2 July 1976 Class B made by subjecting the inflator assemblies to the pressures specified The test shall be 21 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85352 47 m 7797706 0257793 7 m MIL-1-8 53 5 2 herein to produ
2、ce these readings, first with the pressure increasing, then with the pressure decreasing. With the pressures increasing, the pressure shall be brought to, but shall not exceed, the pressure specified to give the desired reading; and with the pressure decreasing, the pressure shall be brought down to
3、, but shall not fall below, the pressure specified to give the desired reading. Accuracy of Size 1 gages at each reading shall be within +6 psig. reading shall be within T2 psig from 10 to 80 psig and +4 psi from 81 to 150 psig. The inflator assembly test shall be conducted on a test set- up as show
4、n on Figure 8. The receiver test gage, shown in this test Set-up, shall conform to the specifications of ANSI B40.1-1974 for test gages. It shall have a pressure range of not more than 750 psi, and shall be graduated in increments not larger than 2 psig. Accuracy of Size 2 gages at each 4.6.3 Overpr
5、essure. With the relief valve removed and its attachment point plugged to prevent leakage, the inflator assembly with lever depressed shall be subjected to a pressure of 3000 psig. lever shall be released and the inflator assembly shall be subjected to the above test pressure for a period of 10 minu
6、tes. and remote controller assembly shall show no sign of leakage or rupture. Not less than 5 minutes following the application of the specified pressure, the inflator assembly shall be subjected to the test of 4.6.2. No calibration or repair of the gaging elements shall be permitted. If the accurac
7、y exceeds the tolerance specified, the gaging elements shall be rejected. The The gage element This test shall be performed with both size gage elements. 4.6.4 Endurance. The inflator assembly and dual chuck stem gage shall be subjected to 10,000 applications of pressure from O to 80 + 5 percent of
8、full-scale pressure and return to O at the rate of 10 + 5cpm. The applied pressure with respect to time shall approximate a sine wave shape. inflator assembly and dual chuck stem gage element shall be subjected to the test of 4.6.2. No recalibration or repair of the gaging elements shall be permitte
9、d. If the accuracy exceeds the tolerance specified, the gaging elements shall be rejected. Not more than 5 minutes following this test, the 4.6.4.1 Functional test. The inflator assembly functional test shall be conducted on the test Set-up shown in Figure 8. Pneumatic pressure to the remote-control
10、ler shall be regulated to 1500 psi. The inflator valve shall be slowly depressed to allow gas to flow into the receiver. There shall be absolutely no indication of pressure on the gage element as the inflator valve lever is depressed. indicator must remain absolutely stationary while gas is flowing
11、into the receiver. lever shall be slowly released. The valve shall instantly stop the flow of gas to the receiver. The gage element indicator shall indicate the pressure in the receiver to within - +6 psi for the Size 1 gage The gage element At the end of a 5 second interval, the inflator valve 22 P
12、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-W 3 % a (3 I W rn O 2 x ow 0-I w oz 3 rn u) W u: Q Co aJ k 3 23 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M*IL-I-5352 47 W 777770b 0257773 2 W MIL-
13、1-85352 element, and +2 psig from 10 to 80 psig and +4 psig from 81 to 150 psig for the Size 7 gage element without overshoot. shall be slowly depressed and released a total of 4 times to bring the receiver pressure up to the gage element capacity. source pressure being introduced at the gage elemen
14、t or delay in the valve instantly shutting off the flow of the source gas shall be cause for rejection. The inflator valve lever Any evidence of the 4.6.4.2 Relief valve test. The relief valve test shall be conducted on the test Set-up shown in Figure 8 with source pressure regulated to 1500 psi. 10
15、0 psi. until the relief valve opens, inflation. setting by more than 5%. reduce receiver pressure to 85% of relief valve setting. valve shall reseat and exhibit zero leakage. repeated or a total of four times for this and for relief valve settings of 200, 350, 500 and 650 psi. The relief valve shall
16、 be adjusted to vent at The relief valve shall prevent over- The test gage reading shall not exceed the relief valve The bleed-off petcock shall be opened to The inflator lever shall be depressed to pressurize the receiver The relief The above tests shall be 4.6.5 Drop test. The inflator assembly an
