Cryogenic oil leakage failure of aviation hydraulic pumps can be a critical issue due to the impact on hydraulic system performance and reliability. Here are some possible causes and troubleshooting steps to resolve this failure: Reasons for low temperature oil leakage: 1. Cold shrinkage: At low temperatures, hydraulic oil may shrink, causing seals and gaskets to shrink and possibly causing oil leakage. 2. Seal hardening: Low temperature will cause the sealing material to harden, lose its elasticity and cause oil leakage. 3. Deterioration of seals: If the seals are not compatible with the hydraulic oil used, they may deteriorate at low temperatures, resulting in oil leakage. 4. Improper installation of seals: Improper installation techniques of seals or damage of seals during assembly will lead to low temperature oil leakage. 90-R-075-KA-1-CD-80-S-3-C7-D-03-GBA-35-35-24 90R075KA1CD80S3C7D03GBA353524 90-R-075-KA-1-CD-80-S-3-C7-E-03-GBA-20-20-24 90R075KA1CD80S3C7E03GBA202024 90-R-075-KA-1-CD-80-S-4-C7-E-03-GBA-35-35-20 90R075KA1CD80S4C7E03GBA353520 90-R-075-KA-1-CD-80-S-4-S1-D-03-GBA-42-42-20 90R075KA1CD80S4S1D03GBA424220 90R075-KA-1-NN-60-L-3-C7-D-03-GBA-38-38-20 90R075KA1NN60L3C7D03GBA383820 90-R-075-KA-1-NN-60-L-3-C7-D-03-GBA-38-38-20 90R075KA1NN60L3C7D03GBA383820 90R075-KA-1-NN-60-L-4-C7-E-03-GBA-42-42-24 90R075KA1NN60L4C7E03GBA424224 90-R-075-KA-1-NN-60-L-4-C7-E-03-GBA-42-42-24 90R075KA1NN60L4C7E03GBA424224 90-R-075-KA-1-NN-60-L-4-S1-D-03-GBA-20-20-24 90R075KA1NN60L4S1D03GBA202024 90R075-KA-1-NN-60-P-3-C7-E-05-GBA-35-42-24 90R075KA1NN60P3C7E05GBA354224 90-R-075-KA-1-NN-60-P-3-C7-E-05-GBA-35-42-24 90R075KA1NN60P3C7E05GBA354224 90-R-075-KA-1-NN-60-P-3-S1-D-03-GBA-35-35-20 90R075KA1NN60P3S1D03GBA353520 90-R-075-KA-1-NN-60-P-4-S1-D-03-GBA-38-38-24 90R075KA1NN60P4S1D03GBA383824 90-R-075-KA-1-NN-60-P-4-S1-D-03-GBA-38-38-24-F001 90R075KA1NN60P4S1D03GBA383824F001 90-R-075-KA-1-NN-60-R-3-S1-D-03-GBA-29-29-24 90R075KA1NN60R3S1D03GBA292924 90-R-075-KA-1-NN-60-R-3-S1-D-03-GBA-42-42-24 90R075KA1NN60R3S1D03GBA424224 90R075-KA-1-NN-60-R-3-S1-D-03-GBA-42-42-24 90R075KA1NN60R3S1D03GBA424224 90-R-075-KA-1-NN-60-R-3-S1-D-05-GBA-42-42-24 90R075KA1NN60R3S1D05GBA424224 90-R-075-KA-1-NN-60-R-3-S1-E-03-GBA-38-38-20 90R075KA1NN60R3S1E03GBA383820 90-R-075-KA-1-NN-60-R-4-S1-C-03-GBA-29-29-24 90R075KA1NN60R4S1C03GBA292924 Troubleshooting steps: 1. Inspection: Thoroughly inspect the hydraulic pump and related components for any visible signs of oil leakage, such as oil stains, wet surfaces or oil pools. 2. Seal inspection: Check the condition of the seals, gaskets and O-rings inside the hydraulic pump. Look for signs of hardening, cracking or deterioration. 3. Compatibility analysis: Verify that the seals used are compatible with the hydraulic oil specified in the aviation system. Make sure the seal is designed to withstand low temperature conditions. 4. Temperature Control: Evaluate the temperature control mechanism within the hydraulic system. Ensure that the system maintains the required operating temperature range in cryogenic conditions. Consider using insulation or heating elements to prevent excessive cooling. 5. Replace seals: If a seal shows signs of damage or is not compatible with cryogenic conditions, replace with a seal designed for cold environments. Follow the manufacturer's recommendations for proper installation techniques. 