30 Questions
What is the tolerance of a dimension given as a common fraction in an aircraft drawing?
±1/64 in.
What is the difference between the nominal dimension of a part and its upper or lower limit called?
Allowance
What is the acceptable range of size for a precision cylindrical part?
The range between the upper and lower limits of size
How is the tolerance of a dimension expressed?
As the difference between the upper and lower limits of size
What is the relationship between the tolerance and the upper and lower limits of size?
The tolerance is the difference between the upper and lower limits of size
Why is the acceptable range of size usually smaller for mating cylindrical parts than for sheet metal repairs?
Because mating cylindrical parts require a smaller tolerance
What is the primary purpose of a shadow board in aviation maintenance?
To provide visual feedback on tool location and status
What is the benefit of using color-coding on shadow boards and tools?
It makes it easier to identify misplaced tools
Why do some maintenance organisations require employees to permanently mark their tools?
To ensure tool accountability and identification
What is the advantage of posting shadow boards in plain sight of all tool users?
It provides immediate feedback on tool status
What information does a shadow board typically convey?
Tool location and availability status
What is the result of using shadow boards in aviation maintenance?
Elimination of the need to search through toolboxes
What is the prescribed difference between the maximum material limits of mating parts?
Allowance
What is the maximum material limit of a part?
The limit of size that provides the maximum amount of material
What is the result when the maximum diameter of the bolt is 0.001 in.less than the minimum diameter of the hole?
Minimum clearance
What is essential for engineers and technicians when using measuring tools?
They must use the tools correctly and efficiently.
What is the result when the maximum diameter of the bolt is 0.001 in.greater than the minimum diameter of the hole?
Maximum interference
What information should be included on the label for precision tooling and equipment?
The date last tested, the next inspection or calibration date, and the authorised person's signature or stamp
How often should inspections and calibrations of precision tooling and equipment be conducted?
At more frequent intervals than the manufacturers' instructions.
What is necessary to check before using a precision measuring tool?
The tool's calibration tag and that it will 'zero' correctly.
Why is regular inspection and calibration of precision tooling and equipment necessary?
To ensure the tools are within the inspection or calibration period
What is a requirement for using personally owned measuring tools in the regulated civil aviation industry?
The tool must be approved by the aircraft operator or MRO organisation.
What is the purpose of maintaining a register for precision tooling and equipment?
To record the calibrations and standards used.
What should be done periodically with torque wrenches?
They should be checked for accuracy – calibration.
What is the recommended procedure for disposing of mixed two-pack sealants?
Cure them completely before disposing according to local regulations
How are most aircraft drawings dimensioned?
From a reference edge from which all dimensions are made
What is the conventional method for placing dimensions on an aircraft drawing?
Writing all dimensions parallel to the bottom of the drawing
What is the nominal dimension of an aircraft part?
The size stated on the drawing
What is the tolerance of an aircraft part?
The difference between the nominal dimension and the upper and lower limits of size
What symbol represents inches in drawings and dimensional specifications?
″
Learn how shadow boards are being used in aviation organizations to improve tool management and efficiency. Discover the benefits of visual indicators in reducing search time and increasing productivity.
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