17、d dual chuck stem gage shall be dropped at least 25 times from a height of not less than 4 feet on a concrete floor, The inflator assembly and dual chuck stem gage shall strike the floor in various attitudes, i.e. the valve pressure gage, chuck etc. shall hit the floor rather than the hose. The lens
18、 of the pressure gage shall not be chipped or cracked and the gage performance shall not be impaired. shall be subjected to the test specified in 4.6.2. repair of the gage elements shall be permitted. the tolerance specified, the gage element shall be rejected. After the drop test, the gage elements
19、 No recalibration or If the accuracy exceeds 4.6.6 Cold test. Gage elements shall be subjected to a Not cold temperature environment of -2OOF for not less than 6 hours. more than 3 minutes after removal from the cold temperature environment, the gage elements shall be subjected to the test specified
20、 in 4.6.2. No recalibration or repair of the gage elements shall be permitted. If the accuracy exceeds the tolerance specified, the gage elements shall be rejected. - 4.6.7 Heat test, Gag$ elements shall be subjected to a Not heat temperature environment of 140 F for not less than 6 hours. more than
21、 3 minutes after removal from the hot temperature environment the gage elements shall be subjected to the test specified in 4.6.2. recalibration or repair of the gaging elements shall be permitted. If rej ected. No . the accuracy exceeds the tolerance specified, the gage elements shall be 24 Provide
22、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.6.8 Friction test, Gage elements shall be tested for inherent friction on the test Set-up as shown in Figure 8. shall be tested at no less than four points over the scale range. Size 1, the pressure in the r
23、eceiver shall be brought up to approximately 110 psi by depressing the inflator valve on the remote-controller. lever shall be released and the bleed-off petcock shall be opened to allow pressure in the receiver to bleed down at not less than 10 nor more than 20 psi per minute. The bleed-off petcock
24、 shall be shut off as soon as the movement of the indicator in the gage element is noted. The difference in the pressures indicated by the gage element indicator and the test gage shall notexceed 30 psi. approximately 300 psi, 450 psi and 600 psi. For Size 2, the pressure in the receiver shall be br
25、ought up to approximately 28 psi by depressing the inflator valve on the remote-controller. The lever shall be released and the bleed-off petcock shall be opened to allow pressure in the receiver to bleed down at not less than 10 or more than 20 psi per minute. The bleed-off petcock shall be shut of
26、f as soon as the movement of the indicator in the gage element is noted. The difference in the pressures indicated by the gage element indicator and the test gage shqll not exceed 10 psi. The test shall be repeated at approximately 75 psi, 112 psi, and 150 psi. A total of 10 tests shall be conducted
27、, each test consisting of an examfnation at four points. Any evidence of failure to indicate pressure wfth the accuracy requirements stated above shall be cause for rejection. The gage For The The test shall be repeated at 4.6.9 Calibration test. The calibration test shall be conducted on the test s
28、etup shown on Figure 8. The pressure in the receiver shall be brought up to half the gage element range. For Size 1, the adjustment mechanism of the gage element shall be adjusted to indfcate 20 psi aboye the reaing on the receiver gage, and then readjusted to indicate 50 psi below the reading on th
29、e receiver gage. Por Size 2, the adjustment mechanism of the gage element shall be adjusted to indicate 10 psi above the reading on the receiver gage, and then readjusted to indicate 10 psi below the reading on the receiver gage. mechanism or Size 1 and Size 2 gages shall then be adjusted until the
30、indicator matches the reading on the receiver gage. mechanism shall be locked and the gage subjected to the accuracy test of 4.6.2. Three additional adjustments are permitted to calibrate the gage to meet the accuracy requirements of 4.6.2. The adjustment The adjustment 4.6.10 Valve adapter test. It
31、 shall be demonstrated that the tire valve adapter can be applied to a standard tire valve stem and valve stem extension without use of special tools. After installation, the quick-disconnect coupling shall Be engaged and disengaged for 1000 engagements. During this test, after each 100 engagements,
