FED-STD-791D
3. Contact Surface
4. Front
Cage
5. Rear
6. Outside diameter surface
7. Front
Outer race
8. Rear
9. Contact surface
10. Front
Inner race
11. Rear
6.7.2 Computation of overall deposit rating.
6.7.2.1 An area demerit rating is determined according to the area covered by the deposit
as follows:
Percent area covered
= area demerit covering
10
Surface deposits are not normally subdivided into areas smaller than 5%.
6.7.2.2 A rating for each inspected item is obtained by multiplying the area demerit
rating by the demerit value assigned in Table II and summing all such results to account for
100% of the item being inspected. In the event that more than one type of deposit is present on
the area being inspected, the rating for that area item is the total of the individual rating values.
The deposit rated is that which is visible without the removal of another deposit. Double ratings,
such as sludge over varnish, are not used. The rating for the test bearing is obtained by taking a
sum of the 11 rated areas and dividing by 11. The rating for each item is then modified by
multiplying by the assigned weight factor which will yield a demerit rating as follows:
Major item
Rating
Factor
Demerits
End
X1
1
X1
Spacer and nut
X2
2
2X2
Heater mount front
X3
3
3X3
Heater mount rear
X4
3
3X4
Seal plate
X5
1
X5
Test bearing
X6
5
5X6
6.7.2.3 The overall deposit rating is the sum of the major item demerits divided by six.
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