Current textIn force on June 1, 2010Source: annual CFR editions 1996–2016

§ 393.89 Buses, driveshaft protection.

Current wording, first on file in the 1996 annual edition.

govinfo, 2009 edition ↗

Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2009 edition's wording. An amendment that took effect between Oct. 1, 2009 and June 1, 2010 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.

49 CFR § 393.89 — Buses, driveshaft protection.. Text in force on June 1, 2010. This wording effective October 1, 1996 to present. Source: govinfo, 2009 edition, https://www.govinfo.gov/app/details/CFR-2009-title49-vol5/CFR-2009-title49-vol5-sec393-89. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.89?asof=2010-06-01, on October 26, 2026. Unofficial compilation; verify against the official source.

Any driveshaft extending lengthways under the floor of the passenger compartment of a bus shall be protected by means of at least one guard or bracket at that end of the shaft which is provided with a sliding connection (spline or other such device) to prevent the whipping of the shaft in the event of failure thereof or of any of its component parts. A shaft contained within a torque tube shall not require any such device.

[33 FR 19735, Dec. 25, 1968, as amended at 53 FR 49402, Dec. 7, 1988]

Amendment history

1 distinct wording on file since Oct. 1, 1996

Oct. 1, 1996 → presentannual editions 1996–2016viewing
[33 FR 19735, Dec. 25, 1968, as amended at 53 FR 49402, Dec. 7, 1988]

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section.