MHT6086-2012 English PDFUS$29.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. MHT6086-2012: Flame burnthrough test for aircraft cargo liners Status: Valid
Basic dataStandard ID: MH/T 6086-2012 (MH/T6086-2012)Description (Translated English): Flame burnthrough test for aircraft cargo liners Sector / Industry: Civil Aviation Industry Standard (Recommended) Word Count Estimation: 1,129 Date of Issue: 11/7/2012 Date of Implementation: 1/11/2012 Issuing agency(ies): Civil Aviation Administration of China MHT6086-2012: Flame burnthrough test for aircraft cargo liners---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Flame burnthrough test for aircraft cargo liners ICS 19 A 21 Civil Aviation Industry Standard of the People's Republic of China Burn-through test of aircraft cargo compartment liner 2012-07-11 released 2012-11-01 Implementation Issued by Civil Aviation Administration of China ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009 This standard was proposed by the Aircraft Airworthiness Certification Department of the Civil Aviation Administration of China. This standard was approved by the Aircraft Airworthiness Certification Department of the Civil Aviation Administration of China. This standard is under the jurisdiction of the China Academy of Civil Aviation Science and Technology. Drafting organization of this standard. The Second Research Institute of Civil Aviation Administration of China. The main drafters of this standard. Xia Zuxi, Xie Fei, Yu Xinhua, Su Zhengliang, Peng Huaqiao, Liu Yourui, Li Wenyan. Burn-through test of aircraft cargo compartment liner1 ScopeThis standard specifies the use of high-intensity, open flames to evaluate the flame penetration resistance of aircraft cargo tank lining materials. This standard is applicable to aircraft cargo compartment lining materials, including repair sheets, seams, joints, fastening equipment, lighting facilities and corners.2 Terms and definitionsThe following terms and definitions apply to this document. 2.1 Burnthrough The flame penetrates the sample or there are obvious cracks, cracks, openings, nicks or other obvious cracks, cracks, openings, nicks, or other causes that can pass the flame Failed hole.3 equipment3.1 Sample holder The sample holder is shown in Figure 1 to Figure 3.The burner should be installed on a rotating device so that it can move away from the sample during preheating. 3.2 Burner 3.2.1 Type The burner should be a gun-type burner. The flame characteristics can be improved by selecting a fixed disc or adjusting piece. If you choose different types of combustion The temperature, heat flux and test results should be compared with gun-type burners. 3.2.2 Nozzle The nozzle of the burner should be able to maintain a certain oil pressure so that its flow rate is 0.126 L/min ± 0.006 L/min. Monarch 80AR or The rated flow of 80R type nozzle should be 0.142 L/min under the pressure of 0.69 MPa, and the rated flow should be 0.142 L/min under the pressure of 0.59 MPa 0.126 L/min, and has a suitable spray shape. 3.2.3 Burner cone The burner cone shall be made of stainless steel or alloy with corrosion resistance, high temperature resistance and a thickness of 1.650 mm ± 0.375 mm. Cone length The degree should be 305 mm ± 3 mm, the opening height is 152 mm ± 6 mm, and the width is 280 mm ± 6 mm, see Figure 4 and Figure 5. 3.2.4 Oil pressure regulator The oil pressure regulator should be able to adjust the fuel flow rate to 0.126 L/min ± 0.006 L/min. 3.2.5 Fuel Aviation kerosene that meets the requirements of GB 6537 should be used. 3.2.6 Air flow The air baffle should be adjusted so that the air flow is about 1.89 m3/min. 3.3 Heat flow meter 3.3.1 Heat flow meter specifications It is advisable to use the total heat flux type foil Gardon heat flow meter, the range is 0～17 W/cm2, and the accuracy should be ±3% of the indicated reading. 3.3.2 Heat flow meter bracket When calibrating, the heat flow meter should be installed on an insulation board with a length of 305 mm ± 3 mm, a width of 152 mm ± 3 mm, and a thickness of 19 mm ± 3 mm. It is connected to the angle steel frame to facilitate the burner to be installed on the test frame during calibration, as shown in Figure 6.Check whether the insulation board is damaged frequently, if necessary, Spacers can be added to adjust the position to ensure that the surface of the heat flow meter is parallel to the exit surface of the burner cone. 3.4 Thermocouple Seven ceramic-encapsulated, metal sheathed, grounded K-type (nickel-chromium-nickel-aluminum) thermocouples with a diameter of 1.6 mm should be used for calibration. It should be an outer diameter of 0.254 mm, a cross-sectional area of 0.0507 mm2, and a resistance of 361 Ω/km (American Wire Gauge 30 AWG). The thermocouple should be fixed to a A thermocouple comb is formed on the angle steel bracket so that it can be placed on the sample holder during calibration (see Figure 7). 3.5 Data Acquisition System A recorder or computer data acquisition system with an appropriate range and calibrated should be used to measure and record the output of thermocouples and heat flow meters. fruit. 