KKK-B-1579B
passenger comfort. Seat backs shall be not less than 18 inches free height from seat cushion to
top of seat back cushion. The top, the upper corners, and the upper 10 inches of the rear surface
of each passenger seat back (except the rearmost seats) shall be constructed of or covered with
force distributing material. The material shall minimize force and spread the area of contact upon
impact by an occupant in the next seat to the rear. The rear surface of the seat back below the
force distributing material shall be upholstered or on type I, II, III, and IV buses it may be
covered with aluminized steel or bright finish zinc coated steel. Seats shall be secured to prevent
shifting under all operating conditions. Anchorage for adult seats shall conform to
FMVSS 222/6. Seats located at or near wheelhousings shall be installed to minimize
interference with passenger comfort. Seat spacing shall be not less than 30 inches on centers for
type I, II, III and IV buses and the spacing on centers allowed by Federal Motor Vehicle Safety
Standard No. 222 for type V, VI and VII buses shall provide a minimum of 24 inches knee room.
Spacing at barrier, modesty panel or other obstructions at the door entrance shall be not less than
12 inches from front of seat cushion on type I, II, III and IV.
3.5.8.1 Driver's seat. Driver's seat shall be heavy-duty, bus-type, pedestal mounted, and
adjustable fore and aft and for height without the use of tools. Seat shall be positioned for
convenient and safe operation of all controls by the driver. The seat cushion and back shall be
padded, contoured to provide maximum driver comfort, and covered with heavy-duty vinyl
simulated leather. The seat and back shall be substantially constructed and provide driver
comfort. A lap style seat belt with retractors shall be installed for the driver's seat. When
specified see 6.2), seat tilting adjustment shall be furnished.
3.5.8.2 Seat covering. Seat and force distributing cover material shall be first grade,
heavy duty, plastic-coated, grained surface fabric of not less than 42 ounce weight per linear yard
of 54-inch width or shall be 54-inch, 35 ounce 2.73 polyester drill. All seat materials shall be
flash- flameproof and nonexplosive. Color of upholstery shall be appropriate with exterior color
and shall harmonize with interior color.
3.5.9 Stanchions, barriers, and grab rails. Except for type V, VI and VII buses, which
shall conform to Federal Motor Vehicle Safety Standard No. 222, a modesty panel shall be
provided at rear of service door entrance and between driver and front passenger seat. A
stanchion and grab rail at front and rear of entrances, arranged, to safely assist passengers
entering or leaving the bus, shall be provided. Except for type V, VI and VII buses, full-length
grab rails shall be attached to the ceiling on each side of the aisle and shall extend from the face
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