KONGSBERG HMS 300 Helicopter Deck Monitoring System

Maintenance and troubleshooting

1. Regular maintenance

Maintenance project cycle description

The air filter of the processor unit should be cleaned at least every 6 months to prevent overheating

Meteorological sensor PTU module replacement every 3 years to ensure temperature and humidity measurement accuracy

MRU H/E/5 and MGC R2 calibration compensate for sensor characteristic drift every 5 years

MRU 5+and MGC R3 calibration compensate for sensor characteristic drift every 10 years

MRU 3 calibration compensates for sensor characteristic drift every 2 years

2. Common troubleshooting

Possible causes and solutions for the fault phenomenon

No power supply, poor power connection or blown fuse. Check the power connection and the fuse inside the power connector of the processor unit

Mouse idle without cursor timeout. Move the mouse to restore display

No wind information. The wind speed sensor is not outputting true wind data. Restart the system to enable relative wind data

IMU data invalid communication interruption or IMU fault inspection port monitor, cable connection, junction box fuse, shielding layer grounding

3. Return to factory for repair

The internal components of IMU (MRU or MGC) are precise and users are not allowed to disassemble them on their own. When calibration is required, the sensor body (excluding the installation bracket) should be returned to Kangshibo for repair or calibration using the original factory transport box. Before repairing, please contact customer support to obtain an RMA number.

Principles and definitions of computation

1. Significant heave rate

The significant heave rate is the average amplitude of the highest one-third heave rate in the past 20 minutes, calculated according to ATKINS Technical Specification No. 5077366-000-TN-1.

2. Maximum average heave rate

The system supports two calculation methods:

Norwegian method 1: Vavg=Hmax/(Tmax/2), where Hmax is the maximum total heave and Tmax is the corresponding heave cycle

Norwegian Method 4: Calculate the slope between each peak and valley using the actual time difference

Method 4 is more conservative and secure, and is the default setting of the system.

3. Tilt angle

The formula for calculating the maximum deck tilt angle is:

MaxInclination

=arccos(cos(MaxRoll)×cos(MaxPitch))

MaxInclination=arccos(cos(MaxRoll)×cos(MaxPitch))

4. Wind speed statistics

2-minute statistics: Output the maximum value that is more than 10 knots higher than the 2-minute average

10 minute statistics: Output the maximum value that exceeds the 10 minute average by more than 10 segments and lasts for more than 3 seconds

5. Deck report output variables

Maximum roll

Maximum pitch

Maximum tilt

Maximum uplift and subsidence

Maximum average heave rate

Significant heave rate

Product Limitations and Precautions

1. Export restrictions

The export of MRU and MGC products must comply with the export control regulations of the Norwegian Ministry of Foreign Affairs and the US Export Administration Regulations, and may be subject to re export restrictions in the destination country.

2. Usage restrictions

The system is only used for ships with linear acceleration less than ± 30 m/s ² (± 3 g) and angular velocity less than ± 75 °/s

Relative dynamic heave measurement is limited to a motion cycle range of 1 to 25 seconds

The system, as an auxiliary tool for helicopter takeoff and landing, shall not be used as the sole navigation basis for helicopter operations

3. Network security

The system does not have antivirus or network security software installed. When connecting to external networks, the end user needs to develop their own security policies and take corresponding protective measures.