3.6 Timer A stopwatch or other timer with an allowable error of ±1 s/h should be used to measure the burning time of the burner, the continuous burning time of the sample and the burn-through time. 3.7 Anemometer A vane-type anemometer should be used to measure the air flow into the burner. In addition to leaving a wind speed detection port in the center, the entire air of the burner The inlet should be completely sealed, see Figure 8. Hot-wire anemometers can also be used to measure wind speed. From the end of the air duct of the oil burner, remove the cone of the oil burner, only turn on the fan without Turn on the fuel and ignition, and adjust the damper to obtain a wind speed of approximately 1.89 m3/min (67 ft3/min). If there is a baffle, remove the baffle first when measuring the wind speed, and then reinstall the baffle and combustion tube after measuring the wind speed. Figure 7 Top and side views of the thermocouple holder Figure 8 Schematic diagram of the position of the anemometer 3.8 Equipment debugging 3.8.1 Except for an opening for the anemometer, the entire air inlet of the oil burner should be completely sealed. Install the anemometer After preparing for measurement, turn on the fan for at least 30 s to make the fan reach its normal operating speed (it is not necessary to turn on the ignition and fuel switch). Air conditioning The baffle makes the air flow rate approximately 1.89 m3/min. Tighten the screws to fix the position of the baffle. 3.8.2 If there is no calibrated flow meter, a measuring cylinder of appropriate size can be used to measure the fuel flow. Turn on the fuel pump and burner to ensure that The fire device is in the closed state, and the plastic tube or rubber tube is installed on the nozzle to collect the fuel volume for 2 minutes, and the flow rate is 0.126 L/min. ±0.006 L/min.4 sample4.1 Sample configuration Each type of cargo tank lining and design configuration should be tested. The design configuration includes design features that affect the flame containment performance of the cargo hold, such as Corners, joints, seams, lighting devices, pressure relief valves, temperature sensors, etc. If the ceiling and side wall panels need to be tested separately, they can be used separately Fire panels replace sidewall panels or ceilings that are not tested. Refractory materials used in recessed lighting facilities and pressure relief valves should be tested in the same way as cargo tank linings. Use in ceiling position The joints, joints and fasteners should extend along the length of the liner so that it is located in the center of the burner cone for testing. Used on the side wall panel The position of the joints and joints should represent the actual use on the aircraft, extending along the length of the liner and 51 mm away from the top, measured according to Chapter 5. Try these design configurations. See Appendix A for patch test. 4.2 Number of samples At least three or three sets of samples should be prepared for each type of siding. A sample group contains at least three cargo tank ceilings and three side wall linings. 4.3 Specimen size 4.4 Sample pretreatment Before the test, the sample should be kept at a temperature of 21 ℃2 ℃ and a relative humidity of 55%10% for at least 24 h.5 Calibration5.1 The burner should be in a suitable position relative to the sample holder, 51 mm ± 3 mm from the side wall frame. Fix the heat flow meter on the bracket and Installed on the sample holder, as shown in Figure 6, 203 mm ± 3 mm from the burner cone mouth, located on the center line of the burner cone. 5.2 Before starting the burner, make sure that there is no soot on the surface of the heat flow meter, and confirm that there is cooling water flowing through the heat flow meter. 5.3 Turn the burner from the test position to the preheating position. Check and remove the deposits, soot, etc. of combustion products in the cylinder. 5.4 When the burner is in the preheating position, turn on the fuel switch and light the burner for at least 2 min. Move the burner back to the test position, Adjust the air intake so that the heat flux density is not less than 8.6 W/cm2.In a time range of at least 30 s, at least an average of at least one thermal record per second Flow density value to ensure stable combustion conditions. When a stable combustion state has been obtained, turn off the burner. 5.5 Replace the heat flow meter with a thermocouple comb, check the thermocouple, and confirm that it is 203 mm ± 3 mm from the horizontal plane of the cone of the burner. Make in A thermocouple in the middle is on the center line of the cone of the burner, as shown in Figure 7. 5.6 Start the burner, preheat it for at least 2 minutes, then move the burner to the test position, and record at least one per second within the 30 s time frame. The temperature of each thermocouple shall not be less than 871 ℃. 5.7 If the temperature of each thermocouple is not within the specified range, repeat 5.1 to 5.6 until all parameters are within the specified range. When the thermoelectric Even if the temperature meets the requirements, check whether the air flow rate is within the specified range. When all parameters are within the specified range, tighten the bolts and fix Air conditioning sheet. 5.8 Before each test, the burner should be calibrated until it is stable (the heat flux and temperature are kept within the calibration range). When stable After the status is confirmed, the flame stability can be rechecked after several consecutive tests.6 Test procedure6.1 Check and clean the soot in the burner cone. 6.2 Install the side wall plate and (or) the ceiling sample on the sample holder, and place the fixed frame, and fix the fixed frame and the sample holder together with bolts. Confirm that the horizontal sample rack is in a horizontal state. 