1、 MIL-PRF-24623/7A 03 July 2013 SUPERSEDING MIL-PRF-24623/7 27 August 2010 PERFORMANCE SPECIFICATION SHEET SPLICE, MECHANICAL, SIMPLEX FIBER OPTIC CABLE, AIRCRAFT This specification is approved for use by all Departments and Agencies of the Department of Defense The requirements for acquiring the pro
2、duct described herein shall consist of this specification sheet and MIL-PRF-24623. SCOPE: The performance requirements specified herein cover mechanical splices suitable for military aircraft use with single fiber (simplex) optical cables containing either multimode or single mode optical fibers. EN
3、VELOPE DIMENSIONS Designation Description Dimension (max) (mm) (inch) D1 maximum diameter of strain relief capture mechanism section 4/ 4/ D2 maximum diameter of barrel (body) section 7.0 0.28 D3 maximum diameter of barrel section with heat shrink applied 8.0 0.31 L1 maximum length of barrel (body)
4、section 40.0 1.59 L2 maximum length of mechanical splice (strain relief capture mechanism from one end to other end) 57.0 2.25 L3 maximum length of mechanical splice with heat shrink applied (one end of heat shrink to other end) 89.0 3.50 NOTES: 1. Dimensions are in millimeters. 2. Inch equivalents
5、are given for general information only. 3. Minimum splice length is preferred. 4. Dimension D1 is defined in terms of diameter compatibility with the crimp tool (see “Cable strain relief capture mechanism”). 5. Maximum dimension of heat shrink specified is before shrinkage. Length of heat shrink pro
6、vided (before shrinkage) shall not be less than 70 mm (2.75 in). FIGURE 1. Mechanical splice, single fiber cable, aircraft. AMSC N/A FSC 6060 METRIC Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24623/7A 2 Part or identifying number (PIN):
7、See table I and 6.6 of MIL-PRF-24623. M 24623 /7 -XXXX Prefix Basic Specification SICC code specification sheet (see table I) TABLE I. Splice Identification Color Coding (SICC) numbers and insertion loss for specified optical fiber sizes. Fiber size (core/cladding) microns (um) SICC Insertion loss 1
8、/ Style 1 Style 2 Initial (dB) Verification (dB) 3/ Single mode 99 percent pure) isopropyl alcohol prior to the test. Prepare the salt solution as specified in 8.1 of ASTM B117 ensuring proper pH (see 8.2 of ASTM B117). Purity shall be greater than 99 percent of SO2gas in cylinder. Verify that test
9、samples are suspended in the chamber at an angle from 6oto 45ofrom the vertical. Operate the modified SO2/salt spray (fog) chamber with a constant salt spray introducing SO2gas for 1 hour four times a day (every 6 hours in accordance with A.4.4.4.1 of ASTM G85). Test duration (exposure period) shall
10、 be 336 hours. Introduce the SO2gas at a flow rate of 1 cubic centimeter per minute per cubic foot (cm3/min-ft3) (35 cubic centimeters per minute per cubic meter (cm3/min-m3) of cabinet volume using a method to ensure uniform dispersion throughout the chamber interior (such as gas dispersion ring).
11、Measure the salt spray (fog) fallout rate at intervals of every 24 hours and ensure fallout has specified pH (2.5 to 3.2) and a rate of 1 to 3 ml/80cm2/hr. After the exposure period, remove the test samples from the chamber. Clean test samples by gently washing or dipping in running tap water (not w
12、armer than 38o C (100o F) for at least 5 minutes. Dry immediately with a stream of clean, dry compressed air or inert gas. Once cleaned and dried, the assemblies shall be examined under three-power magnification for modified SO2/salt penetration into the connector junction area and damage to externa
13、l parts. Adequate safety measures must be taken during this test. Fallout rate measurements and otherwise opening of the chamber shall not occur during an SO2cycle (dispersion period). Once the chamber is opened, sufficient time must be allotted for exhaust hood or other means of ventilation to remo
14、ve the SO2atmosphere prior to exposure to the chamber interior. No visible evidence of modified SO2/salt penetration into the mechanical splice sealed area shall be observed. No corrosive effects shall be seen on the external parts (including barrel and strain relief capture mechanism) which would b
15、e detrimental to the operation of the mechanical splice. Insertion loss verification requirement shall be met. Fluid immersion. Applicable except that specimens (each mechanical splice (cable assembly) and each sample of polymeric material) shall be exposed to the all of the fluids at the temperatur
16、es specified in table 3409-AI, Measurement 3409 of MIL-STD-1678-3 for temperature range 2. Specimens shall be maintained at ambient conditions for a minimum of 4 hours prior to fluid testing. After immersion, all specimens shall be drained (for at least 10 minutes), blotted to Provided by IHSNot for
17、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24623/7A 12 remove excess fluid (without scrubbing or mechanically interact), rinsed with moderate agitation (using only a back and forth or up and down type motion) for a maximum of 30 seconds in isopropyl alcohol (
