Pipes And Unions Flashcards
How are flexible hoses categorised?
By maximum pressure
What are the rigid pipes on gas turbine engines made from?
Stainless steel
How would you test a hydraulic hose?
Pressure test 1.5 * working pressure
To prevent damage to seals on fitment you would
Use a cardboard protector over e threaded portions
Flexible lines are identified by
Material
A pipe carrying lubricant would be identified by the colour
Yellow
Which material is a hydraulic fluid hose made from?
Teflon
Hydraulic pipes are made from
Annealed steel
The continuous coloured line on a hose assembly
Will assist in detection of any twist in an installed hose
When fitting a replacement flexible hose
Ensure adequate clearance between the hose and the aircraft structure
MIL-H-5606 hydraulic fluid O-rings are identified with a
Blue dot
A metal pipe has a small indentation. What are the limits?
No dent on a bend
An aircraft pipe has a number stamped on it. It is the
Serial number
The length of a straight hose assembly is measured
Between the extremities of the two nipples
Metal tubing fluid lines are sized by wall thickness and
Outside diameter and 1/16 inch increments
A certain amount of slack must be left in a flexible hose during installation because, when under pressure it
Contracts in length and expands in diameter
The term ‘cold flow’ is generally associated with
Rubber hose
Flexible lines must be fitted with a slack
Of 5-8% of the length
The material specifications for a certain aircraft require that a replacement oil line be fabricated from 3/4 inch, 0.072 5052-0 aluminium alloy tubing. What is the inside dimension of this tubing?
0.606 inch
Excessive stress on fluid or pneumatic metal tubing caused by expansion and contraction due to temperature changes can best be avoided by
Using short, straight sections of tubing between fixed parts or the structure of the aircraft
OR
Providing bends in the tubing
Flexible hose used in aircraft systems is classified in size according to the
Inside diameter
Which tubing have the characteristics (high strength, abrasion resistance) necessary for the use in a high pressure (3,000 PSI) hydraulic system for operation of landing gear and flaps?
Corrosion resistant steel annealed 1/4H
A gas or fluid line marked with the letters PHDAN
Is carrying a substance which may be dangerous to personnel
A 3/8 inch aircraft high pressure flexible hose compared to a 3/8 inch metal tubing used in the same system will
Have equivalent flow characteristics
How do you assemble a banjo hose?
Put washer either side of the banjo
To install a flareless coupling
Turn until torque is felt plus 2 flats
In most aircraft hydraulic systems, two-piece tube connectors consisting of a sleeve and a nut used when a tubing flare is required. The use of this type of connector eliminates
The possibility of reducing the flare thickness by wiping or ironing during the tightening process
Adaptor nipples are not required on
Pipe to externally coned adaptor
A butyl rubber seal is made from
Synthetic rubber
What is the colour of an AN steel flared-tube fitting?
Black
Which statement about military standard (MS) fitting is correct?
MS flareless fittings must be tightened to a specific torque
OR
During installation MS flareless fittings are normally tightened by turning the nut a specified amount after the sleeve and fitting sealing surface have made contact, rather than being torqued
A flexible sealing element subject to motion is a
Packing
When replacing a hydraulic pipe, where would you find the correct replacement part?
Parts catalogue
