Memorandum - NHTSA

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v-5 If an audible warning is used to comply (S6.1.2), the intensity of the audible warning (>=85 dl 3A @ 500-3000 Hz) is to be measured at 914 mm (3') above the center of the "platform thresholc area." The audible warning signal is continuous until the lift user vacates the platform threshc Id area. Threshold Warning Simal (S6. l), is currently contained in SAE personal lift requiremeii ts, but would be new for transit and paratransit buses. This type of warning is important in the public transportation environment where a lift might be sequentially used by several patrons ai id it is important to personal vans particularly if the lift is rear mounted and the user backs on to he lift. This requirement does not apply to rotary lifts because their lift platform is rotated over tile van/MPV's floor when being loaded. 2. Lift Operational Requirements 66.2) Maximum Velocitv (S6.2.2) and Acceleration 66.2.3) - This requirement is concerned with tl-e maximum allowable operating velocity and acceleration of the lift, both horizontally and vertically, as well as the lift stowage/deploy velocities. The operating velocities and accelerations are measured unloaded and loaded (0 lbs. and 272 kg mass (600 lbs.)), respectively. The stowage/deploy velocities are measured unloaded. The vertical and horizontal velocity components of the lift platform are not to exceed 152 mm/s (6 ids) horizontally or vertically :md the acceleration of the platform is not to exceed 0.30 g's horizontally or vertically. The horizontal/vertical components of the stow/deploy velocity are not to exceed 305 "/s (12 in.'s).
IV-6 Acceleration is to be measured per SAE 521 1, October 1988, with a CFC filter requirement oj’FH = 3 Hz and FN= 5 Hz. The accelerometer for this test is located at the centroid of the lift platform. NHTSA studied the applicability of the CFC 60 filter proposed in the NPRM and determined that it was insufficient. They studied existing University of Virginia (UVA) and VRTC data and determined that a CFC 3 filter was sufficient to attenuate the acceleration signal to a level below the 0.3 g’s limit and, therefore, is recommended for use. A copy of the NHTSA study entitled “Determinationof Electronic Filtering for Post-Processing of Wheelchair Lift Acceleration Data, June 1996” has been placed in the Docket No. NHTSA-98-4511. These minimum performance requirements are consistent with the Access Board’s guidelines. The speed and accelerations are designed to be compatible with existing equipment and shoulc 1 not place a new design requirement on lift manufacturers. Interior Maximum Operating Noise Level (S6.2.4) - This requirement sets a maximum lift operating noise level of 80 dBA inside the bus at a fixed operator position or in the area of the lift platform, during the lift operating cycle. This will allow for the communication of instruction,; between the lift operator and lift user (or vice versa) during both normal and emergency lift us,:. Assuming a maximum communication range of 913 mm (3’) (which should be sufficient durin g lift operation), 80 dBA would be the maximum allowable lift operating noise. (See VRTC reference Human Factors Design Handbook, Second Edition, W.E. Woodson, B. Tillman, and P.
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: IV-4 MEASURE RED FLASHING BEACON OR
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 and 34: Figure m-3 Allowable transition dim
Page 35 and 36: IV-18 sliding or being driven over
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
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VI- 10 close a circuit and send a s
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VI-12 FMVSS No. 141 Lift Certificat
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VI- 14 Total Cost for Public-Use Li
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VII. LEADTIME VII-1 Since the lift-
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VIII-2 Table VIII-1 SUMMARY OF SBA
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VIII-4 many private transit bus ope
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VIII-6 Many hundreds of small busin
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VIII-8 adaptive driving equipment f
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VIII-10 Facts Book, 7.2 percent of
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A- 1 REFERENCES 1. Americans with D
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A-3 25. A Directory of UMTA-Funded
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Figure 1 Dirgm Showing the Part8 of
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5 Figure 2. Isometric View of Platf
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PLATFORM DEFLECTION ANGLE DEFLECTIO
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.. Lln UP, OUTER BARRIER UP LIFT MI
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i I i I I I I i 1 i I ! j I I ~ __
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Memorandum - NHTSA

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