_ airfoil.
2.
Damage must be separated by 0.5 inch (13 mm)
_ radially and 0.2 inch (5 mmm) from the leading and trailing edges.
3.
There must not be more than 5 damaged blades in
_ each quadrant.
4.
Damage is not more than 5 percent of the blades.
_ c) If the damage is not in the above limits, a maximum service extension of 5 cycles or 10 hours is permitted.
2) Nicks or dents in the other areas (not in Area E) on the leading and trailing edges. a) Any amount of nicks or dents if they are less than 0.03
inch (0.80 mm) deep.
b) If the nicks or dents are equal to or more than 0.03 inch (0.80 mm) deep, they are serviceable only under all the conditions that follow:
1.
There must not be more than 2 damaged areas on each
_ airfoil.
2.
Damage must be separated by 0.5 inch (13 mm)
_ radially and 0.2 inch (5 mmm) from the leading and trailing edges.
3.
There must not be more than 5 damaged blades in
_ each quadrant.
4.
Damage is not more than 5 percent of the blades.
_ c) If the damage is not in the above limits, a maximum service extension of 5 cycles or 10 hours is permitted. 3) Nicks or dents on the concave or convex airfoil surfaces. a) Any amount of nicks or dents only if they are less than
0.015 inch (0.40 mm) deep and the damage does not go
through to the opposite side. b) Up to 5 dents are permitted if they extend less than
0.01 inch (0.25 mm) on the opposite side.
c) In not, they are serviceable only under the conditions that follow:
1.
There must not be more than 2 damaged areas on each
_ airfoil.
2.
Damage must be separated by 0.5 inch (13 mm)
_ radially and 0.2 inch (5 mmm) from the leading and trailing edges.
3.
There must not be more than 5 damaged blades in
_ each quadrant.
4.
Damage is not more than 5 percent of the blades.
_ d) If the damage is not in the above limits, a maximum service extension of 5 cycles or 10 hours is permitted.
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72-00-00
ALL ú ú C01 Page 680R ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Low Pressure Turbine (LPT) Rotor Blade (4th Stage) - Inspection
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4) Missing pieces of metal are serviceable only under all the conditions that follow: a) There must not be more than 2 damaged areas on each
airfoil.
b) Damage must be separated by 0.5 inch (13 mm) radially and 0.2 inch (5 mmm) from the leading and trailing edges.
c) There must not be more than 5 damaged blades in each
quadrant. d) Damage is not more than 5 percent of the blades. e) If the damage is not in the above limits and there is
no N1 engine vibration drift from the last leg reported through the AVM (Fan and LPT), then a maximum service extension of 5 cycles or 10 hours is permitted, to include one complete airfoil missing and any number of missing tip shrouds and their airfoil tips.
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