32、 the tire valve core and the tire valve adapter extension shall be removed 25 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85352 97 m 7777706 0257775 6 m. . MIL-1-85352 and examined. There shall be no deflection or evidence of failure in eit
33、her component. The tire valve adapter shall be installed a total of 100 times on a standard tire valve stem. The valve adapter shall be disassembled and examined for wear or compression of the gasket. After completion of 1000 engagements and 100 installations the assembly shall be tested to withstan
34、d an integral pressure of 750 psi for 10 minutes. During this time there shall be no indication of leakage. 4.7 Packaging, packing, and marking. Preparation for delivery shall be examined for conformance to section 5. 5. PACKAGING * 5.1 Preservation and packaging. Packaging shall be level A or C in
35、accordance with MIL-STD-794. Preservation shall be Method II in accordance with MIL-P-116 (see 6.2). 5.1.1 Unit packaging. The unit packaging shall be considered as the carrying case complete with the inflator assembly therein. metal carrying case shall be utilized as the interior container. The 5.2
36、 Packing. Packing shall be level A, B, or C in accordance with MIL-STD-794 (see 6.2). 5.3 Marking of shipments, In addition to any special marking required by the contract or order, unit packages, intermediate packages, and shipping containers shall be marked in accordance with MIL-STD-129 (see 6.2)
37、. 6. NOTES 6.1 Intended use. The inflator assembly covered by this specification is intended for the measurement of pneumatic pressure when inflating aircraft tires or any pneumatic receiver having internal pressure from 10 to 600 psi. The dual chuck stem gage is intended for measuring pneumatic pre
38、ssure in aircraft tires or pneumatic receivers from 10 to 600 psi. The inflator assembly and dual chuck stem gage is intended for use at both land base and ship base locations. 6.2 Information for contracting officer. Contracts or orders should specify the following: a. Title, number and date of thi
39、s specification. b. Selection of applicable levels of preservation packaging, and packing required (see 5.1 and 5.2). 26 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-1-85352 49 W 9999906 0257796 4 MIL-1-85352 c. Special marking, if required (s
40、ee 5.3). d. The inflator assemblies, gage elements, dual chuck stem gages or combinations of these should be ordered by part number as specified, see specification sheets 1, 2, 3 and 4. e. Where the first article test samples should be sent and instructions concerning the submittal of the test repor
41、ts (see 4.3.3). f. For Navy procurement: (1) Maintenance instructions and parts list required by para. 6.3 shall be submitted to the Commanding Officer, Naval Air Engineering Center (Attn: Code 92713) Lakehurst, NJ 08733 for approval. .(2) Engineering change procedure in accordance with NAVAIR INST
42、4275.38. The Naval Air Systems Command Department of the Navy, Washington, DC 20360. (Attn: AIR-534) will be responsible for review of Class 1 changes under the contract. The Commanding Officer, Naval Air Engineering Center, Lakehurst, NJ 08733 (Attn: Code 92713) will be responsible for approval of
43、Class II changes. 6.2.1 Contracts or orders should specify the following provisions for first artlcle inspection. 6.2.1.1 Whether first article inspection is required. When a contractor is in continuous production of the inflator assembly or dual chuck stem gages from contract to contract, considera
44、tion should be given to waive the first article inspections. If first article inspection is required, indicate: a. Where the first article inspection is to be conducted (at the contractors plant or Government or commercial laboratory). b. That the approval of first article samples or the waiving of
45、the first article inspection shall not relieve the contractor of his obligation to fulfill all other requirements of the specification and contract. 6.3 Maintenance .instructions and parts list. A loose leaf sheet or sheets shall be provided with each inflator assembly delineating instructions for t
46、he calibration of gage elements, adjustment of the pressure relief valve and any other maintenance functions. In addition, the sheet/sheets shall contain a complete illustrated parts breakdown for the entire inflator assembly including the vendor/subvendors identification and the vendors/subvendors part numbers for all components. 27 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
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