---
kind: "section"
citation: "30 C.F.R. § 57.22228"
title: "30"
number: "57.22228"
heading: "Preshift examination (I-A, I-C, II-A, III, and V-A mines)."
url: "https://uscodex.org/cfr/30/57.22228"
---

# §57.22228. Preshift examination (I-A, I-C, II-A, III, and V-A mines).

- (a) Preshift examinations shall be conducted within three hours prior to the start of the shift for which the examination is being made.
- (b) Prior to the beginning of a shift following an idle shift, a competent person shall test the mine atmosphere for methane at all work places before persons other than examiners enter the mine.
- (c) When one shift immediately follows another, a competent person shall test the mine atmosphere at each active working face for methane before work is started on that shift.
- (d) A competent person shall test the mine atmosphere at each face blasted before work is started.
- (e) Except in Subcategory I-C or Category III mines, vehicles used for transportation when examining the mine shall be approved by MSHA under the applicable requirements of 30 CFR parts [18](/cfr/30/part18.md) through [36](/cfr/30/part36.md).

## Notes

### Amendments

[52 FR 24941, July 1, 1987, as amended at 53 FR 9615, Mar. 24, 1988]

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 52 FR 24941, July 1, 1987, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.

### Amendments

[52 FR 24941, July 1, 1987, as amended at 53 FR 9615, Mar. 24, 1988]