(a)
If you do not find a crack, blend the area to 0.060 inch (1.524 mm) more than the depth of the crack.
(b)
If you find a crack, make a mark around the crack.
1) Blend the area to a depth that is 0.060 inch (1.524 mm) more than the depth of the crack.
(c)
Do a fluorescent penetrant inspection of the area.
1) Continue to blend and examine the area until you cannot find a crack.
(d)
Before the subsequent 121st hour of operation, do an eddy current inspection to check for cracks.
(e)
Make sure the repair is not more than the limits in Figure 803.
(f)
If the depth of the repair is more than the limits, replace the blade (AMM 72-31-02/401).
S 328-005-N00
(4)
Polish the blended areas.
S 938-006-N00
(5)
Write the depth of the blend with a vibration peen on the blade platform area (Fig. 806).
(a)
Before the dimension, put the letter "L" for a leading edge or "T" for a trailing edge blend.
(b)
The new dimension is the total of the new blend plus the other dimensions on the blade platform.
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72-31-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
1
A-A
L-A1060
1. BLADE REPAIR MARKING MAY BE MADE IN THIS AREA. MARKING AREA IS DEFINED AS 0.100 INCH (2.540 MM) FROM PLATFORM EDGES AND AIRFOIL-TO-PLATFORM FILLET RADIUS.
1st-Stage (Fan) Blade Repair Marking Area
Figure 806
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72-31-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CAUTION: DO NOT REMOVE THE OTHER REPAIR CODES FROM THE BLADE
_______ PLATFORM. THESE CODES CAN SHOW REPAIRS OTHER THAN THE BLEND DEPTH. THESE CODES WILL BE USED FOR OTHER PROCEDURES.
(c) Remove all of the remaining blend dimensions from the blade platform.
S 828-007-N00
(6)
After you repair all of the damage on the blades, do these steps:
(a)
Look for the blades which had a large quantity of material removed during the repair.
(b)
If two or more of these repaired blades are adjacent, move one or more or them to a new location.
NOTE: When you move a blade, move it and its matched
____ moment blade which is 180 degrees apart.
(c) If you cannot symmetrically move the blades around the rotor, we recommend that you do a vibration survey (AMM 71-00-00/501, Test No. 8).
TASK 72-31-02-968-008-N00
3. Replace the 1st-Stage Fan Blade Platform Rubber Seal (Fig. 807)
____________________________________________________
A. Consumable Materials
(1)
G01077 Paper - Emery (No. 250 Grit)
(2)
G00834 Cloth - Cotton, Lint-free
(3)
A00659 Adhesive - Neoprene (PWA 36027)
B.
References
(1)
AMM 72-42-04/201, Solvent - Degreasing of Parts by Wiping (SPOP 208)
(2)
IPC 72-31-02 Fig. 5
C.
Access
(1)
Location Zone
412 Engine No. 1
422 Engine No. 2
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