12 - Transmissions Flashcards
When a chain is removed for routine inspection, what is required regarding proof loading?
It does not need proof loading.
How is an aircraft control chain connected?
It is connected using nuts and bolts.
If a control chain can be lifted clear of a tooth, what should be done?
It should be removed and an elongation check carried out.
How should you check a chain for articulation?
Run the chain over your finger through 180° and check for smoothness and kinks.
How can you remove a tight link from a chain intended for an aircraft control system?
By applying a light tap with a hammer.
What should be done with the initial lubricant on a new chain?
It should not be removed.
How should control chains be fitted in an aircraft?
They should be fitted with the minimum of slack.
Backlash is a type of wear associated with which component?
Gears.
After cleaning a chain in paraffin, how should it be dried?
It should be dried in hot air.
What fraction of the minimum breaking load should be used as the proof load for a chain?
1/3.
If corrosion is found on a chain, what action should be taken?
Replace the chain.
What are the three principal dimensions specified for a chain?
The diameter of the rollers, the pitch, and the width between the inner plates.
What is the distance between the centres of the rollers of a chain called?
Pitch.
Which formula should be used to calculate the percentage extension of an aircraft control chain (with M = measured length under load in inches, X = number of pitches measured, and P = pitch of chain in inches)?
M – (X * P) * 100 / (X * P).
What is the maximum allowable extension of a chain assembly over its nominal length?
2%.
What does a feather key allow when locating a gear on a shaft?
It permits a positive drive and axial movement.
How is a chain removed?
By using nuts and bolts.
What is the box unit in a Teleflex control run (unsuitable for heavily loaded controls) called?
Straight lead.
How do you check a chain for elongation?
Lay it flat on a table, apply a tensile load, and measure.
