3. Job Set-up
__________
Subtask 72-21-00-941-080
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine.
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(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
(c) Put an ACCESS PLATFORM 1M (3 FT) in position.
4. Procedure
_________
(Ref. Fig. 606/TASK 72-21-00-991-314, 607/TASK 72-21-00-991-315)
Subtask 72-21-00-210-056
A. Full inspection of the fan blades (removed from fan disk) (Ref. Fig. 606/TASK 72-21-00-991-314, 607/TASK 72-21-00-991-315)
CAUTION : DO NOT CLEAN TITANIUM PARTS WITH COMPOUNDS WHICH CONTAIN
_______ HALOGEN. HALOGEN DECREASES THE STRENGTH OF TITANIUM.
NOTE : The removal of the fan blades is necessary to do a full inspection
____
of those blades (Ref. TASK 72-21-00-000-007).
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1. Fan rotor blades for:
A. Cracks or tears.
(1) Operational Not serviceable. Replace pair of matched
cracks. blades (Ref. TASK 72-21-00-300-028).
(2) FOD caused Not serviceable. Replace blade (Ref. TASK cracks or 72-21-00-000-007) and tears. (Ref. TASK 72-21-00-400-
007), or blend the defects (Ref. TASK 72-21-00-320-003) if damage is within
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B. Nicks, dents and scratches on contour surfaces of root area, and full airfoil out of midspan shroud critical area.
C. Nicks, dents and scratches on leading edge of root area, Area A.
D. Nicks, dents and scratches on trailing edge, Area D.
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R E ECES No limited quantity if no deeper than 0.003 in.
(0.08 mm) after removal of high metal.
No limited quantity if not deeper than 0.006 in. (0.15 mm).
No limited quantity if not deeper than 0.006 in. (0.15 mm).
『E EE E the blending limit of figure. (Ref. Fig. 606/TASK 72-21-00-991-314) Blended fan blades must be repaired following ESM 72-21-01 Rep 01 at first shop visit opportunity.
Replace blade (Ref. TASK72-21-00-000-007) and(Ref. TASK 72-21-00-400-007), or blend the defects(Ref. TASK 72-21-00-320-003) if damage is withinthe blending limit of figure. (Ref. Fig. 606/TASK 72-21-00-991-314) Blended fan blades must be repaired following ESM 72-21-01 Rep 01 at first shop visit opportunity.
Do blending procedure(Ref. TASK 72-21-00-320-003).
Replace blade (Ref. TASK72-21-00-000-007) and(Ref. TASK 72-21-00-400-007), or blend the defects (Ref. TASK 72-21-00-320-003) if damage is within the blending limit of figure. (Ref. Fig. 606/TASK 72-21-00-991-314) Blended fan blades must be repaired following ESM 72-21-01 Rep 01 at first shop visit opportunity.
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E. Nicks, dents and No limited quantity if Replace blade (Ref. TASK scratches on not deeper than 0.03 in. 72-21-00-000-007) and leading edge in (0.76 mm), with 0.40 in. (Ref. TASK 72-21-00-400-Area B. (10.16 mm) max length 007), or blend the defects
for scratches after (Ref. TASK 72-21-00-320-
removal of high metal. 003) if damage is within the blending limit of figure. (Ref. Fig. 606/TASK 72-21-00-991-314) Blended fan blades must be repaired following ESM 72-21-01 Rep 01 at first shop visit opportunity.
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