Apta (Draft) Specification For: 30-ft, 35-ft, 40-ft, 45-ft, 60-foot (articulated) Transit Buses



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55.3Definitions for specifying openable side window configurations


All side windows, except windows in passenger doors and those smaller than 500 sq in., shall have window panels that are openable by passengers. Openable window panels shall be equipped with latches that secure the window in the fully open and fully closed positions. openable windows with inward-opening transom panels: Each openable side window shall incorporate an upper transom portion. The transom shall be between 25 and 35 percent of the total window area. The lower portion of the window shall be fixed. The transom portion shall be hinged along the lower edge and open inward.

openable windows with sliding transom panels: Each openable side window shall incorporate an upper transom portion. The transom shall be between 25 and 35 percent of the total window area. The lower portion of the window shall be fixed. The transom portion shall consist of two horizontally sliding panels.

openable windows with a fixed transom panel and sliding lower panels: Each openable side window shall incorporate an upper transom portion. The transom shall be between 25 and 35 percent of the total window area. The transom portion of the window shall be fixed. The lower portion shall consist of two horizontally sliding panels.

openable windows with full-height sliding panels: Each openable side window shall consist of two full-height horizontally sliding panels.


Default

No requirements for cyclone cleaner
Alternative

Requirement for cyclone cleaner

An opening in the rear of the bus shall be provided to accommodate a cyclone cleaner. An openable rear window may be used if the window cannot be accidentally closed during the cleaning operation.


55.4Configuration


Alternative

Fixed side windows

All side windows shall be fixed in position, except as necessary to meet the emergency escape requirements.

Alternative

Operable side window configurations

All side windows, except windows in passenger doors and those smaller than 500 sq in., shall have window panels that are operable by passengers. Operable window panels shall be equipped with latches that secure the window in the fully open and fully closed positions.



[Agency shall then specify one of the following options.]

Alternative



Operable windows with inward-opening transom panels (fixed bottom, tip-in top)

Each operable side window shall incorporate an upper transom portion. The transom shall be between 25 and 35 percent of the total window area. The lower portion of the window shall be fixed. The transom portion shall be hinged along the lower edge and open inward.

Alternative

Operable windows with sliding transom panels

Each operable side window shall incorporate an upper transom portion. The transom shall be between 25 and 35 percent of the total window area. The lower portion of the window shall be fixed. The transom portion shall consist of two horizontally sliding panels.

Alternative

Operable windows with a fixed transom panel and sliding lower panels (top fixed, bottom slide)

Each operable side window shall incorporate an upper transom side. The transom shall be between 25 and 35 percent of the total window area. The transom portion of the window shall be fixed. The lower portion shall consist of two horizontally sliding panels.

Alternative

Operable windows with operable transom panel and sliding lower panels

Each operable side window shall incorporate an upper transom portion. The transom shall be between 25 and 35 percent of the total window area. The transom portion of the window shall be hinged at lower edge and open inward. The lower portion shall consist of two horizontally sliding panels.

Alternative

Operable windows with full-height sliding panels

Each operable side window shall consist of two full-height horizontally sliding panels.

All side windows shall be easily replaceable without disturbing adjacent windows and shall be mounted so that flexing or vibration from engine operation or normal road excitation is not apparent.

The windows shall be designed and constructed to enable a mechanic to remove and replace one window in less than 15 minutes.


55.5Materials


default

Safety glass glazing panels

Side windows glazing material shall have a 3/16 in. nominal thickness tempered safety glass. The material shall conform to the requirements of ANSI Z26.1-1996 Test Grouping 2 and the Recommended Practices defined in SAE J673.

Alternative

Polycarbonate glazing panels (not available on hidden frame windows)

Side window glazing material shall have a 1/4 in. nominal thickness. The material shall conform with the requirements of ANSI Z26.1-1996 Standard for Type AS-5 Safety Glazing Materials except for Test Number 17, which shall subject the specimens to 100 cycles with less than 4 percent hazing and 500 cycles with less than 12 percent hazing. Windows shall be polycarbonate sheet with an abrasion resistant coating on both sides of the window

Alternative

Acrylic glazing panels (not available on hidden frame windows)

Side window glazing material shall have a 1/2 in. nominal thickness. The material shall conform with the requirements of ANSI Z26.1-1996 Standard for Type AS-5 Safety Glazing Materials except for Test Number 17, which shall subject the specimens to 100 cycles with less than 4 percent hazing and 500 cycles with less than 12 percent hazing. Windows shall be cell cast acrylic sheet with an abrasion resistant coating on both sides of the window.

