Lab 10

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LeTourneau University *

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2231

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Mechanical Engineering

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Dec 6, 2023

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LeTourneau University AVTC2231 Intro Aircraft Systems Laboratory PROJECT NUMBER: AVTC2231-10 TITLE: Aircraft Landing Gear Systems REFERENCE(S): ASA-A Textbook Pg. 433-438 AC65-15A Pg. 348-356 Fluid Power for Aircraft Pg. 179-200 Piper PA23-150 Service Manual (on microfiche) Piper PA28-R200 Service Manual (on microfiche) Bellanca Super Viking Service Manual https://www.aircraftsystemstech.com/2017/04/aircraft-landing- gear-systems.html LAB EQUIPMENT: PA23-150 Piper “Apache” Landing Gear Mock-up 17-31 Bellanca “Super Viking” Landing Gear Mock-up PA28-R200 Piper “Arrow” Landing Gear REQUIRED TOOLS: Multi-meter Carpenter’s Square Pressure Gauge LAB OBJECTIVES: 1. The student will inspect, check, service, troubleshoot and repair an aircraft retractable landing gear system. LAB OVERVIEW: This lab will give you an opportunity to work with three different landing gear retraction systems. The Electro-hydraulic / Power Pack type of system is used extensively in small, retractable gear aircraft, yet there are many similarities in operation to large aircraft systems. LAB PREPARATION: 1. Read the ASA textbook reference listed above. LAB PROCEDURES: 1. Utilizing the lab mock-up and the Service Manual, analyze the Apache landing gear system. (20 min.) A. Raise and lower the landing gear using the hand pump. B. Inspect the nose wheel centering mechanism operation during gear extension. C. Locate the emergency extension gas cylinder and trace fluid lines. D. Have your instructor visit and sign off this step. 2. Utilizing the Arrow & the Service Manual, analyze the Arrow landing gear system. (40 min.) School of Aeronautical Science Page 10 - a
LeTourneau University A. Locate the auto-extend airspeed sensor located on the left side of the aircraft fuselage. B. Gain access to the cockpit, raise the rear seat & locate the auto-extend diaphragm assembly. C. Locate the auto-extend override lever on the center console next to the pilot seat. Move the lever up and note how the auto-extend system is overridden. 1) Explain this system to your instructor , and get a sign-off . D. Check main landing gear wheel alignment. 1) Be prepared to explain the method of adjusting the alignment. 2) Have your instructor sign off this step. 3. Analyze and troubleshoot the Viking landing gear system. (50 min.) A. Check fluid level of hydraulic power pack. B. Check charge of Accumulator & record on sign-off sheet. C. Connect a 12-volt power source to the mockup. D. Operate the landing gear and have your instructor introduce a “problem”. E. Using the schematic provided, troubleshoot the problem introduced by your instructor. F. Have your instructor sign off this step. Note: This project must be completed before the beginning of the next lab. LAB REPORT: Answer the following questions: 1. As designated in the textbook, what type of hydraulic system is used on the three systems studied? Power pack system 2. What is the source of power for the hydraulic pump on the Apache? What is the Apache’s emergency source? The Arrow’s primary source? The Viking’s? Apache – Emergency air charge, electrically powered, reversible pump. Arrow – Electrically powered reversible pump. Viking – Electrically driven hydraulic reversible pump. 3. On the Bellanca system, what conditions will cause the gear warning horn to sound? It will sound when the gear is not down and locked. 4. Where are the switches that operate the landing gear indicator lights located on the Apache and Arrow landing gear systems? In the wheel well where the limit switches are 5. Explain how landing gear retraction is prevented when the aircraft is on the ground for each of the three aircraft studied. Arrow – Uses a squat switch. Apache – Uses a hydraulic valve. Viking – Uses a squat switch 6. On the Apache and Viking, what holds the landing gear up in flight? The hydraulic pressure. 7. Describe the emergency extension method used on each of the three landing gear systems studied. Do any have an emergency system? Describe its operation. Apache – Air charge, the handle punctures the air cannister. Viking – Uses a dump valve to release the pressure, gravity and the weight of the landing gear are what lowers it. Apache – Hydraulic pressure to release, gravity and weight of the component are what lowers it. School of Aeronautical Science Page 10 - b
LeTourneau University 8. How is toe-in and toe-out adjusted on main landing gear? There are shims in the torque links 9. Name at least one method to align the nose with the rudder pedal position when the nose landing gear is extended. It can be done by adjusting the bell crank and using push rods to align it. School of Aeronautical Science Page 10 - c
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LeTourneau University Name:_____________________ Instructor Signoff Sheet for Project #10 Signature 1. PA23-150 “Apache” System explanation 2. PA28-R200 “Arrow” System explanation PA28-R200 “Arrow” Gear alignment 3. 17-31 “Super Viking” Pressure: 17-31 “Super Viking” Troubleshooting Scoring: 10 Cover Sheet/Format/etc. 15 Questions 5 Misc. ___________________________ 30 Total Points School of Aeronautical Science Page 10 - c