Table I—Sample Size Code Letters

Open Table
Batch size Code letter
4 to 8 A.
9 to 15 B.
16 to 25 C.
26 and larger D.

Table II—Sampling Plans for Inspecting Batches

Open Table
Sample size code letter Test sample Test sample size Cumulative test sample size Batch inspection criteria
Acceptance No. Rejection No.
A 1st 4 4 0 1
B 1st 3 3 0 1
C 1st 3 3 0 2
    2d 3 6 1 2
D 1st 2 2 (1) 2
    2d 2 4 (1) 2
    3d 2 6 0 2
    4th 2 8 0 3
    5th 2 10 1 3
    6th 2 12 1 3
    7th 2 14 2 3

1Batch acceptance not permitted at this sample size.

Table III—Batch Sequence Plans

Open Table
Sample size code letter Number of batches Cumulative number of batches Sequence inspection criteria
Acceptance No. Rejection No.
A 2 2 1 (2)
    2 4 2 4
    2 6 3 5
    2 8 4 5
B 2 2 0 (2)
    2 4 1 4
    2 6 2 5
    2 8 3 5
    2 10 4 6
    2 12 5 6
C 2 2 (1) 2
    2 4 0 2
    2 6 0 3
    2 8 1 3
    2 10 2 4
    2 12 3 4
D 2 2 0 2
    2 4 1 3
    2 6 2 4
    2 8 3 4

1Batch sequence acceptance not permitted for this number of batches.

2Batch sequence rejection not permitted for this number of batches.

Table IV—Recommended Format for Vehicle Noise Data Sheet

Open Table
   
Test Report Number: Manufacturer:
VEHICLE:
Trade Name: VIN:
Model Year: Other Reference No:
Configuration Identification: Category Identification:
Test Site Identification and Location:
INSTRUMENTATION:
Microphone Manufacturer: Model No: Serial No:
Sound Level Manufacturer: Model No: Serial No:
Calibrator Manufacturer: Model No: Serial No:
Other and Manufacturer: Model No: Serial No:
TEST DATA:
Approach Gear: Date of Test:
Approach RPM: Temp: Wind:
Acceleration Test:
Deceleration Test:

Acceleration Test

Open Table
        Run No.
1 2 3 4 5
dBA Left
    Right
Highest RPM attained in End Zone
    Calculated Sound Pressure dBA
Deceleration Test with Exhaust Brake Applied
dBA Left
    Right
    Calculated Sound Pressure dBA
TEST Personnel:
               (Name)
Recorded By: Date:.........
               (Signature)
Supervisor: Title:.........
               (Signature)

[41 FR 15544, Apr. 13, 1976, as amended at 42 FR 61460, Dec. 5, 1977]


Tried the LawStack mobile app?

Join thousands and try LawStack mobile for FREE today.

  • Carry the law offline, wherever you go.
  • Download CFR, USC, rules, and state law to your mobile device.