D.
Procedure
S 968-014-N00
(1)
Do these steps to replace the rubber seal:
(a)
Remove the damaged rubber seal from the blade platform.
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B-B
1.
LENGTH OF APPLICATION OF ADHESIVE UNDERNEATH PLATFORM.
2.
0.000-0.040 INCH (0.000-1.020 mm) - BOTH ENDS.
3.
SEAL
4.
0.480-0.520 INCH (12.190-13.210 mm).
5.
0.300-0.350 INCH (7.620-8.890 mm).
6.
WIDTH OF ADHESIVE APPLICATION FOR PLATFORM LENGTH.
7.
NO CLEANING SOLVENT ALLOWED IN ENCLOSED AREA - BOTH ENDS L-A3791
1st-Stage (Fan) Blade Platform Rubber Seal Replacement
Figure 807 (Sheet 1)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
STAGE 1 LPC
D-D
L-A8824 (0000)
1st-Stage (Fan) Blade Platform Rubber Seal Replacement Figure 807 (Sheet 2)
H75251
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(b) Clean the lower left face of the blade platform by solvent wiping (AMM 70-42-04/201).
NOTE: Look at the trailing edge to find the left side.
____
(c)
Use the emery paper to lightly rub the glossy surface where you will attach the rubber seal.
(d)
Clean surface where you will attach the rubber seal by solvent wiping (AMM 70-42-04/201, SPOP 208).
(e)
Make sure the surface is clean and dry.
(f)
Apply a thin continuous layer of the adhesive, approximately 0.003-0.005 inch (0.076-0.127 mm) thick, on the platform and seal surfaces (Fig. 807). 1) Let the adhesive become tacky.
(g)
Put the rubber seal in the correct position on the blade platform. 1) Push the rubber seal tightly against the blade platform. 2) Let the adhesive have a cure time of 24 hours at room
temperature.
(h)
Remove the unwanted adhesive.
TASK 72-31-02-308-017-N00
4. Restore the Leading Edge Contour of the 1st-Stage Fan Blade Assembly
____________________________________________________________________
A. General
(1)
This restoration repair is for engines that have had unsatisfactory fan performance operation. This repair can also be used to clean and remove fan blade leading edge damage.
(2)
This repair is applicable to fan blade assemblies PN 52A121, 56A621, and 56A821 only.
NOTE: Other part numbers 53A321, 54A821 and 56A511 fan blades must
____ be re-operated by SB PW4ENG 72-655 and re-identified to the new part numbers before you do this repair.
B. Equipment
(1)
PWA 29646 Gage, Inspection
(2)
PWA 29836 Sighting Template
(3)
PWA 29914 Angle Cutter
(4)
PWA 49065 Template, Plastic Chord (For PN
52A121 and 56A821 Blades)
(5)
PWA 75431 Marking Template (For PN 52A121 Blade)
(6)
PWA 75432 Radius Cutter (For PN 52A121 Blade)
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