Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
What are aircraft plumbing lines usually made of? |
Metal tubing and fittings, or flexible hose. |
|
|
How is metal tubing sized? |
By outside diameter, which is measured fractionally in sixteenths of an inch, and by wall thickness |
|
|
What precautions should be taken when routing fluid lines adjacent to electrical wiring? |
Rotate the fluid lines below the electrical wiring and maintain a clearance of at least six inches whenever possible. In no case should fluid lines and electrical wiring be closer than one-half inch. Ensure that both the wiring and the fluid lines are fastened to the aircraft structure by clamps or other methods that will maintain the separation. |
|
|
What is the purpose of the identification stripe running along the length of a flexible hose? |
The stripe is used to determine if the hose has twisted during installation. The stripe should not spiral around the hose after installation is completed. |
|
|
How are standard AN-type fluid line fittings identified? |
AN-fluid line fittings are colored either blue or black while AC-type fittings are usually gray or yellow. AN fittings have coarser threads than AC fittings, and they also have a small shoulder between the threads and the flare cone. The AC fittings are completely threaded from the shoulder all the way to the flare cone. |
|
|
What is the purpose of using quick disconnect couplings in fluid systems? |
Quick disconnect couplings are installed at locations where frequent uncoupling of the lines is required for inspection maintenance. Each half has a valve that is open when coupled together and spring-loaded closed when disconnected. They provide a means of quickly disconnecting a line without a loss of fluid or air entering the system. |
|
|
How is flexible hose sized? |
By the inside diameter in sixteenths of an inch increments. |
|
|
How much slack must be left in a flexible hose during installation? |
Five to eight percent of the total hose length must be allowed for freedom of movement under pressure. |
|
|
What are the three parts of a Military Standard (MS) flareless tube fitting? |
The body, the sleeve, and a nut. |
|
|
What will be the result of over tightening a flareless tube fitting? |
The sleeve's cutting edge will cut too deeply into the tube and cause the tube to be weakened. |
|
|
What are the two kinds of flares used in aircraft plumbing systems? |
A single flare and a double flare. |
|
|
What is the advantage of flexible Teflon hose over rubber hose? |
It can be used in the same manner as robber hose, but it has a better operating strength. |
|
|
What precaution should be taken when deburring the cut end of a tube? |
Care should be taken that the tubing is not cracked or that the wall thickness is not reduced by the deburring process. |
|
|
What type of tube is used in high pressure hydraulic systems? |
Corrosion resistant steel; either annealed or 1/4" hard. |