6. Lubrication: Make sure the hydraulic pump is adequately lubricated with oil suitable for low temperature conditions. Consider using oils with improved low-temperature properties or additives designed to improve cold-environment performance. 7. System Test: After addressing potential causes and making necessary repairs or replacements, perform a system test to verify the effectiveness of the troubleshooting steps. Monitor for signs of oil leakage in low temperature conditions. Maintenance Monitoring: Implement regular maintenance measures to ensure proper seal function and monitor hydraulic pumps for signs of oil leakage or abnormal operation, especially during low temperature operation. 9. System Design Evaluation: The hydraulic system design is evaluated to identify any potential design flaws or weaknesses that could result in cryogenic oil leakage. This evaluation may involve examining the routing of hydraulic piping, the selection of components, and the configuration of the overall system. Make any necessary modifications or improvements to improve the system's resistance to low temperature oil spills. 90-R-075-KA-1-NN-60-R-4-S1-E-03-GBA-26-26-24 90R075KA1NN60R4S1E03GBA262624 90-R-075-KA-1-NN-60-R-4-S1-E-03-GBA-35-35-24 90R075KA1NN60R4S1E03GBA353524 90R075-KA-1-NN-60-S-3-C6-D-03-GBA-35-35-20 90R075KA1NN60S3C6D03GBA353520 90-R-075-KA-1-NN-60-S-3-C6-D-03-GBA-35-35-20 90R075KA1NN60S3C6D03GBA353520 90-R-075-KA-1-NN-60-S-3-C7-D-03-GBA-14-14-20 90R075KA1NN60S3C7D03GBA141420 90-R-075-KA-1-NN-60-S-3-C7-D-03-GBA-17-17-24 90R075KA1NN60S3C7D03GBA171724 90R075-KA-1-NN-60-S-3-C7-D-03-GBA-35-35-24 90R075KA1NN60S3C7D03GBA353524 90-R-075-KA-1-NN-60-S-3-C7-D-03-GBA-35-35-24 90R075KA1NN60S3C7D03GBA353524 90-R-075-KA-1-NN-60-S-3-C7-D-03-GBA-38-38-20 90R075KA1NN60S3C7D03GBA383820 90R075-KA-1-NN-60-S-3-C7-D-03-GBA-38-38-24 90R075KA1NN60S3C7D03GBA383824 90-R-075-KA-1-NN-60-S-3-C7-D-03-GBA-38-38-24 90R075KA1NN60S3C7D03GBA383824 90-R-075-KA-1-NN-60-S-3-S1-D-03-GBA-32-32-24 90R075KA1NN60S3S1D03GBA323224 90R075-KA-1-NN-60-S-3-S1-D-03-GBA-42-42-24 90R075KA1NN60S3S1D03GBA424224 90-R-075-KA-1-NN-60-S-3-S1-D-03-GBA-42-42-24 90R075KA1NN60S3S1D03GBA424224 90-R-075-KA-1-NN-60-S-3-S1-D-04-GBA-35-35-24 90R075KA1NN60S3S1D04GBA353524 90-R-075-KA-1-NN-60-S-3-T2-D-03-GBA-20-20-24 90R075KA1NN60S3T2D03GBA202024 90-R-075-KA-1-NN-60-S-3-T2-E-03-GBA-26-26-24 90R075KA1NN60S3T2E03GBA262624 90-R-075-KA-1-NN-60-S-4-C6-D-03-GBA-42-42-24 90R075KA1NN60S4C6D03GBA424224 90-R-075-KA-1-NN-60-S-4-S1-D-00-GBA-38-38-24 90R075KA1NN60S4S1D00GBA383824 90-R-075-KA-1-NN-60-S-4-S1-D-03-GBA-35-35-24 90R075KA1NN60S4S1D03GBA353524 10. Environmental protection: If the hydraulic pump is exposed to extreme low temperature environments, consider implementing additional protective measures. This may include isolating hydraulic lines, adding heating elements, or using thermal blankets to keep hydraulic oil temperatures within acceptable limits. 11. Fluid compatibility test: verify the compatibility of hydraulic oil with low temperature conditions. Some hydraulic fluids may have better performance characteristics at low temperatures, such as improved viscosity characteristics or additives designed for cold environments. Consult the fluid manufacturer or seek expert advice to ensure the hydraulic fluid selected is suitable for the operating conditions. 