6.5.3 Flashcards
Where would you use quick release fasteners on the aircraft?
Used to secure inspection plates, doors and other removable panels on an aircraft.
Why would you use quick release fastener on an aircraft?
They permit quick and easy removal of access panels for inspection and servicing purposes.
They come in Dzus, Camloc and Airloc
How is the installation and removal of circlip (snap rings) achieved?
Reusable?
The removal and installation of circlips (snap rings) is with the use of special circlip pliers.
Circlips are reusable
What evaluation is done on a circlip (snap ring) after removal from a component?
Reusable?
Ensure that the retaining ring has seated correctly in its grove.
serviceable if spring is still working.
Reusuable
Can a circlip be reused?
Circlips are reusable provided their serviceability is confirmed.
What is the purpose of self aligning washers?
Reusable?
Used in special applications where the bolt is installed at an angle to the surfae or when perfect alignment with the surface is required at all times.
Reusuable
Give an example where you would use a countersink washer?
Panels or wing skins
Used when two disimilar metals are in contact with each other like aluminium and steel. Don’t want to cause corrosion so countersunk washer used.
In which type of operation are clevis pins (flathead pins) normally used?
Clevis pins (flathead pins) are used with tie-rod terminals and in secondary control, which are not subject to continuous operation.
What is a PLI washer and what is it used for?
Reusuable?
Pre-Loading indicating washers consists of concentric inner and outer rings, and two high strength steel washers.
It is used for pre-loading a bolt and is frequently used in engines.
Not-reusable (single use)
How many times can a PLI washer be used?
A PLI (Pre load indicating washer) can only be used once.
In what situations are corrosion resistant steel split pins used?
Used in locations where nonmagnetic material is required or in locations where resistance to corrosion is desired.
Describe a preferred split pin installation?
Reusable?
One leg of the splt pin is bent up over the end of the bolt, the other leg is bent down over one of the flats of the nut.
NON-reusable
Describe an optional split pin installation?
The split pin is rotated 90 degrees and the legs wrapped around the castellations.
What type of situation would taper pins be used?
Plain and threaded taper pins are used in joints which carry shear loads and no loose motion or play is allowed.
Name two recognised safety wiring methods?
Single wire method
Double twist method
Where would you use the single wire method of wire locking?
Used on small screws ina closely spaced geometrical pattern, on parts in electrical system and in placess that are extremely difficult to reach.
In the double twist method of wire locking, in general how many twists of the wire are required to an inch?
Applying not more than 7 - 10 windings per one inch length
How long is a pigtail and how many twits should be on it when wire locking?
A pigtail of 1/4 to 1/2 an inch three to six twists should be made at the end.
How are pulleys attached to rotating shafts to enable the drive element to take place?
They are attached by a key
Hollow saddle key
Flat saddle key
Woodruff key
Name three types of keys used on shafts?
Hollow Saddle key
Flat saddle key
Woodruff Key
What is a camloc fastener used for and hor would you lock it?
A Camloc fastener is a type of quick release fastener used for heavy-duty stuff.
They secure aircraft cowlings and fairings.
A quarter turn (clockwise) of the stud locks the fastener.
Are tab washers reusable?
Tab washers are not reusable.
How do you know when a PLI washer is tightened?
At the point that the outer ring can no longer be rotated the tightening is complete.
What should you do if the castellations in the nut fail to align with the driled bolt hole?
If the castellations in the nut fail to align with the drilled bolt hole, add washers under the nut until a split pin can be inserted.
