**Aircraft Life Support Systems**

Question 1

You should NEVER _______ to aircraft systems during oxygen system maintenance, and a ______ will be present.

Answer 1

apply power, safety observer

Question 2

ALWAYS wear _______ while performing oxygen system maintenance.

Answer 2

Eye protection

Question 3

Tools used for oxygen maintenance will be marked _____ and must be non-sparking, made of _____.

Answer 3

Oxygen Use Only, brass.

Question 4

Tools must be kept free of grease, oil, and other ______.

Answer 4

Hydrocarbons

Question 5

Cylinders can become a missile hazard if it falls and the valve breaks off. Name safety precautions that will be adhered to when handling high pressure storage cylinders:

Answer 5

Never store in upright position unless in storage rack. Never move any oxygen cylinder without protective cap installed over valve. Never attempt to lift a cylinder by yourself, two people should always be used. Never store oxygen cylinders near hydrocarbons or flammables. Never store oxygen cylinders where the temp exceeds 125*F. Never allow cylinders to be depleted below 50psi because that can allow moisture or contaminates to accumulate before it’s refilled.

Question 6

What oxygen will be used in aircraft oxygen systems?

Answer 6

MIL-PRF-27210 Type 1, Aviator’s Breathing Oxygen

Question 7

How are Aviator’s Breathing Oxygen cylinders identified?

Answer 7

Painted green with a three-inch wide white band at the upper end. The words “OXYGEN AVIATORS” are stenciled in white

Question 8

How is Aircraft oxygen line tubing identified?

Answer 8

Tape containing the words, “BREATHING OXYGEN” on a green field with black rectangles on the right hand border.

Question 9

Persons not directly involved in oxygen servicing operations shall stay outside a ___ft radius, this is called the ________.

Answer 9

20 ft, oxygen servicing safety zone

Question 10

Oxygen servicing equipment will be kept at the following minimum distances: ____ from structures with fire resistant or non-combustible exterior walls or automatic fire extinguishing systems. ____ from combustible structure, areas where equipment is in operation, sources of ignition, or smoking areas. _____ from aircraft parking, fueling, or defueling areas

Answer 10

25ft, 50ft, 75ft

Question 11

Oxygen is carried onboard pressurized aircraft in the event of ____________ or if the cabin becomes contaminated with _________; intended to supply oxygen to the crew and passengers via masks.

Answer 11

Loss of pressurization, smoke or fumes

Question 12

What are the two oxygen systems used on aircraft, based on the type of oxygen?

Answer 12

Gaseous Oxygen System and Liquid Oxygen System (LOX)

Question 13

How are both types of oxygen stored?

Answer 13

Gaseous oxygen is stored in large steel cylinders, while LOX is stored and converted into a usable gas in a liquid oxygen converter.

Question 14

What type of system does the HC-130J utilize?

Answer 14

A liquid oxygen-supplied breathing system.

Question 15

What are the two types of regulators used to dispense the oxygen?

Answer 15

Continuous Flow Oxygen System and Pressure Demand Oxygen System

Question 16

A continuous flow oxygen system delivers oxygen how?

Answer 16

Even when the mask is not in use or the user is exhaling, a preset flow of oxygen continues until the tank valve is closed.

Question 17

A Pressure Demand Oxygen System delivers oxygen how?

Answer 17

Only as the user inhales or on demand. This causes duration of oxygen supply is extended.

Question 18

Gaseous oxygen is stored and transported in the high-pressure cylinders which are certified to _______ specifications, and bottles are considered empty when the pressure drops below ___psi.

Answer 18

Department of Transportation, 50

Question 19

A full face quick-donning oxygen mask is used on what aircraft, and how quickly can they be donned?

Answer 19

HC-144, less than 5 seconds

Question 20

A quick-donning oxygen mask (not full face) is used on what aircraft?

Answer 20

HC-130

Question 21

What are the two types of regulators used in oxygen systems? Briefly describe both.

Answer 21

Diluted Demand type regulator- holds back the flow of oxygen until the user inhales with a demand type oxygen mask. Pressure-demand type regulator- force oxygen into the lungs of the user when the demand valve is unseated.

Question 22

What regulators are used above 40,000ft and what regulators are used below 40,000ft?

Answer 22

Diluter- below 40,000. Pressure- Above 40,000.