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Aircraft Fluid Lines
General Questions for Aircraft Fluid Lines and Fittings
| Question | Answer |
|---|---|
| How do you determine what should be used as a replacement tubing in an aircraft hydraulic system? | Use the same size and material as the original. |
| When should flexible house be used for aircraft plumbing? | When connecting vibrating parts. |
| What is the main disadvantage of using copper tubing for aircraft plumbing? | Copper tubing will harden and crystalize when subject to vibration. |
| When testing a certain piece of metal tubing, you find that it is non-magnetic, and nitric acid does not affect it. What material is it? | 18-8 stainless steel |
| How is tubing that is used in aircraft plumbing identified as to its material? | Color code markings or material specification number stamp. |
| What type of aluminum alloy is used for low- and medium pressure lines? | 5052-0 or 2024-T |
| What type of tubing is used for high-pressure landing gear and brake lines? | corrosion resistant steel (stainless steel) |
| What size tubing is classified as number 8? | 8/16 or 1/2 inch outside diameter |
| What information must you have about a piece of tubing other than its outside diameter or material? | Wall Thickness |
| I a flexible house made of Buna-N recommended for phosphate ester base (Skydrol) hydraulic fluid? | No |
| Is flexible hose made of Butyl material recommended for phosphate ester base hydraulic fluid? | Yes |
| What are three characteristics of Teflon that make it a good material for flexible hoses for aircraft hydraulic installations? | 1. Broad temperature range 2. Low resistance to flow 3. Less volumetric expansion than rubber |
| What is the correct way to determine that you have the correct hose for replacement purposes? | Manufacturer's part number is the final authority |
| What color-code and color-blind symbolos are used to identify a hydraulic line? | Blue and yellow bands with bands of circles and the word hydraulics on them |
| Is the measurement of a flexible hose determined by its inside or outside diameter? | Inside |
| How are fluid lines identified in engine compartments where tape would be hazardous to use? | Paint is used instead |
| What is meant bye the marking "PHDAN" on a fluid line? | Material carried in this line is physically dangerous |
| Where should fluid line identification be placed? | At each end of the line and once in each compartment |
| Name four ways of attaching fluid lines to a component or to another line. | 1. Flared fitting 2. Flareless fitting 3. Bead and clamp 4. Swagged fitting |
| What are the distinguishing features between and AN and AC fitting? | Flare, colors, shoulder, and thread pitch are different |
| What color are aluminum alloy AN fittings? | Blue |
| What is the purpose of a quick-disconnect coupling? | Allows disconnection of lines without loss of fluid or entry of air into the line. |
| Would a piece of 3/4 inch aluminum tubing flattened in the bend to 1/2 inch be considered airworthy? | No. Minimum flattening in a bend is 75%. Minimum for this tube is 9/16 inch. |
| What procedure may be used to prevent a tube collapsing in a bend if no tubing bender is available? | Fill the tube with dry sand and plug both ends for bending |
| What two types of flares are used on aluminum tubing? | Single and double flare |
| What are the minimum and maximum limits for the size of the flare? | Minimum 1/16" beyond the end of the sleeve, maximum is no larger than the major outside diameter of the sleeve. |
| What is the advantage of a double flare over a single flare? | Smoother, more concentric, seals better, more resistant to shearing |
| What operation takes the place of forming a flare when fabricating a flareless tube fitting? | Presetting, which consists of forcing a sleeve pilot into the tubing |
| How tight should the sleeve of a flareless fitting be on the tube? | No movement of the sleeve except rotation |
| Who deep a scratch is allowed in a piece of 3/4" aluminum alloy tubing with a 0.049" wall thickness? | 0.005 (10%) |
| How deep a dent is allowable in a piece of 3/4" diameter aluminum alloy tubing with a 0.049 wall thickness? | 5/32" (20%), unless in the heel, no dent is allowed in the heel area |
| Why must every run of aircraft tubing have at least one bend? | To absorb strain on joints, expansion and contraction, and vibrations |
| Under what conditions is it permissible to pull a piece of tubing into alignment with its fittings by the use of the coupling nut? | Never |
| What is the function of the stripe (lay-line) that runs the length of a piece of flexible hose? | To indicate any twists |
| Should sealing compound be used to provide a seal with a flare type fitting? | No |
| How tight should flareless fittings be tightened with a wrench after running the nut up finger tight? | 1/6 of a turn |
| Is it propper to tighten a flareless fitting to a value beyond its recommended torque in order to stop a drip leak? | Never, it will only make it worse |
| What type of cushion clamp should be used to support a fluid line carrying Skydrol 500 hydraulic fluid? | A teflon cushion clamp |
| Should a cushion clamp on a line carrying hydraulic fluid be of the bonded or unbonded type? | Use bonded clamps for fluid lines |
| What is the flare angle for: Aircraft tubing and Automotive tubing | Aircraft 37 degrees and Automotive is 45 degrees |
| Under what conditions are double flares recommended for aircraft tubing? | For soft aluminum tubing 3/8" diameter or smaller |
| How much slack is recommended for the installation of a flexible hose in an aircraft installation? | 5 to 8 percent |
| What one characteristic of Teflon hose must be considered when working with this material? | It will take a set if exposed to high temperatures or high pressures and becomes brittle |
| How is Teflon hose checked to determine that it is not kinked excessively? | A ball of a specified size is dropped down the tube, if it is excessively twisted it will not pass through. |
Created by:
bgilbert