Questions and Answers
What is the primary purpose of locking devices in aircraft?
Which type of self-locking nut is constructed without the need for additional safetying means?
What is the function of plain washers in aircraft repair?
What is the characteristic feature of shakeproof lock washers?
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Which of the following is NOT a type of fastener mentioned for aircraft panel access?
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In what scenario would special washers be necessary during an aircraft repair?
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What distinguishes split pins from other locking methods?
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Why is it important to use plain washers under lock washers?
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What is necessary to ensure safe movement of an aircraft on the ground?
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Which individuals are essential for the movement of an aircraft?
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Which precaution is NOT required for safe aircraft ground running?
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What is the minimum requirement for personnel during aircraft towing?
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What should be ensured regarding rotors or propellers during aircraft ground operations?
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What is a critical consideration before moving an aircraft?
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Which is a necessary requirement when preparing for aircraft ground running?
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When should wheel chocks be available during aircraft operation?
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Why is water ineffective for extinguishing certain types of fires?
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Which extinguishing agent is effective against combustion because it displaces oxygen?
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What is a disadvantage of using dry chemical extinguishers?
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Which extinguishing agent is no longer approved due to its toxicity and potential to produce poisonous gas?
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What requirement must portable fire extinguishers meet in aircraft crew and passenger compartments?
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Why might methyl bromide (Halon 1001) not be used in aircraft?
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What is the consequence of using soda acid extinguishers in certain situations?
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Which fire extinguishing agent chemically reacts with flames to extinguish fires?
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What is the primary purpose of housekeeping fire prevention methods in aircraft maintenance areas?
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When cleaning up flammable liquid spills in aircraft environments, what is the recommended action?
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Why must oil and greases not be used on oxygen equipment in aircraft?
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What is essential to observe when working near aircraft to prevent fire hazards?
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What should be done with rags that are impregnated with flammable fluids?
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Before commencing work on an aircraft, what should a technician always consult?
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How are fire extinguishers generally activated in aircraft maintenance areas?
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What must be strictly followed regarding oxygen systems in aircraft?
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What is the primary reason for using a shadow board for handtools?
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Which type of spanner is recommended to reduce slippage when tightening nuts or bolts?
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What should be done with punches that have mushroom heads?
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What must be ensured before using powered tools?
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When using pliers to clip wire, what is the correct practice for deflection of the wire?
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What is an essential feature of screwdrivers used for electrical work?
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Which of the following practices is advised for using hammers?
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What is the best practice when using a spanner to tighten a bolt or nut?
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Study Notes
Locking Devices
- Locking devices prevent nuts and bolts from loosening due to vibrations in aircraft.
- Common locking methods include split pins, lock nuts, and wire-locking.
Self-Locking Nuts
- Self-locking nuts integrate safety features within their construction.
- Two types: all-metal and fibre-lock nuts require no additional safetying mechanisms.
Aircraft Washers
- Types: plain, lock, and special washers are used in aircraft repair.
- Plain washers act as shims and protect surfaces under lock washers.
- Lock washers use spring action to prevent nut loosening from vibration.
- Shakeproof lock washers feature tabs for securing nuts and bolts.
- Special washers are designed for bolts installed at angles or for alignment purposes.
Turn Lock Fasteners
- Known as quick-release or quick-action fasteners, facilitating easy access for inspections.
- Common types: Dzus, Camloc, and Airloc fasteners.
Split Pins (Cotter Pins)
- Used with castellated nuts designed for drilled bolts.
- Split pins must fit snugly in holes and are single-use.
- Rotor systems generally have specific locking procedures outlined in manufacturer manuals.
Movement of Aircraft
- Aircraft can be ground-handled or towed for servicing or flight.
- Locking devices must be in place according to manufacturer manuals.
- Wheel chocks should be available in case of brake failures.
- A minimum ground crew includes a qualified driver, cockpit operator, and wing-tips watchers.
Aircraft Ground Running
- Only qualified personnel may perform ground running of aircraft.
- Ground procedure manuals should guide practices and precautions.
General Precautions
- Ensure aircraft are on firm ground, free from foreign object debris (FOD).
- Ground support equipment must be away from the aircraft.
- Aircraft should face into the wind for optimal airflow.
- Main wheels must be chocked with the parking brake engaged.
- Warning against water on metal fires; alternative methods: CO, HALON, dry chemicals.
Aircraft Fire Extinguishers
- Built-in detection and extinguishing systems meet FAA, CAA, and DCA regulations.
- Portable extinguishers must be type-approved, suitable for specific fire risks, and minimize toxic hazards.
Extinguishing Agents Not Recommended
- Dry chemical extinguishers: Effective but leave residue harmful to visibility and equipment.
- Carbon tetrachloride (Halon 104): Toxic and no longer approved due to gas toxicity when heated.
- Soda acid and foam extenders can be both toxic and corrosive.
- Methyl bromide (Halon 1001): Highly toxic and corrosive to several metals.
- Chlorobromomethane (Halon 1011): Effective but also toxic.
Fire Fighting Appliances
- Local firefighting equipment requires knowledge of extinguisher locations and emergency exits.
- Fire prevention through efficient servicing and prompt first aid firefighting equipment use.
Aircraft Fire Hazards
- Flammable liquids such as fuels and hydraulic oils need immediate cleanup upon spillage.
- Extra precautions during defueling due to high fire risk.
Oxygen Systems
- High-pressure cylinders store oxygen and must be leak-free to prevent fire escalation.
- Oil and grease must never contact oxygen equipment.
Cleaning Materials
- Avoid accumulation of waste fluids; use closed metal containers for contaminated rags.
Naked Lights and Heat Sources
- Avoid naked flames and unsealed light sources around aircraft.
- Smoking prohibited near aircraft, hangers, and fuel zones.
Aircraft Fire Extinguishing Procedure
- Always refer to aircraft manuals before commencing work to ensure adherence to firefighting procedures.
Hand Tools
- Tools should be organized and easily checked using shadow boards.
- Strict rules for the use of hammers, screwdrivers, punches, and spanners to prevent accidents.
Powered Tools
- Ensure all safety guards are in place before use.
- Protective clothing is essential to avoid contact with moving parts.
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Description
This quiz explores various locking devices used in aircraft to prevent nuts and bolts from loosening due to vibrations. It covers methods such as split pins, lock nuts, wire-locking, and the role of self-locking nuts in ensuring safety. Test your knowledge on these crucial components of aircraft maintenance!