When servicing an aircraft oxygen system, why is it critical that no oil, grease, or hydrocarbon contamination contacts the components?
Safety Precautions
Question · Easy
What a Safety Data Sheet tells you
Short
An electrical fire breaks out in an avionics rack. Which extinguishing agent is most appropriate because it is electrically non-conducting and leaves no residue?
Question · Medium
Chapter 1: Safety Precautions — Electricity, Gases & Chemical Hazards
1.1 Electrical-System Hazards, Isolation & Protective Equipment
Study guide
Before working on an aircraft electrical circuit, the FIRST safety action a technician should normally take is to:
A Class B fire on an aircraft involves which of the following?
When handling solvents and chemical cleaning agents in the workshop, the primary purpose of consulting the Safety Data Sheet (SDS/MSDS) is to:
A CO2 fire extinguisher should be used with caution in a confined cockpit or cabin space primarily because:
Question · Hard
1.2 Compressed Gases, Pressure Vessels & Oxygen System Safety
Under good workshop tool-control practice, a 'shadow board' or tool-control system is used principally to:
Workshop Practices Tools
A precision tool such as a micrometer or torque wrench must be calibrated against standards that are:
A click-type torque wrench has just been used to apply a high torque value. To preserve its calibration when storing it, the technician should:
On a metric micrometer with a 0.5 mm pitch thimble and a 50-division thimble scale, one division on the thimble represents:
1.3 Hazardous Chemicals, Solvents, Oils & Personal Protective Equipment
A dial test indicator (DTI) mounted on a magnetic base is MOST appropriately used to measure:
When using a digital multimeter to measure current in a circuit, the meter must be connected:
An oscilloscope, as avionic general test equipment, is primarily used to:
A bonding tester (milliohm meter) is used to verify that the electrical bonding resistance between two airframe components is:
Chapter 2: Safety Precautions — Fire Protection, Confined Spaces & Emergency Response
2.1 Fire Classifications, Extinguishing Agents & Asphyxiation Risks
A technician needs to remove a steel bolt that has corroded into an aluminium-alloy fitting. The correct general practice is to:
In engineering drawings, first-angle and third-angle orthographic projection differ in:
Engineering Drawings Fits
The ATA Specification 100 / iSpec 2200 numbering system is used in aircraft maintenance documentation to:
A dimension on a drawing is given as 25.00 +0.05 / -0.02 mm. The maximum and minimum acceptable sizes are:
2.2 Confined-Space Entry, Fuel-Tank Safety & CDCCL Control
A shaft has a maximum size of 20.00 mm and a hole has a minimum size of 20.05 mm. The resulting fit is:
When inspecting a riveted lap joint, the minimum edge distance (centre of rivet to edge of sheet) is generally taken as not less than:
Mechanical Fasteners Assemblies
The 'pitch' of a row of rivets in a riveted joint is defined as the:
Dimpling, rather than countersinking, is used to prepare a hole for a flush rivet when:
2.3 Emergency Response, Accident Remediation & Ballistic Recovery Systems
When forming a flare on a rigid aircraft pipe for an AN/MS flared fitting, the standard flare seat angle is:
Flexible hoses in aircraft fluid systems are commonly colour-coded or banded, and rigid pipes carry coloured identification bands. The principal reason for this identification is to:
A flexible hose assembly is installed with a deliberate slight slack (it is not pulled taut between fittings) mainly to:
When crimping a terminal onto an electrical wire (EWIS) using an approved crimp tool, the tool must have a ratchet/full-cycle mechanism primarily to:
Chapter 3: Workshop Practices, Hand Tools & Precision Measurement
3.1 Workshop Housekeeping, Tool Control & Foreign Object Debris (FOD)
When stripping insulation from an aircraft wire prior to crimping, nicking or cutting the copper strands is unacceptable because it:
A wiring loom (harness) is supported by clamps/cleats at regular intervals along the structure mainly to:
When assembling a circular (e.g. MS-type) electrical connector after maintenance, the technician should ensure the coupling ring is fully mated, which is often confirmed by:
Coaxial cable used for RF/antenna feeders must be installed with care to its bend radius and connectors because excessive bending or a poor connector can:
3.2 Engineering Dimensions, Allowances & Tolerances
A helical compression spring is found to have taken a 'permanent set'. This means that the spring:
During inspection of a rolling-element (ball or roller) bearing removed from a gearbox, evidence of 'spalling' (flaking of the race or elements) indicates:
A shielded (sealed) ball bearing that is supplied pre-packed with grease and marked 'sealed for life' should normally be:
In a gear transmission, 'backlash' is checked during inspection because excessive backlash indicates:
3.3 Hand Tools, Powered Equipment & Operating Safety
A control cable end fitting is attached by 'swaging'. After swaging, the joint is typically checked with a go/no-go gauge to confirm:
When inspecting a flexible flying-control cable, 'broken wires' are counted as a rejection criterion. A common allowable limit is expressed as the maximum number of broken wires:
When marking out and bending sheet metal, the 'bend allowance' is calculated to determine the:
Aluminium-alloy sheet for aircraft structure (e.g. clad 2024-T3) is bent across the grain where possible because bending along the grain:
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