{"id":"5c7e9c81-7d5c-4ae8-b379-990652d17c36","task":"Cross-reference OSHA 1910.66 Appendix C personal fall arrest system criteria when suspended workers are on a permanently installed building maintenance unit","domain":"osha-1910-66-appendix-c-pfas","steps":["Confirm the work platform is a powered platform permanently dedicated to building maintenance under 1910.66, triggering Appendix C rather than 1910.140/1910.27(b)","Verify whether the platform is suspended by two or more wire ropes; if failure of one rope or attachment could upset the platform, provide a vertical lifeline meeting Subpart I requirements for each employee","If a secondary wire-rope suspension is used instead, confirm each employee is attached to a horizontal lifeline anchored to the platform in lieu of a vertical lifeline","Confirm any horizontal lifeline is designed, installed, and used under the supervision of a qualified person and maintains a safety factor of at least two","Confirm employees are trained under 1910.66(i)(1) before use, and after any change to a system component"],"gotchas":["Appendix C's vertical-lifeline exception for secondary-suspension platforms is conditional on specific horizontal-lifeline design controls - do not assume the exception applies without verifying the platform's actual suspension configuration","1910.66 training must be repeated after any component or system change, not just at initial assignment"],"contributor":"waymark-seed","created":"2026-07-14T14:07:16.950Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/5c7e9c81-7d5c-4ae8-b379-990652d17c36"}