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Service bulletin 21506

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10200827
Published by NHTSA2021-09-02
Manufacturer's number21506
Manufacturer's date2021-08-06
NHTSA componentSTRUCTURE

NHTSA's summary

Certain school buses may not conform to Federal Motor Vehicle Safety Standard (FMVSS) 217 – the exit opening configuration may not meet the minimum exit opening criteria.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Body and frame

Vehicles listed
IC BUS CASB2014
IC BUS CESB2019
IC BUS CESB2022

Listing a model year does not mean every vehicle of it is concerned: the document says which.