30 CFR § 77.309 - Visual check of system equipment.
---
identifier: "/us/cfr/t30/s77.309"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 77.309 - Visual check of system equipment."
title_number: 30
title_name: "Mineral Resources"
section_number: "77.309"
section_name: "Visual check of system equipment."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "O"
subchapter_name: "COAL MINE SAFETY AND HEALTH"
part_number: "77"
part_name: "MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 811."
regulatory_source: "36 FR 9364, May 22, 1971, unless otherwise noted."
cfr_part: "77"
---
# 77.309 Visual check of system equipment.
Frequent visual checks shall be made by the operator of the thermal dryer system control station, or by some other competent person, of the bypass dampers, air-tempering louvers, discharge mechanism, and other dryer system equipment.