18、TT-I-735), blotted dry (without scrubbing or mechanically interact), and air dried for a minimum of one hour prior to inspection and transfer to subsequent fluid. Prior to and after testing, the mechanical splice shall be visually examined and the separate polymeric samples shall be visually and dim
19、ensionally examined. Flammability. Test samples (mechanical splices on single fiber cable) shall be tested in accordance with EIA-364-81 and as specified herein. Test samples shall be exposed to a 19 mm (.75 inch) flame height applied for ten seconds to the region of the fiber-to-fiber interface. Th
20、e change in optical transmittance shall be measured during the test and after the test once the test sample has returned to room temperature. The test samples shall then be exposed to a 38.1 mm (1.50 inch) flame height applied for 60 seconds to the mechanical splice-cable interface region. Environme
21、ntal performance. The environmental tests in table II shall be performed in the sequence listed. The environmental tests shall be performed per the applicable TIA-455 series or otherwise cited test standards with the exception of adhering strictly to any deviations, constraints or augmentations in t
22、he applicable 3300 series Measurements in MIL-STD-1678-3. Post exposure optical transmittance measurements may be taken up to 24 hours after completion of the environmental exposure. Thermal shock. Test samples (mechanical splices in single fiber cable) shall be tested in accordance with TIA/EIA-455
23、-71, schedule C-0 (5 cycles). The mechanical splices shall be visually examined after the test. Mechanical splices shall not be damaged, and there shall be no loosening of parts, leaking of index matching fluid, or other damage detrimental to the operation of the mechanical splice. Types 1 and 2 cab
24、les. The temperatures of -55C +0 -5C and 165C +5/-0C shall be used for the low and high soak temperatures, respectively. The change in optical transmittance shall be measured during (towards the end of each soak temperature) and after the test. The requirement for the change in optical transmittance
25、 shall be met during and after the test. Type 3 cable. The temperatures of -40C +0/-5C and 70C +5/-0C shall be used for the low and high soak temperatures, respectively. The change in optical transmittance shall be measured after the test. Temperature/humidity cycling. Applicable with the following
26、modification. During and after the temperature/humidity cycling test, the mechanical splice shall meet the requirements of the change in optical transmittance. A post test visual examination of the test specimens shall reveal no leakage of waterproofing compounds or other apparent loss of sealing ca
27、pability, no surface or identification marking impairment, nor any damage detrimental to the operation of the test specimens. Temperature cycling. Mechanical splices shall be tested in accordance with TIA-455-3 using the setup and procedure specified in measurement 3301 of MIL-STD-1678-3 with the te
28、mperature profile in table 3301-III for mechanical splices with types 1 and 2 cables and tested in accordance with TIA-455-3 using the setup and procedure specified in measurement 3301 of MIL-STD-1678-3 with the temperature profile in table 3301-I for mechanical splices with type 3 cable. The change
29、 in optical transmittance shall be measured during and after the test. At a minimum for the “during test” measurements, an optical transmittance measurement shall be performed towards the end of each soak period (maintain step) after every cycle. A post test visual examination of the test specimens
30、shall reveal no leakage of waterproofing compounds or other apparent loss of sealing capability, no surface or identification marking impairment, nor any damage detrimental to Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24623/7A 13 the op
31、eration of the mechanical splice. The operating temperature range shall be as specified in table 3301-III for the types 1 and 2 cables between the temperatures of -28 to +65 C (-18 to +150 F) for type 3 cable. Test fixtures, if used must be of minimum mass and approved by the qualifying activity. No
32、 other mass (item that causes significant thermal lag) shall be added inside the chamber. Temperature life. Test samples (mechanical splices in single fiber cable) shall be tested in accordance with TIA-455-4. The change in optical transmittance shall be measured after the test. The mechanical splic
33、es shall be visually examined after the test to the extent feasible inside the cable harnesses. Mechanical splices shall not be damaged, and there shall be no loosening of parts, leaking of index matching fluid or other damage detrimental to the operation of the mechanical splice. The requirement fo