Alternative

Laminated glazing panels

Side windows glazing material shall have 1/4 in. nominal thickness laminated safety glass. The material shall conform to applicable requirements of ANSI Z26.1-1996 and the Recommended Practices defined in SAE J673.

Alternative

Laminated and tempered safety glazing with anti-vandalism polyester sacrificial film

All glazing material that is aft of the standee line shall be equipped with 6 mm laminated polyester film. This material shall be easily installed and removed without the use of specialized tools. Polyester film shall adhere to the window and be resistant to peeling, curling and discoloration by ultraviolet rays. The film shall withstand normal cleaning operations.

Alternative

Anti-vandalism sacrificial liner (“quick change”)

All glazing material aft of the standee line shall be equipped with necessary bracketry, fasteners and clear acrylic liner that shall be easily removable in the event of vandalism. The acrylic liner shall be held in place by a metal channel or by a series of metal clips, shall be clear and shall have minimal effect on the transmittance of the underlying glazing. This material shall not be adversely affected by ultraviolet rays and shall withstand normal cleaning practices. The installation of the liner shall prevent clouding or fogging. A mechanic without the use of any specialized tools shall be able to easily remove and replace the acrylic liner in 2 minutes or less. This acrylic sacrificial liner must be replaced without removing the window from its installed position on the bus, without removing the tempered glazing from the sash, and without the removal or manipulation of the window assembly’s rubber molding.

Windows on the bus sides and in the rear door shall be tinted a neutral color, complementary to the bus exterior. The maximum solar energy transmittance shall not exceed 37 percent, as measured by ASTM E-424. Luminous transmittance shall be measured by ASTM D-1003. Windows over the destination signs shall not be tinted.

Default (light)



55 percent luminous transmittance
Default (dark)

27 percent luminous transmittance
Alternative

Property to specify, but by no less than 16 percent
Default

Safety glass glazing panels

Side windows glazing material shall have a 1/4 in. nominal thickness tempered safety glass. The material shall conform to the requirements of ANSI Z26.1 Test Grouping 2 and the Recommended Practices defined in SAE J673.

Alternative

Polycarbonate glazing panels

Side window glazing material shall have a 1/4 in. nominal thickness. The material shall conform to the requirements of ANSI Z26.1-1977 Standard for Type AS-5 Safety Glazing Materials, except for Test Number 17, which shall subject the specimens to 1000 cycles and the arithmetic mean of the percentages of light scattered shall not exceed 5 percent. Windows shall be polycarbonate sheet with an abrasion-resistant coating on both sides of the window

Alternative

Acrylic glazing panels

Side window glazing material shall have a 1/2 in. nominal thickness. The material shall conform to the requirements of ANSI Z26.1-1977 Standard for Type AS-5 Safety Glazing Materials, except for Test Number 17, which shall subject the specimens to 1000 cycles and the arithmetic mean of the percentages of light scattered shall not exceed 5 percent. Windows shall be cell cast acrylic sheet with an abrasion-resistant coating on both sides of the window.

Alternative

Laminated glazing panels

Side windows glazing material shall have 1/4 in. nominal thickness laminated safety glass. The material shall conform to applicable requirements of ANSI Z26.1 and the Recommended Practices defined in SAE J673.

Alternative

Anti-vandalism polyester sacrificial film

All glazing material that is aft of the standee line shall be equipped with 6 mm laminated polyester film. This material shall be easily installed and removed without the use of specialized tools. Polyester film shall adhere to the window and be resistant to peeling, curling and discoloration by ultraviolet rays. The film shall withstand normal cleaning operations.

Alternative

Anti-vandalism sacrificial liner (“storm window type”)

All glazing material aft of the standee line shall be equipped with necessary bracketry, fasteners and clear acrylic liner that shall be easily removable in the event of vandalism. The acrylic material shall be clear and shall have minimal effect the transmittance of the underlying glazing. This material shall not be adversely affected by ultraviolet rays and shall withstand normal cleaning practices. The installation of the liner shall prevent clouding or fogging. A mechanic shall be able to easily remove and replace the acrylic liner without the use of any specialized tools in 5 minutes or less.

Windows on the bus sides and in the rear door shall be tinted a neutral color, complementary to the bus exterior. The maximum solar energy transmittance shall not exceed 37 percent, as measured by ASTM E-424, and the luminous transmittance shall be no less than 16 percent, as measured by ASTM D-1003. Window at the destination/location sign shall not be tinted in the vicinity of the sign.

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