FORWARD VIEW OF FLANGE B1 OR
REAR VIEW OF FLANGE B2

L-A7755 (0000)
Fan Exit Case Inspection Figure 601 (Sheet 2)
D20319
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 216-029-N00
 (3) Visually compare the damage you find on the vanes with the limits in
 Table 602 (Fig. 602). ~............................................................................... | TABLE 602 | | INSPECTION OF THE FAN EXIT VANES | ................................................................................. | Examine | Damage Limits | Necessary Procedure (AMM 72-33-02/801) | .................................................................................
 | Area A:  |  |  No procedure is necessary, but you  |
 | Chord depth |  0.100 inch (2.540 mm) |  must examine it again in less than 50 |
 | (axial  |  maximum *  |  hours and at the next "A" check for  |
 |  length)|  |  deterioration.  If there is deteriora-|
 |  |  |  tion, repair the vane with a small  |
 |  |  |  patch in less than 50 hours.  |
 |  |  |  |
 |  |  More than 0.100 inch  |  Remove the damaged fan exit vane in  |
 |  |  (2.54 mm) in depth.*  |  less than 50 hours.  |
 |  |  |  |

 ................................................................................. | Area B: | | | | Chord depth | 0.100 inch (2.540 mm) | No procedure is necessary, but you | | (axial | maximum * | must examine it again in less than 50 | | length)| | hours and at the next "A" check for | | | | deterioration. If there is deteriora-| | | | tion, repair the vane with a small | | | | patch in less than 50 hours. | | | | | | | Between 0.100-0.375 | Repair the vane with a large patch in | | | inch (2.5-9.5 mm) in | less than 50 hours. | | | depth.* | | | | | | | | More than 0.375 inch | Remove the damaged vane immediately. | | | (9.525 mm) in depth.* | | | | | | | Radial | More than 0.750 inch | Remove the damaged vane immediately. | | Length | (19.050 mm) in length | | | | | | | Quantity | No damage is more than| No procedure is necessary. | | of damage | 0.100 inch (2.540 mm) | | | on each | in depth.* | | | vane | | | | | One (1) is more than | Repair the vane with a large patch in | | | 0.100 inch (2.540 mm) | less than 50 hours. | | | in depth.* | | | | | | | | Two or more that are | Remove the vane in less than 50 hours.| | | more than 0.100 inch | | | | (2.54 mm) in depth.* | | | | | |
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
~............................................................................... | TABLE 602 | | INSPECTION OF THE FAN EXIT VANES | ................................................................................. | Examine | Damage Limits | Necessary Procedure (AMM 72-33-02/801) | .................................................................................
 | Area C for: |  Broken composite  |  Repair the vane with a small patch  |
 |  Nicks,  |  fibers  |  in less than 50 hours.  |
 |  dents,  |  |  |
 |  pits, and |  More than 0.030 inch  |  Remove or replace the vane in less  |
 |  chips  |  (0.762 mm) in depth  |  than 50 hours.  |
 |  |  |  |
 |  |  More than 0.300 inch  |  Remove or replace the vane in less  |
 |  |  (7.620 mm) in width  |  than 50 hours.  |
 |  |  or height  |  |

 ................................................................................. | Area D for: | Chord decreased by | Repair the vane with a small patch in | | Damage | not more than | less than 50 hours. | | that | 0.150 inch (3.810 mm) | | | decreased | | | | the chord | Chord decreased by | Remove or replace the vane in less | | length | more than 0.150 inch | than 50 hours. | | | (3.810 mm) | | ................................................................................. |Delamination | More than 1.0 square | Remove or replace the vane in less | | | inch (645. square mm) | than 50 hours. | | | in area | | ................................................................................. |Delamination/| Full axial width | Replace leading edge up to full | | Missing | both sides | span. | | Wire Mesh | up to full span. | | ................................................................................. | Erosion of | Up to 3.00 inch | Replace wire mesh leading edge up to | | Leading | (76.2 mm) in from OD | the full span. | | Edge | | | | | Beyond 3.00 inch | Install metal shield over vane | | | (76.2 mm) in from OD | leading edge. | | | and ID platform up to | Replace vane at next shop visit. | | | 0.150 inch (3.81 mm) | | | | maximum | | | | | | | | Beyond 3.00 inch | Install metal shield over vane | | | (76.2 mm) in from OD | leading edge. | | | and ID platform up to | Replace vane at next shop visit. | | | 0.150 inch (3.81 mm) | | | | maximum | |
　
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