In the October 2020 edition of ‘Offshore Helicopters Recommended Practices’ the IOGP moved to recommend both Helicopter Flight Data Monitoring and Health and Usage Monitoring for all helicopters operating offshore.
See full details in section 690-5 ‘Helicopter and Equipment.’ Section 8 details the HFDM requirements and Section 9 does the same for HUMS. Noting the purpose of the requirement as “Ensuring the early detection of impending critical failures to facilitate timely corrective action,” the report goes on to specify system requirements:
Health and Usage Monitoring System (HUMS)
9C.1 The HUMS monitor vibration data of the following, using a combination of spectrum analysis and advanced diagnostic (proprietary signal processing) techniques.
9C.2 It includes a diagnostic capability for every dynamic component in the drive train:
9C.2.1 Engine to main gearbox input drive shafts
9C.2.2 Main gearbox shafts, gears, and bearings
9C.2.3 Accessory gears, shafts, and bearings
9C.2.4 Tail rotor drive shafts and hanger bearings
9C.2.5 Intermediate and tail gearbox gears, shafts, and bearings
9C.2.6 Main and tail rotor track and balance
9C.2.7 Engine health
GPMS’s Foresight MX integrates both HFDM and HUMS.
For more details see https://www.iogp.org/bookstore/product/690/