Memorandum - NHTSA

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IV-17 The DVA and the Access Board specify a 3 1.25 mm (0.62s") maximum vertical gap and 25 IT m (0.50") maximum horizontal gap between the lift and the bus body. The FTA-sponsored guidelines and SAE draft recommended practice all have maximum bus body to lift gap allowances. Platform Deflection (S6.4.5) - The Final Rule allows no more than 1.8 degree maximum lift platform deflection angle, measured relative to the bus floor, for the entire unloaded range of operation of the lift and 3 degrees maximum deviation from its unloaded position when loadec 1 with 272 kg mass (600 lbs.). The angle is measured between an axis perpendicular to the lift platform surface and an axis perpendicular to the vehicle floor. The maximum allowable change in the angle is 4.8 degrees measured in any direction, between the axis perpendicular to the vehicle floor and platform reference planes when loaded with 272 kg mass (600 lbs.). The standee or wheelchair lift user's weight on the lift platform causes deflection of the lift relative, to the bus floor, similar to the deflection of a cantilever beam. Establishing a maximum platfom i deflection level assures stability for the user, particularly someone with a walker, and controls the ramp or grade of the lift so an unattended person can manually roll the wheelchair off the lift i nto the bus. Lift deflection is measured independent of bus roll. The agency believes that all personal and commercial lift products will pass the deflection test. Platform Edge Guard Height (S6.4.6) - Edge guards are low, fixed, vertical walls, which run along the length of both sides of the platform and prevent wheeled mobility aids from rolling,
IV-18 sliding or being driven over the side of the platform. They are positioned parallel to the forward or rearward operating direction of the wheelchair and are designed to deflect the wheelchair's tires. <strong>NHTSA</strong> is requiring that during lift operation, the lift platform is to have continuous edl ;e guards parallel to the direction of loadinghnloading along each side. Edge guards mounted on the lift platform are to have a minimum height of 38 mm (1 SO") measured vertically from the platform. The previous section (S6.5.4.6) defined the maximum allowable vertical 13 mm (0.50") and horizontal gaps 6.5 mm (0.25") for fixed and moving edge guards. An edge guard requirement and minimum edge guard height are required by both the FTA-sponsored guidelines and the ADA standards (49 CFR 38.23(b)(5)). The California Administrative Code specifies a one inch minimum height for edge guards, wh ile the DVA and SAE have no requirement. The Access Board recommends 38 mm (1S") (minimum). A 38 mm (1SO") requirement, consistent with the Access Board's guidelines, is being adopted and applies to any part of the lift platform exposed or operated outside the perimeter of the bus. For example, an elevator type lift, operated entirely within the outside perimeter of the bus, would not need edge guards providing gaps between the side of the platform and the bus structure do not exceed gap requirements. All lift equipment currently iri production are expected to comply. 9. Wheelchair Retention Device (S6.4.7, S7.7 and S7.13) - The outer bamer or wheelchair retention device of the platform is the only mechanical means which prevents the wheelchair from rolling, sliding or being driven inadvertently off the platform, when the platform is greater
Page 1 and 2: Subject: From: To: U.S.Department o
Page 3 and 4: TABLE OF CONTENTS Summary..........
Page 5 and 6: s-2 The annual number of persons in
Page 7 and 8: 11. BACKGROUND 11- 1 Guidelines per
Page 9 and 10: 11-3 and strength; control panel le
Page 11 and 12: 111-2 Generally, there is very litt
Page 13 and 14: 111-4 Table 111-1 Preliminary Natio
Page 15 and 16: 111-6 The NEISS database lacks the
Page 17 and 18: 111-8 Public Transit & Paratransit
Page 19 and 20: w-2 identifying the relevant lift c
Page 21 and 22: IV-4 MEASURE RED FLASHING BEACON OR
Page 23 and 24: IV-6 Acceleration is to be measured
Page 25 and 26: IV-8 FIGURE IV-2 :i a la Y t Permir
Page 27 and 28: IV-10 and vehicle size. This requir
Page 29 and 30: v-12 7. Prepare test block fnction
Page 31 and 32: IV-14 Gaps, Transitions and Opening
Page 33: Figure m-3 Allowable transition dim
Page 37 and 38: v-20 traveling too fast, in the for
Page 39 and 40: WC Retention Overload Test 67.13) I
Page 41 and 42: IV-24 The lift is raised to the flo
Page 43 and 44: N-26 (2 square inches) applicator a
Page 45 and 46: N-28 sufficient to adequately illum
Page 47 and 48: IV-30 lack of follow-up training. N
Page 49 and 50: IV-32 16. Backup Operation (S6.9) -
Page 51 and 52: IV-34 This “looked but did not se
Page 53 and 54: W-36 e Clearance test block (S7.1.3
Page 55 and 56: IV-38 Structural Integrity, to iden
Page 57 and 58: IV-40 NHTSA assumes that the large,
Page 59 and 60: V. BENEFITS v-1 Serious injuries an
Page 61 and 62: v-3 retention strength test, CG and
Page 63 and 64: v-5 objective terms which should le
Page 65 and 66: VI-2 subject to the ADA requirement
Page 67 and 68: VI-4 averaged 35,000 units per year
Page 69 and 70: VI-6 In order to make an estimate o
Page 71 and 72: Cost Estimates VI-8 New Lift Hardwa
Page 73 and 74: VI- 10 close a circuit and send a s
Page 75 and 76: VI-12 FMVSS No. 141 Lift Certificat
Page 77 and 78: VI- 14 Total Cost for Public-Use Li
Page 79 and 80: VII. LEADTIME VII-1 Since the lift-
Page 81 and 82: VIII-2 Table VIII-1 SUMMARY OF SBA
Page 83 and 84: VIII-4 many private transit bus ope
Page 85 and 86:
VIII-6 Many hundreds of small busin
Page 87 and 88:
VIII-8 adaptive driving equipment f
Page 89 and 90:
VIII-10 Facts Book, 7.2 percent of
Page 91 and 92:
A- 1 REFERENCES 1. Americans with D
Page 93 and 94:
A-3 25. A Directory of UMTA-Funded
Page 95 and 96:
Figure 1 Dirgm Showing the Part8 of
Page 97 and 98:
5 Figure 2. Isometric View of Platf
Page 99 and 100:
PLATFORM DEFLECTION ANGLE DEFLECTIO
Page 101 and 102:
.. Lln UP, OUTER BARRIER UP LIFT MI
Page 103 and 104:
i I i I I I I i 1 i I ! j I I ~ __
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Memorandum - NHTSA

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