---
kind: "section"
citation: "49 C.F.R. § 236.339"
title: "49"
number: "236.339"
heading: "Mechanical locking, maintenance requirements."
url: "https://uscodex.org/cfr/49/236.339"
---

# §236.339. Mechanical locking, maintenance requirements.


Locking and connections shall be maintained so that, when a lever or latch is mechanically locked the following will be prevented:

- (a) **Mechanical machine—**
  - (1) **Latch-operated locking.** Raising lever latch block so that bottom thereof is within three-eighths inch of top of quadrant.
  - (2) **Lever-operated locking.** Moving lever latch block more than three-eighths inch on top of quadrant.
- (b) **Electromechanical machine—**
  - (1) **Lever moving in horizontal plant.** Moving lever more than five-sixteenths inch when in normal position or more than nine-sixteenths inch when in reverse position.
  - (2) **Lever moving in arc.** Moving lever more than 5 degrees.
- (c) **Power machine—**
  - (1) **Latch-operated locking.** Raising lever latch block to that bottom thereof is within seven thirty-seconds inch of top of quadrant.
  - (2) **Lever moving in horizontal plane.** Moving lever more than five-sixteenths inch when in normal position or more than nine-sixteenths inch when in reverse position.
  - (3) **Lever moving in arc.** Moving lever more than 5 degrees.

## Notes

### Authority

Authority: 49 U.S.C. 20102-20103, 20107, 20133, 20141, 20157, 20301-20303, 20306, 20501-20505, 20701-20703, 21301-21302, 21304; 28 U.S.C. 2461 note; and 49 CFR 1.89.

### Source

Source: 33 FR 19684, Dec. 25, 1968, unless otherwise noted.