MSG-3: Operator/Manufacturer Scheduled Maintenance Development, VOLUME 2 - ROTORCRAFT, Revision 2022.1

Description

The ATA MSG-3 publication outlines a decision-logic process for determining initial scheduled maintenance requirements for new rotorcraft and/or power plants.  This document presents a means for developing maintenance tasks and intervals acceptable to regulatory authorities, operators and manufacturers.

The changes and IMRBPB approved Issue Papers (IPs) introduced in 2022 are:

• Updated the definition of “Operating” to align it to ICAO definition of “Operation of an aircraft” (IP 186)
• Clarified that tasks selected through EZAP to reduce the likelihood of accumulation of combustible materials is only for zone containing EWIS (IP 189)
• Clarified that Failure Causes should describe specifically why and how a function fails (IP 190)
• Provided guidance on need to consider in the SSI selection any structure that, if failed or detached in flight could, through secondary damage, compromise continued safe flight and landing (IP 192)
• Provided guidance on the need to provide detailed information about how much deterioration of an   LHSI / L/HIRF protection component is acceptable and how it can be detected (IP 193)
• Clarified that “Sampling” is not only applicable to “Systems/Powerplant” (IP 194)
• Removed duplicated information from paragraph [2-3-7] (IP 195)
• Adjusted the Zonal procedure scope to adequately address “Other Structure” (IP 196)
• Provided guidelines to take into account non-chemical causes such as disbonding and/or delamination resulting from water ingress in combination with freeze/thaw cycles (IP 198)
• Provided guidance on the management of AFM Assumptions (IP 201)
• Added supplementary factors to be considered in the definition of the CPCP task (IP 202)
• Removed the references to the CCMR/CMCC process from paragraph [2-3-8] (IP 204)

Notes