6.3 Install a thermocouple or thermocouple comb at 102 mm±3 mm above the ceiling sample. If a thermocouple comb is used, install a thermocouple in the middle Placed on the center line of the cone of the burner. 6.4 Move the burner to the preheating position. During preheating, the flame does not touch the sample. Turn on the burner to burn for at least 2 minutes to stabilize it. 6.5 Move the burner to the test position and start the timer at the same time. 6.6 Record the temperature of the thermocouple above the sample at least once every second during the test. 6.7 Put the sample in the flame for 5 minutes. If the flame burns through the sample within 5 minutes, the test can be terminated early. 6.8 Turn off the burner and end the test.7 Test report7.1 Describe the test material in detail, including manufacturer, sample type, sample thickness, etc. 7.2 Record the placement position of the test panel (such as the ceiling and/or side wall panels). 7.3 Observe and record the phenomenon (such as delamination, resin ignition, smoke, etc.) and the time when the sample is placed in the flame. 7.4 If flame penetration occurs, report the penetration time of the three samples separately. 7.5 If flame penetration does not occur, report the maximum temperature above the sample and the time it occurred. 7.6 Provide relevant calibration records. ABAppendix A(Normative appendix) Burn-through test of repaired aircraft cargo compartment liner A.1 General A.1.1 This appendix gives the test procedures for repaired cargo tank linings after damage, including but not limited to ceilings, sidewall panels, pressurized cabins Cover plate, fiber lining plate, cabin isolation lining plate. A.1.2 Generally, repair sheets containing glass fiber reinforced materials are used to repair the cracks and cracks caused by wear, illegal operations and accidents on the cargo tank lining. Delamination and perforation. The repair sheet should be coated with intumescent material to prevent delamination and separation in a hot environment. A.2 Sample A.2.1 Sample requirements The type and thickness of the sample should be the same as the material actually used. For liners of different thicknesses, only the maximum thickness and minimum thickness can be test. If the sample is made of similar resins (such as glass fiber reinforced several slightly different phenolic resins), you can only test the conventional structure (glass Glass fiber, phenolic resin). A.2.2 Burn-through test specimen of repair piece A.2.2.1 Sample configuration Flat specimens of the same material as the actual repair sheet should be placed on the ceiling of the cargo tank liner for burn-through resistance test. A.2.2.2 Sample size A.4.2 Burn-through resistance test of the patch patch In addition to the burn-through test, the patch should also be adhered to the lining sample under the same conditions. The repaired liner should be placed on the ceiling The position of the side wall plate of the test equipment can be sealed with a refractory plate. Carry out the test according to Chapter 6, pay attention to covering the standard damage area The positioning of the patch. A.4.3 Burn-through resistance test of the overlapped state of the patch If the crack is long and a single patch is not enough to cover the entire damaged area, the fire resistance of the patch after overlap should be tested. Overlapped The liner of the repair material should be placed in the ceiling position, and the side wall plate position can be sealed with refractory plates, and the test should be carried out according to Chapter 6. A.5 Report A.5.1 Burn-through resistance test of lining board repair sheet A.5.1.1 Report the tested material, including the manufacturer, type of liner, thickness of liner, etc. A.5.1.2 Observe and record the phenomenon of the specimen exposed to flame (such as delamination, resin ignition, smoke, etc.) and the time when these phenomena occur between. A.5.1.3 If flame penetration occurs, report the time. A.5.1.4 If flame penetration does not occur, report the highest temperature above the sample and the time to reach that temperature. A.5.2 Burn-through resistance test of the patch patch A.5.2.1 Report the tested material, including the manufacturer, repair patch type, intumescent coating type (if used), liner type and thickness, and Fixed type (such as riveting), etc. A.5.2.2 Observe and record the phenomenon of the sample exposed to the flame (such as delamination, peeling of the patch from the liner, the edge of the patch, curling Tune, resin catches fire, smoke, etc.) and the time when these phenomena occur. A.5.2.3 If flame penetration or patch stripping occurs, report the time. A.5.3 Burn-through resistance test of the overlapped state of the patch A.5.3.1 Report the tested material, including the manufacturer, repair patch type, expansion coating type (if used), liner thickness and type, and Fixed type (such as riveting), etc. A.5.3.2 Observe and record the phenomenon of the specimen exposed to the flame (such as delamination, separation of the two patch pieces, flame propagation, uplift of the patch edge, Curling, resin fire, smoke, etc.) and the time when these phenomena occur. A.5.3.3 If flame penetration or patch stripping occurs, report the time. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of MHT6086-2012_English be delivered?Answer: Upon your order, we will start to translate MHT6086-2012_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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