34、r the change in optical transmittance shall be met after the test. Performance of a cable/fiber retention test is not required as part of the final inspection for this test. Types 1 and 2 cable. The high exposure temperature shall be 165C +5, -0C for the duration of 1,000 hours. Type 3 cable. The hi
35、gh exposure temperature shall be 110C +5, -0C for the duration of 240 hours. Altitude immersion. Mechanical splices shall be tested in accordance with TIA-455-15. The complete sample shall be located within the chamber, with the mechanical splice submerged in a distilled water tank within the chambe
36、r. Instrument end connections shall not be submerged and shall be either routed outside the chamber or to an optical interface port. The change in optical transmittance shall be measured during and after the test (see MIL-PRF-24623 paragraph 4.6.3.4). During each test cycle, optical transmittance me
37、asurements shall be made at each ramp and during the plateau. The requirements for change in optical transmittance shall be met during and after the test. TABLE III. Temperature cycling steps for types 1 and 2 cables. Step Cycle Action Temperature C (F) Duration 1/ 1 1 Maintain 25 +/-2 (77 +/-4) 4 h
38、ours (minimum) 2 Ramp to -40 +0/-3 (-40+0/-5) 16.5 minutes (maximum) 3 Maintain -40 +0/-3 (-40+0/-5) 15 minutes (minimum) 4 Ramp to +85 +3/-0 (185 +5/0) 31.25 minutes (maximum) 5 Maintain 85 +3/-0 (85 +5/-0) 15 minutes (minimum) 6 2 Ramp to -40 +0/-3 (-40+0/-5) 31.25 minutes (maximum) 7 Maintain -40
39、 +0/-3 (-40+0/-5) 15 minutes (minimum) 8 Ramp to +85 +3/-0 (185 +5/0) 31.25 minutes (maximum) 9 Maintain 85 +3/-0 (185 +5/-0) 15 minutes (minimum) 10 3-500 Repeat steps 6 thru 9, 498 additional times, for a total of 500 cycles. 11 Post 500 Ramp to 25 +/-2 (77 4) 35 minutes (maximum) 12 Maintain 25 +
40、/-2 (77 4) 4 hours (minimum) Water pressure. Not applicable. Freezing water immersion. Not applicable. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24623/7A 14 Nuclear radiation resistance. Not applicable. Inspections of mechanical splices
41、 in a cable harness. Test sample configuration. Each mechanical splice is to be terminated onto the ends of single fiber cables (with other cable ends connectorized for attachment to optical test measurement instrumentation). These cable assemblies shall then be incorporated into a cable harness as
42、specified in MIL-STD-1678-4 Requirement 4014. Cable used, test sample configurations, fabrication methods and the specific test methods and practices shall be as specified in MIL-STD-1678-4 Requirement 4014. Mechanical splices, selected from the group that underwent inspections for un-terminated ter
43、mini, shall be used. A minimum sample size as specified in table II shall be used. Optical performance. The optical tests in table II shall be performed in the sequence listed. Tests shall be performed with same constraints specified for mechanical splices as part of a single fiber cable. Mechanical
44、 performance. The mechanical tests in table II shall be performed in the sequence listed. For a mechanical splice on single mode fiber, a discontinuity is considered to be a reduction of optical transmittance of 0.5 dB or more for a duration of 50 microseconds or more (during vibration) or 100 milli
45、seconds or more (during shock). The mechanical tests cited shall be performed per the applicable TIA-455 series or otherwise cited test standards with the exception of adhering strictly to any deviations, constraints or augmentations in the applicable 3200 series Measurements in MIL-STD-1678-3. Mech
46、anical shock. Test samples (mechanical splices in cable harnesses) shall be tested in accordance with the applicable mechanical shock test listed below. Optical discontinuities shall be measured during the test. A minimum of four mechanical splices shall be monitored for discontinuity. The change in
47、 optical transmittance shall be monitored after the test. The mechanical splice shall be visually examined after the test to the extent feasible inside the cable harness. Mechanical splices shall not be damaged and there shall be no loosening of parts or leakage. The requirement for optical disconti
48、nuity shall be met during the test and the requirement for the change in optical transmittance shall be met after the test. a. MIL-S-901. Test samples shall be tested in accordance with MIL-S-901, grade A, type B, class I. Standard shock fixture 4A for bulkhead mounting shall be used. Supplement tes
49、t fixture with mounting shall be performed as specified in MIL-STD-1678-4 Requirement 4014. b. Half-sine pulse. Test samples shall be tested in accordance with TIA-455-14, test condition D. Three shocks in each direction shall be applied along the three mutually perpendicular axes of the test sample (18 shocks). Vibration. Test samples (mechanical splices in cable harnesses) shall be tested for sinusoidal and random vibration in accordance with
