(a)
This column gives the permitted (minimum - maximum) range of the fit or clearance in inches (and millimeters). You can use these limits with all mixtures of new parts or parts which are used.
(b)
The limits are found from the minimum and maximum values which are specified in the New Part Reference Dimensions column. (See Example 1)
(c)
Some limits are made larger to be more applicable than the new part conditions. These larger limits are identified with an asterisk (*) adjacent to the value. (See Example 2)
~.............................................................................. | EXAMPLE 1 | | | ................................................................................ | | | | NEW PART REFERENCE | | | I | ...................................... | REF | F | | DIMENSIONS | LIMITS | | NO | R | DESCRIPTION | MIN MAX | MIN MAX | ................................................................................
|1812 | | Bearing | 0.508 0.512| |
| | | |(12.903) (13.005)| |
| | | | | |
| | | Support | 0.517 0.527| 0.005 0.019 |
| | | |(13.131) (13.385)|(0.126) (0.482)|
| | | | | |
2.....…...…...............................….................…..................1 NOTE: In Example 1, compare the dimensions for the bearing and support to find
____ the limits:
0.517 (-) 0.512 = 0.005
(13.131) (13.005) (0.126)
0.527 (-) 0.508 = 0.019
(13.385) (12.903) (0.482)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
~.............................................................................. | EXAMPLE 2 | | | ................................................................................ | | | | NEW PART REFERENCE | | | I | ...................................... | REF | F | | DIMENSIONS | LIMITS | | NO | R | DESCRIPTION | MIN MAX | MIN MAX | ................................................................................
|1812 | | Bearing | 0.508 0.512| |
| | | |(12.903) (13.005)| |
| | | | | |
| | | Support | 0.517 0.527| 0.005 0.020* |
| | | |(13.131) (13.385)|(0.126) (0.508)*|
2.....…...…...............................….................…..................1
NOTE: In Example 2, the limits are larger than the usual limits as shown by the
____ asterisk (*).
S 916-007-N00
(2)
You can use one of the two applicable limits for engines which are scheduled for a repair which is not fully done.
(a)
You can also get a second set of limits which are contained by the lines (See Example 3). These limits, which are contained by the lines, are larger than the usual limits and are used with engines which are scheduled for a repair which is not fully done.
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~.............................................................................. | EXAMPLE 3 | | | ................................................................................ | | | | NEW PART REFERENCE | | | I | ...................................... | REF | F | | DIMENSIONS | LIMITS | | NO | R | DESCRIPTION | MIN MAX | MIN MAX | ................................................................................
|1812 | | Bearing | 0.508 0.512| |
| | | |(12.903) (13.005)| |
| | | | | |
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