12. Regular inspection and maintenance: establish a regular inspection and maintenance plan for hydraulic pumps and related components. Check regularly for signs of oil leaks, monitor seal condition, and follow manufacturer recommendations for preventive maintenance tasks such as replacing seals or lubricating. This proactive approach helps identify potential problems before they escalate and ensures that hydraulic systems operate reliably at low temperatures. 13. Recording and Analysis: Maintain comprehensive records of maintenance activities, failure occurrences, and troubleshooting steps taken. This documentation facilitates analysis and trend identification over time. By analyzing the data, recurring problems can be identified, the effectiveness of implemented solutions can be assessed, and informed decisions can be made for future maintenance and improvements. 90-R-075-KA-1-NN-80-D-3-S1-L-03-GBA-29-29-24 90R075KA1NN80D3S1L03GBA292924 90-R-075-KA-1-NN-80-L-3-C7-D-03-GBA-32-32-28 90R075KA1NN80L3C7D03GBA323228 90R075-KA-1-NN-80-L-3-S1-D-00-GBA-42-42-24 90R075KA1NN80L3S1D00GBA424224 90-R-075-KA-1-NN-80-L-3-S1-D-00-GBA-42-42-24 90R075KA1NN80L3S1D00GBA424224 90-R-075-KA-1-NN-80-L-3-S1-D-03-GBA-20-20-24 90R075KA1NN80L3S1D03GBA202024 90-R-075-KA-1-NN-80-L-3-S1-E-03-GBA-35-35-24 90R075KA1NN80L3S1E03GBA353524 90-R-075-KA-1-NN-80-L-4-S1-D-03-GBA-14-14-24 90R075KA1NN80L4S1D03GBA141424 90-R-075-KA-1-NN-80-P-3-C7-D-03-EBC-35-35-24 90R075KA1NN80P3C7D03EBC353524 90-R-075-KA-1-NN-80-P-3-C7-D-03-GBA-35-35-24 90R075KA1NN80P3C7D03GBA353524 90R075-KA-1-NN-80-P-3-C7-D-03-GBA-42-42-24 90R075KA1NN80P3C7D03GBA424224 90-R-075-KA-1-NN-80-P-3-C7-D-03-GBA-42-42-24 90R075KA1NN80P3C7D03GBA424224 90-R-075-KA-1-NN-80-P-3-S1-D-00-GBA-42-42-24 90R075KA1NN80P3S1D00GBA424224 90-R-075-KA-1-NN-80-P-3-S1-D-03-EBC-35-14-24 90R075KA1NN80P3S1D03EBC351424 90-R-075-KA-1-NN-80-P-3-S1-D-03-GBA-29-29-24 90R075KA1NN80P3S1D03GBA292924 90-R-075-KA-1-NN-80-P-3-S1-E-03-GBA-20-20-24 90R075KA1NN80P3S1E03GBA202024 90-R-075-KA-1-NN-80-P-4-C7-E-03-GBA-32-32-24 90R075KA1NN80P4C7E03GBA323224 90-R-075-KA-1-NN-80-P-4-S1-D-00-GBA-17-17-20 90R075KA1NN80P4S1D00GBA171720 90-R-075-KA-1-NN-80-P-4-S1-D-00-GBA-42-42-24 90R075KA1NN80P4S1D00GBA424224 90-R-075-KA-1-NN-80-R-3-C7-D-00-GBA-35-35-24 90R075KA1NN80R3C7D00GBA353524 90-R-075-KA-1-NN-80-R-3-S1-D-00-GBA-35-35-24 90R075KA1NN80R3S1D00GBA353524 14. Expert consultation: If the low temperature oil leakage fault persists or is particularly difficult to diagnose and solve, please seek the expertise of an aviation hydraulic system expert. They can provide insights, guidance and advanced diagnostic techniques to help effectively resolve specific issues. 15. Compliance: Ensure that any modifications, repairs or maintenance procedures performed on aviation hydraulic systems comply with relevant aviation regulations and standards. Adherence to safety guidelines and compliance with industry requirements are critical to maintaining the airworthiness and reliability of aircraft. Remember, safety is paramount when dealing with aircraft hydraulics. It is critical to involve qualified professionals, adhere to industry standards and guidelines, and follow manufacturer recommendations for troubleshooting, repair, and maintenance.