What action is required if a rotor exceeds 64% mast moment for an extended duration?

What action is required if a rotor exceeds 64% mast moment for an extended duration?

• A. Immediate engine cut-off
• B. Maintenance action after 25 seconds cumulative
• C. Automatic system reset
• D. Manual inspection every flight

Answer: (B)

When a rotor exceeds 64% mast moment for an extended duration, it is necessary to perform maintenance action after 25 seconds of cumulative exceedance. This requirement is in place to ensure the safety and integrity of the lifting system. Excessive mast moment can indicate that the rotor system is under significant stress, which can lead to structural failures or operational issues if not addressed promptly. Taking maintenance action helps in identifying any potential damage or wear on the rotor components that could compromise safety. Monitoring cumulative time helps establish a threshold for the point at which this maintenance is necessary, thus providing a systematic approach to managing the stresses experienced by the rotor system during operation. This preventive measure reflects a commitment to operational safety and the integrity of the lifting equipment. Other options, such as immediate engine cut-off, may not be appropriate as they could disrupt the operation without necessary monitoring. An automatic system reset could potentially mask issues rather than addressing them, and manual inspections every flight might not be timely enough if the exceedance continues for the specified duration. Therefore, the requirement of performing maintenance action after a set period is the correct and most effective response to managing the risk associated with exceeding the mast moment threshold.

When a rotor exceeds 64% mast moment for an extended duration, it is necessary to perform maintenance action after 25 seconds of cumulative exceedance. This requirement is in place to ensure the safety and integrity of the lifting system. Excessive mast moment can indicate that the rotor system is under significant stress, which can lead to structural failures or operational issues if not addressed promptly.

Taking maintenance action helps in identifying any potential damage or wear on the rotor components that could compromise safety. Monitoring cumulative time helps establish a threshold for the point at which this maintenance is necessary, thus providing a systematic approach to managing the stresses experienced by the rotor system during operation. This preventive measure reflects a commitment to operational safety and the integrity of the lifting equipment.

Other options, such as immediate engine cut-off, may not be appropriate as they could disrupt the operation without necessary monitoring. An automatic system reset could potentially mask issues rather than addressing them, and manual inspections every flight might not be timely enough if the exceedance continues for the specified duration. Therefore, the requirement of performing maintenance action after a set period is the correct and most effective response to managing the risk associated with exceeding the mast moment threshold.