18 Questions
What is a common danger area around an engine?
Pneumatic starter's plane of rotation
Why are ADF maintenance personnel generally not authorized to perform engine runs on rotary wing aircraft?
Due to the risk of aircraft lift-off
What unique operating hazards do helicopters present?
Jet exhaust effects
What is a significant danger during night-time operation of propeller-driven aircraft?
Strobe effect of anti-collision and warning lights
When can some ADF maintenance personnel perform engine runs on specific helicopter types?
When power-trains can be isolated from the engine
Which part of an engine around which dangers exist is mentioned in the text?
Engine's turbine plane of rotation
What is the main danger area associated with helicopter engines?
Engine intake
Which component of the helicopter spins at higher speeds than the main rotor assembly?
Tail rotor
What can cause main rotor disc droop in a helicopter?
Blade weight overcoming centrifugal force
Why is it challenging to determine if a tail rotor is operating in certain lighting conditions?
Night or strobe light operation
What danger is associated with engine intake in helicopters?
Intake of maintenance equipment and personnel
Which part of a helicopter can easily skid around the main rotor axis causing unexpected movement?
Tail rotor
Why is it dangerous to perform maintenance or operate around helicopters?
High noise levels that can interrupt activities
What precaution should be taken when performing maintenance near engine intake areas?
Be cautious of high temperatures and exhaust efflux
What can be a potential hazard to those near engine exhaust areas?
High exhaust gas velocity
Why is it important to understand the danger areas shown in this figure?
To mitigate risks during maintenance or operation around helicopters
What effect does noise from gas turbine engines have on maintenance and flight line activities?
It can interfere and interrupt these activities
Why is hearing protection mandatory in circumstances involving gas turbine engines?
To protect against high noise levels
Study Notes
Maintenance Hazards
- Caution must be exercised when performing maintenance around engine intake areas due to high temperatures and exhaust efflux.
- Exhaust gas velocity from turboshaft engines is negligible compared to turbojet exhaust nozzle velocity.
Danger Areas around Helicopters
- Intake and exhaust areas are hazardous, as shown in Figures 2 and 3.
- Noise levels from gas turbine engines can be dangerous to humans, requiring hearing and organ protection.
- Additional risks exist from turbine plane of rotation and pneumatic starter's plane of rotation.
- Turbopropeller aircraft have an additional risk from the propeller.
Rotary Wing Danger Areas
- Helicopters present unique operating hazards, regardless of who operates the aircraft.
- ADF maintenance personnel are generally not authorised to perform engine runs on rotary wing aircraft due to the risk of aircraft lift-off.
- Some exceptions exist on specific helicopter types where power-trains can be isolated from the engine.
Engine and Propulsion Hazards
- Helicopters have engine and propulsion danger areas, including:
- Main rotor disc
- Tail rotor (if single main rotor)
- Engine intake
- Engine exhaust
- Caution must be exercised when moving around helicopters, particularly during start-up and shut-down.
- Tail rotors spin at higher speeds than main rotor assemblies, making it difficult to determine if the rotor is operating in certain lighting conditions.
- Helicopters with skid landing gear can skid around the main rotor axis, causing the tail rotor plane of rotation to advance forward unexpectedly.
- Engine intake can ingest maintenance equipment and personnel.
Test your knowledge on the safety precautions that must be taken when performing maintenance around helicopter engine intake areas. Learn about the dangers posed by high temperatures and exhaust efflux. Reference figures and specifications from the Defence Aeroskills Training Academy manual.
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