Torque Tools

Question 1

State the purpose of a Torque Tool?

Answer 1

A Torque Tool is used to apply a specific torque to a fastener such as a nut or a bolt.

Question 2

State the three types of Torque Tools?

Answer 2

• Torque Wrench.
• Torque Handle.
• Torque Driver.

Question 3

Explain how a Type I Torque Tool indicates the torque exerted?

Answer 3

Indicating Type - Indicates by means of a mechanical scale. Dial or electronic display, the value of torque exerted by the tool at the output drive.

Question 4

Explain how a Type II Torque Tool indicates the torque exerted?

Answer 4

Setting Torque Tools - pre-set to a certain torque value so that when the prescribed value of torque is exerted by the tool at the output drive, a signal is released (audibly, visibly or perceptibly).

Question 5

Explain how a Deflecting Beam torque tool signals the required torque has been reached?

Answer 5

Collapse at a point along the external length of the tool

The large angle of the handle break avoids over-torque.

Question 6

What checks are required on a Torque Tool?

Answer 6

• Pre-Use
• After Use
• 12 Monthly Calibration
• Whenever accuracy is in doubt

Question 7

How often should a Torque Tool be calibrated?

Answer 7

Every 12 Months

Question 8

Explain how a Pre-Use check is conducted on a Type II torque tool?

Answer 8

All Torque Tools are to be calibrated every 12 months.

Torque Tools are to be calibrated with the use of Torque Analyser.

Each tool is to be tested at 20%, 60% and 100% of the tool’s capacity.

Each test consists of 5 repetitions at each percentage.

Class C and F require 10 repetitions during testing.

Tool must be within the “Maximum Permissible Deviation” parameters on every test.

Each class of Torque Tool has varying deviation scales.

Question 9

At which percentage capacities is a Type II torque tool to be calibrated at?

Answer 9

• 20%
• 60%
• 100%

Question 10

Within which AP can the results sheet for Torque Tool calibration be found?

Answer 10

AP119G-0128-1

Question 11

Which MOD Form should be attached to a Serviceable Torque Tool if placed in transit?

Answer 11

MOD F731

Question 12

What MOD Form should be affixed to a Serviceable Torque Tool?

Answer 12

MOD F1777 A/B/C

Question 13

State two good practices for the use of Torque Tools?

Answer 13

• Never over-adjust the wrench, handle or driver by exceeding the maximum capacity.
• Do not use setting-type torque tools to undo fasteners. Indicating types with left hand torque capability may be used for undoing fasteners up to their maximum reading capacity.
• Check the accuracy of the tool at the prescribed intervals.
• Do not store adjustable setting type torque tools with the mechanism set above the range minimum value.

Question 14

When conducting torque checks on self-locking fasteners, how should the procedure be conducted?

Answer 14

• The method for checking the torque load of a fastener will normally be specified in the relevant Maintenance Manual or General Orders applicable to a particular type of equipment. Where no specific instruction applies the preferred method is to loosen the fastener by one turn and then retighten to the specified torque.
• Where a fastener incorporates a self-locking device the integrity of the self-locking medium is likely to be compromised by regular intentional loosening (e.g. Nyloc nuts). Unless otherwise specified, this type of fastener should not be slackened prior to checking the torque load.