Indicated airspeed error due to gradual blocking of pitot tube with drain hole
DOI: https://doi.org/10.3846/aviation.2022.15963Abstract
Problem of pitot tube blocking is persistent because even in the recent past there have been several accidents based on inaccurate information from air speed indicators. This problem was caused by a partial or complete blockage of the total pressure probes. Certain principles of blocking detection are well known. This article describes research into another principle of the gradual blocking detection of the pitot tube with drain holes. Pitot tubes with different blockage ratios were made and tested. A gradual blocking curve was described. The independence of velocity magnitude for the investigated airspeeds was found. This research shows that the drain hole design can be useful for a pitot tube blockage detection. The principle is based on another pitot tube with a larger drain hole area. Airspeed error due to gradual blocking grows faster on the other pitot tube. Gradual blocking of both pitot tubes results in a difference in indicated airspeeds, even at constant speed flight and before full blockage. This airspeed difference can warn a pilot and gives him or her a valuable time to use emergency procedures.
Keywords:
pitot tube, total pressure, static pressure, blocking, unreliable airspeedHow to Cite
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References
AAIB Bulletin 11/2020. (2020). Serious incident. https://assets.publishing.service.gov.uk/media/5f881884e90e07415e7f36c5/Airbus_A321-231_G-WUKJ_11-20.pdf> https://assets.publishing.service.gov.uk/media/5f881884e90e07415e7f36c5/Airbus_A321-231_G-WUKJ_11-20.pdf
Australian Transport Safety Bureau. (2018). Airspeed indication failure on také-off involving Airbus A330, 9M-MTK, Brisbane Airport, Queensland, on July 2018. ATSB. https://www.atsb.gov.au/publications/investigation_reports/2018/aair/ao-2018-053> https://www.atsb.gov.au/publications/investigation_reports/2018/aair/ao-2018-053
Ayra, E. S., Sanz, Á. R., Valdés, R. A., Comendador, F. G., & Cano, J. (2020). Detection and warning of ice crystals clogging pitot probes from total air temperature anomalies. Aerospace Science and Technology, 112, 105874. https://doi.org/10.1016/j.ast.2020.105874> https://doi.org/10.1016/j.ast.2020.105874
Barthe, J. (2007). Unreliable speed. Safety First, 2007(05), 7.
Bureau d’enquêtes et d’analyses pour la sécurité de l’aviation civile. (2012). Final Report: Airbus A330-203. https://reports.aviation-safety.net/2009/20090601-0_A332_F-GZCP.pdf> https://reports.aviation-safety.net/2009/20090601-0_A332_F-GZCP.pdf
European Aviation Safety Agency. (2013). Stall and spin loss of control. https://havarikommissionen.dk/media/9238/ga8.pdf> https://havarikommissionen.dk/media/9238/ga8.pdf
Federal Aviation Administration. (2016). Pilot’s handbook of aeronautical knowledge. https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak> https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak
Freeman, P., Seiler, P., & Balas, G. J. (2011). Robust fault detection for commercial transport air data probes. IFAC Proceedings Volumes, 44(1), 13723–13728. https://doi.org/10.3182/20110828-6-IT-1002.03750> https://doi.org/10.3182/20110828-6-IT-1002.03750
Flight Safety Foundation. (1995). Rejected takeoff in icy conditions results in runway overrun. Accident Prevention, 52(5). https://flightsafety.org/ap/ap_may95.pdf> https://flightsafety.org/ap/ap_may95.pdf
Genito, N., Corraro, F., Garbarino, L., Vitale, A., De Lellis, E., Bibby, D., & Jones, K. G. (2018). U.S. Patent No. 9,983,023. Patent and Trademark Office. https://patentimages.storage.googleapis.com/ed/8d/67/4fcbf0a43452a7/US9983023.pdf> https://patentimages.storage.googleapis.com/ed/8d/67/4fcbf0a43452a7/US9983023.pdf
Guo, D., Wang, Y., Zhong, M., & Zhao, Y. (2018). Fault detection and isolation for Unmanned Aerial Vehicle sensors by using extended PMI filter. IFAC-PapersOnLine, 51(24), 818–823. https://doi.org/10.1016/j.ifacol.2018.09.669> https://doi.org/10.1016/j.ifacol.2018.09.669
Hansen, S., Blanke, M., & Adrian, J. (2010). Diagnosis of UAV pitot tube defects using statistical change detection. IFAC Proceedings Volumes, 43(16), 485–490. https://doi.org/10.3182/20100906-3-IT-2019.00084> https://doi.org/10.3182/20100906-3-IT-2019.00084
Jäckel, R., Tapia, F., Gutiérrez-Urueta, G., & Jiménez, C. M. (2020). Design of an aeronautic pitot probe with a redundant heating system incorporating phase change materials. Flow Measurement and Instrumentation, 76, 101817. https://doi.org/10.1016/j.flowmeasinst.2020.101817> https://doi.org/10.1016/j.flowmeasinst.2020.101817
Jackson, D. A. (2015). Concept of a Pitot tube able to detect blockage by ice, volcanic ash, sand and insects, and to clear the tube. Photonic Sensors, 5(4), 298–303. https://doi.org/10.1007/s13320-015-0272-x> https://doi.org/10.1007/s13320-015-0272-x
Jarvinen, P. O. (2011). U.S. Patent No. 8,060,334. U.S. Patent and Trademark Office.
Japan Transport Safety Board. (2018). Aircraft serious incident investigation report. JTSB. https://www.mlit.go.jp/jtsb/eng-air_report/JA04JJ.pdf> https://www.mlit.go.jp/jtsb/eng-air_report/JA04JJ.pdf
Lv, X., Guan, J., Wang, S., Zhang, H., Xue, S., Tang, Q., & He, Y. (2020). Pitot tube-based icing detection: Effect of ice blocking on pressure. International Journal of Aerospace Engineering, 2020, 1902053. https://doi.org/10.1155/2020/1902053> https://doi.org/10.1155/2020/1902053
Nathan, V. T., & Anandappan, T. (2014). U.S. Patent No. 8,914,164. U.S. Patent and Trademark Office.
National Transportation Safety Board (NSTB). (2013). NTSB Identification: ERA12FA115. https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20111220X20005&key=1> https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20111220X20005&key=1
Oxford Aviation Academy. (2008). Aircraft General Knowledge, 4. United Kingdom.
Parker, Ch. L. (2007). 12 Steps to safe takeoffs. AOPA. https://www.aopa.org/news-and-media/all-news/2007/june/flight-training-magazine/12-steps-to-safe-takeoffs> https://www.aopa.org/news-and-media/all-news/2007/june/flight-training-magazine/12-steps-to-safe-takeoffs
Sun, K., & Gebre-Egziabher, D. (2020, April). A fault detection and isolation design for a dual pitot tube air data system. In 2020 IEEE/ION Position, Location and Navigation Symposium (PLANS) (pp. 62–72). IEEE. https://doi.org/10.1109/PLANS46316.2020.9110179> https://doi.org/10.1109/PLANS46316.2020.9110179
The Interstate Aviation Committee. (2018). Accident investigation Antonov An-148-100B. https://mak-iac.org/en/rassledovaniya/an-148-100b-ra-61704-11-02-2018/> https://mak-iac.org/en/rassledovaniya/an-148-100b-ra-61704-11-02-2018/
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Copyright (c) 2022 The Author(s). Published by Vilnius Gediminas Technical University.
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