American Transportation Corporation Download PDF Report
The American Transportation Corporation submitted a model International® RE Commercial, diesel powered 39 seat/40-foot bus, for a 10-year/350,000 mile STURAA test. The odometer reading at the time of delivery was 1,218.0 miles. Testing started on May 15, 2000, and was completed on October 23, 2000. The Check-In Section of the report provides a description of the bus and specifies its major components.
The primary part of the test program is the Structural Durability Test, which also provides the information for the Maintainability and Reliability results. The Structural Durability Test started on May 26, 2000 and was completed on October 7, 2000.
The interior of the bus is configured with seating for 39 passengers including the driver. Free floor space will accommodate 44 standing passengers resulting in a potential load of 83 persons. At 150 lbs per person, this load results in a total vehicle weight of 32,800 lbs. The first segment of the Structural Durability Test was performed with the bus loaded to a GVW of 32,800 lbs. The middle segment was performed at a SLW of 28,600 lbs and the final CW segment was performed at 22,700 lbs. Durability driving resulted in several failures that required unscheduled maintenance. A description of failures, and a complete and detailed listing of scheduled and unscheduled maintenance, is provided in the Maintainability Section of this report.
The components covered in Section 1.3 (Repair and/or Replacement of Selected Subsystems) along with all other components encountered during testing were found to be readily accessible and no restrictions were noted.
The Reliability Section compiles failures that occurred during structural durability testing. Breakdowns are classified according to subsystems. The data in this section are arranged so that those subsystems with more frequent problems are apparent. The problems are also listed by class as defined in Section 2. The test bus encountered no Class 1 or Class 2 failures. Of the 17 reported failures, 15 were Class 3 and two were Class 4.
The Safety Test, a double-lane change maneuver, was safely performed in both right-hand and left-hand directions up to a maximum test speed of 45 mph. The performance of the bus is illustrated by a speed vs. time plot. Acceleration and gradeability test data are provided in Section 4, Performance. The average time to obtain 50 mph was 33.94 seconds.
The Shakedown Test produced a maximum final loaded deflection of 0.255 inches under a distributed static load of 31,125 lbs. The test resulted in essentially no permanent deflection of the structure. The Distortion Test was completed with all subsystems, doors and escape mechanism operating properly. No water leakage observed during the test. The Static Towing Test was performed using a target load (towing force) of 27,240 lbs. All four pulls were completed to the full target load with no damage or deformation observed. The Dynamic Towing Test was performed using a front lift tow. The towing interface was accomplished by using a hydraulic, under-wheel lift. The test bus was towed without incident and no damage resulted from the test. The manufacturer does not recommend towing the bus from the rear; therefore, a rear test was not performed. The Jacking and Hoisting Tests were performed without incident. The bus was found to be stable on the jack stands. The minimum jacking clearance, measured with a tire deflated, was 8.00 inches.
A Fuel Economy Test was run on simulated central business district, arterial, and commuter courses. The results were 3.18 mpg, 3.73 mpg, and 7.40 mpg respectively; with an overall average of 4.00 mpg.
A series of Interior and Exterior Noise Tests was performed. This data is listed in Section 7.1 and 7.2 respectively.