Lab 12

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LeTourneau University *

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2231

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Mechanical Engineering

Date

Dec 6, 2023

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4

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LeTourneau University AVTC2231 Intro Aircraft Systems Laboratory PROJECT NUMBER: AVTC2231-12 TITLE: Oxygen Systems REFERENCE(S): ASA-A Textbook Pg. 667-679 AC65-15A Pg. 587-601 https://www.aircraftsystemstech.com/2017/05/aircraft-oxygen- systems-and-components.html https://www.aircraftsystemstech.com/2017/05/oxygen-system- servicing.html LAB EQUIPMENT: Oxygen System Components LAB OBJECTIVES: 1. The student will inspect, check, troubleshoot, service and repair aircraft oxygen systems including demand-flow regulators. LAB OVERVIEW: This lab will give you an overview of aircraft oxygen systems. These systems are often required only for emergency situations and may go for long periods of time without use. It is critical that these systems be kept in proper working condition. LAB PREPARATION: 1. Read the ASA textbook reference listed above. LAB PROCEDURES: 1. Using the references listed above, answer the following questions. (60 min.) A. Describe a complete 100-hour inspection of an installed oxygen system. B. According to the Airframe textbook, what different types of oxygen cylinders are used in aircraft? (Give a description of the different types of bottles including color.) High (green) and low (red) pressure oxygen cylinders. C. What markings and identification numbers are required on oxygen bottles installed in aircraft? The specification number and the date of when the hydrostatic test was done D. How frequently are the different types of oxygen bottles required to be hydrostatically tested? What pressures are used for the different types of bottles? E. What is the life limit for oxygen bottles used in aircraft? 24 years F. According to AC65-15, what may be used to clean or flush oxygen systems? A mixture of chlorinated, fluorinated hydrocarbons. School of Aeronautical Science Page 12 - a
LeTourneau University G. Give the procedures for purging oxygen systems. When must this procedure be completed? Fill and then drain the system, it should be done whenever there are suspected contaminants in the system. H. Describe the correct method of charging an aircraft oxygen system using a servicing trailer with multiple cylinders (cascade setup). Why is this method more efficient? I. Utilizing both the ASA Airframe textbook and AC65-15, compile a list of at least six safety precautions that should be observed when servicing oxygen systems. No tools with oil or grease Avoid servicing electrical wiring No petroleum-based lubricants or oil-based fluids No smoking School of Aeronautical Science Page 12 - b
LeTourneau University J. According to the ASA Airframe text and AC665-15, what methods can be used to locate a leak in an oxygen system? Spray non petroleum-based soap and look for bubles Why are oxygen system leaks critical? It can lower the pressure K. Using the chart on page 676, determine the charging pressure of a DOT-3AA-1800 cylinder if the ambient air temperature is 85 o . L. What should be done with a cylinder that has been discharged for an undetermined amount of time? It shouldn’t be used M. Describe the operation of a chemical oxygen candle or oxygen generator. Where are these systems typically used? It is used as an emergency backup in aircrafts, it supplies oxygen to the system by using the candle. 2. Inspect the oxygen system components provided. (50 min.) A. Determine airworthiness of each making a list of defects. B. Be prepared to describe the operation of continuous flow systems including regulators and masks. C. Be prepared to describe the operation of demand type oxygen systems including pressure demand and diluter demand regulators. D. Have instructor over for a visit & sign-off. LAB REPORT: 1. Report the answers to the questions in step 1 above. 2. Report list of defects found in step 2 above. School of Aeronautical Science Page 12 - c
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LeTourneau University Name:_____________________ Instructor Signoff Sheet for Project #12 Signature 1. Step 2- Oxygen Systems Describe operation Scoring: 10 Cover Sheet/Format/etc. 20 Questions ___________________________ 30 Total Points School of Aeronautical Science Page 12 - d