attachment 2 section i ? technical specifications commuter coach ...
attachment 2 section i ? technical specifications commuter coach ...
attachment 2 section i ? technical specifications commuter coach ...
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2.12.1.2 THERMAL INSULATION<br />
Page 30<br />
ATTACHMENT 2<br />
The combination of inner and outer panels on the sides, roof, and ends of the <strong>coach</strong>, and insulating<br />
materials shall provide a thermal insulation sufficient to meet the interior temperature requirements.<br />
The <strong>coach</strong> body shall be thoroughly sealed so that drafts cannot be felt by the driver or passengers<br />
during normal operations with the passenger doors closed.<br />
2.12.1.3 SOUND INSULATION<br />
The combination of inner and outer panels and any material used between them shall provide sufficient<br />
sound insulation so that a sound source with a level of 80 dBA measured at the outside skin of the<br />
<strong>coach</strong> shall have a sound level of 60 dBA or less at any point inside the <strong>coach</strong>. These conditions shall<br />
prevail with all openings, including doors and windows, closed and with the engine and accessories<br />
switched off.<br />
The bus generated noise level experienced by a passenger at any seat location in the <strong>coach</strong> shall not<br />
exceed 80 dBA and the driver shall not experience a noise level of more than 70 dBA under the<br />
following test conditions. The <strong>coach</strong> shall be empty except for test personnel, not to exceed 4 persons,<br />
and the test equipment. All openings shall be closed and all accessories shall be operating during the<br />
test. The <strong>coach</strong> shall accelerate at full throttle from a standstill to 35 mph on level commercial asphalt<br />
or concrete pavement in an area free of large reflecting surfaces within 50 feet of the <strong>coach</strong> path.<br />
During the test, the ambient noise level in the test area shall be at least 10 dB lower than the <strong>coach</strong><br />
under test. Instrumentation and other general requirements shall conform to SAE Standard J366. If the<br />
noise contains an audible discrete frequency, a penalty of 5 dBA shall be added to the sound level<br />
measured.<br />
2.12.1.4 REAR SEAT INSULATION<br />
Special design consideration shall be given to insulation in the area above the engine compartment.<br />
Fiberglass or other suitable material shall be applied, together with adequate ventilation, to provide<br />
temperatures consistent with the remainder of the <strong>coach</strong>.<br />
Seat cushions and seat backs shall be suitably insulated to prevent elevated temperature of the seat itself<br />
and no cushion or back shall be measurably hotter as compared to any other seat in the <strong>coach</strong>.<br />
2.13 ANCILLARY FEATURES<br />
2.13.1 DRIVER'S AREA<br />
2.13.1.1 VISORS<br />
Three roller type sunscreens shall be provided at the right and left hand windshield and at the driver's<br />
side window. Guide rods shall be located at each end of each screen to allow for infinite positioning.<br />
The sunscreens shall be shaped to minimize light leakage between the sunshades and windshield pillars.<br />
The sunscreens shall not obstruct air flow from the climate control system or obstruct the operation of
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