will 173.29(a) put my truck out of service
No. Across our 13 million inspection records, none of the 3 all-time citations for 173.29(a) resulted in an out-of-service placement, giving this violation a 0.0% OOS rate. This is substantially better than the 31.4% national average OOS rate across all FMCSR codes. You will not be ordered off the road for this citation alone.