Shared Flashcard Set

Details

Fluid Lines and Fittings-DME Oral
General ASA 18 Questions
18
Aviation
Undergraduate 1
08/30/2015

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Cards

Term
What is the purpose of a sleeve on a flared tube connection?
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
Term
When should grommets be used in tubing installations?
Definition
Anytime the tubing passes through a hole in the aircraft structure
Term
What type of fluid lines are generally used in aircraft plumbing?
Definition
Metal lines and flexible hose
Term
How is metal tubing classified in size?
Definition
By outside diameter and wall thickness
Term
What are the identification markings usually found on flexible hose?
Definition

Hose size

Manufacturer

Date of manufacture

 Temperature and Pressure limits

Term
What are the identifying features on an AN fluid line fittings?
Definition
There is a shoulder between the threads and the flare cone
Term
What are the parts of a military standard flareless-tube fitting?
Definition
Body, sleeve and a nut
Term
What are the two kinds of flares generally used in aircraft plumbing systems?
Definition
Single and double flare
Term
What is the principle advantage of flexible Teflon hose?
Definition
It can be used in the same manner as rubber hose and has better operating strength and higher operating temperature range
Term
What is the difference between an AN fitting and an AC fitting?
Definition

Sleeve length

Thread pitch and AN fittings have a shoulder between the threads and the flare cone

Term
What is the purpose of a quick disconnect?
Definition
A quick means of line disconnect without loss of fluid or entrance of air
Term
What type of fittings should be used with aluminum alloy tubing?
Definition
Aluminum alloy fittings
Term
What happens to a flareless tube fitting when it is over-tightened?
Definition
The nut drives the cutting edge of the sleeve deeply into the tube, causing the tube to be weakened
Term
When fabricating a flexible hose, what percent of the total length must be allowed for freedom of movement under pressure?
Definition
5 to 8 percent
Term
How can you tell that a flexible hose has been installed in a twisted position?
Definition
By the ID stripe running along the length of the hose
Term
How is the size of a flexible hose determined?
Definition
Inside diameter in 1/16 inch increments
Term
In addition to being securely clamped in place, how should metal fuel, oil and hydraulic lines be installed in an aircraft?
Definition
They should be electrically connected by being grounded to the structure
Term
When inspecting fittings, how may a flareless fitting be distinguished from flared tube types?
Definition
There is no shoulder or flare cone between the threads and the end of the fitting
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