|
2.5 AQL - NORMAL
INSPECTION
| Lot Size |
Sample
Size |
Acc |
Rej |
Criteria for Continuing
Inspection |
| 1 - 8 |
All |
* |
* |
N/A |
9 - 150
(Cumulative S/S) |
8
20 |
0
1 |
2
2 |
If 1 defective found, go to S/S of
20. ** |
151 - 280
(Cumulative S/S) |
20
32 |
1
2 |
3
3 |
If 2 defectives found, go to S/S of
32. |
281 - 500
(Cumulative S/S) |
20
50 |
1
3 |
4
4 |
If 2 - 3 defectives found, go to S/S
of 50. |
501 - 1200
(Cumulative S/S) |
32
80 |
1
5 |
6
6 |
If 2 - 5 defectives found, go to S/S
of 80 |
1201 - 3200
(Cumulative S/S) |
50
125 |
2
7 |
8
8 |
If 3 - 7 defectives found, go to S/S
of 125 |
3201 - 10,000
(Cumulative S/S) |
80
200 |
3
10 |
11
11 |
If 4 - 10 defectives found, go to
S/S of 200 |
10,001 - 35,000
(Cumulative S/S) |
125
315 |
5
14 |
15
15 |
If 6 - 14 defectives found. go to
S/S of 315 |
Over 35,000
(Cumulative S/S) |
200
500 |
8
21 |
22
22 |
If 9 - 21 defectives found. go to
S/S of 500 |
* Reject only
defectives found.
** If lot size is 20
units or less, inspect all and reject only defectives found.
Here is how the random sampling works:
- Let us say that the shipment or lot size is 2,000 items or pieces.
- Then,
- (1) Take a sample of 50 pieces at random from this shipment.
- (2) Inspect all 50 pieces.
- (3) If 2 or less defective pieces are found, accept the shipment.
- (4) If 8 or more defective pieces are found, reject the shipment.
- (5) If 3 to 7 defective pieces are found, then take additional 75 samples
at random.
- (6) Inspect all 75 samples.
- (7) If a total of 7 or less defective pieces are found, accept the
shipment.
- (8) If a total of 8 or more defective pieces are found, reject the
shipment.
_^_
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