MIDWAY SPECIALTY VEHICLES, LLC Download PDF Report
Midway Specialty Vehicles, LLC. submitted a model 2010 Sprinter Pinnacle, diesel-powered 17 seat (including the driver) 23-foot bus, for a 7 yr/200,000 mile STURAA test. Testing started on October 27, 2009 and was completed on March 1, 2010. 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 was started on November 6, 2009 and was completed on February 23, 2010.
The interior of the bus is configured with seating for 9 passengers including the driver. Free floor space will accommodate 8 standing passengers and 2 dedicated wheelchair positions resulting in a potential load of 17 persons and 2 wheelchair positions. At 150 lbs per person, this load results in a measured gross vehicle weight of 11,890In order to avoid exceeding the GAWR (7,720 lbs) of the rear axle Ballast for 1 standing passenger and 1 wheelchair position was eliminated. This reduction from full capacity resulted in an adjusted measured gross vehicle weight of 11,160 lbs and was used for all dynamic testing. The seated load weight segment was performed at an SLW of 10,730 lbs and the final segment was performed at a CW of 8,220 lbs. Durability driving resulted in unscheduled maintenance and failures that involved a variety of subsystems. A description of failures and a complete and detailed listing of scheduled and unscheduled maintenance are provided in the Maintainability section of this report.
Accessibility, in general, was adequate, components covered in Section 1.3 (Repair and/or Replacement of Selected Subsystems) with the exception of the alternator were found to be readily accessible and no restrictions were noted. In order to access the alternator, the A/C compressor must first be removed.
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 one reported problem is also listed by class as defined in Section 2. The test bus encountered no Class 1, 2 or Class 4 failures. The one reported failure was a Class 3.
The Safety Test, (a double-lane change, obstacle avoidance test) 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 17.33 seconds.
The Shakedown Test produced a maximum final loaded deflection of 0.236 inches with a permanent set ranging between -0.001 to 0.005 inches under a distributed static load of 7,575 lbs. The Distortion Test was completed with all subsystems, doors
and escape mechanisms operating properly. No water leakage was observed throughout the test. All subsystems operated properly.
The test bus submitted for testing was not equipped with any type of tow eyes or tow hooks, therefore the Static Towing Test was not performed. The Dynamic Towing Test was performed by means of a front-lift tow. The towing interface was accomplished using a hydraulic under-lift wrecker. The 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 also performed without incident. The bus was found to be stable on the jack stands, and the minimum jacking clearance observed with a tire deflated was 8.3 inches.
A Fuel Economy Test was run on simulated central business district, arterial, and commuter courses. The results were 9.90 mpg, 10.40 mpg, and 16.47 mpg respectively; with an overall average of 11.34 mpg.
A series of Interior and Exterior Noise Tests was performed. These data are listed in Section 7.1 and 7.2 respectively.