Term
| What is the purpose of a sleeve on a flared tube connection? |
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Definition
| The nut fits over the sleeve and when tightened draws the sleeve and tubing flare tightly against the male fitting to form the seal |
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Term
| When should grommets be used in tubing installations? |
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Definition
| Anytime the tubing passes through a hole in the aircraft structure |
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Term
| What type of fluid lines are generally used in aircraft plumbing? |
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Definition
| Metal lines and flexible hose |
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Term
| How is metal tubing classified in size? |
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Definition
| By outside diameter and wall thickness |
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Term
| What are the identification markings usually found on flexible hose? |
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Definition
Hose size
Manufacturer
Date of manufacture
Temperature and Pressure limits |
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Term
| What are the identifying features on an AN fluid line fittings? |
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Definition
| There is a shoulder between the threads and the flare cone |
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Term
| What are the parts of a military standard flareless-tube fitting? |
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Definition
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Term
| What are the two kinds of flares generally used in aircraft plumbing systems? |
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Definition
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Term
| What is the principle advantage of flexible Teflon hose? |
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Definition
| It can be used in the same manner as rubber hose and has better operating strength and higher operating temperature range |
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Term
| What is the difference between an AN fitting and an AC fitting? |
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Definition
Sleeve length
Thread pitch and AN fittings have a shoulder between the threads and the flare cone |
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Term
| What is the purpose of a quick disconnect? |
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Definition
| A quick means of line disconnect without loss of fluid or entrance of air |
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Term
| What type of fittings should be used with aluminum alloy tubing? |
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Definition
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Term
| What happens to a flareless tube fitting when it is over-tightened? |
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Definition
| The nut drives the cutting edge of the sleeve deeply into the tube, causing the tube to be weakened |
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Term
| When fabricating a flexible hose, what percent of the total length must be allowed for freedom of movement under pressure? |
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Definition
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Term
| How can you tell that a flexible hose has been installed in a twisted position? |
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Definition
| By the ID stripe running along the length of the hose |
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Term
| How is the size of a flexible hose determined? |
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Definition
| Inside diameter in 1/16 inch increments |
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Term
| In addition to being securely clamped in place, how should metal fuel, oil and hydraulic lines be installed in an aircraft? |
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Definition
| They should be electrically connected by being grounded to the structure |
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Term
| When inspecting fittings, how may a flareless fitting be distinguished from flared tube types? |
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Definition
| There is no shoulder or flare cone between the threads and the end of the fitting |
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