................................................................................. | Area D | No Damage is | No Damage is | No Damage is | | Platform to | Permitted | Permitted | Permitted | | Airfoil Radius | | | | | | | | | | Leading and | 0.005 inch | 0.150 inch | None (see | | Trailing Edges | (0.127 mm) | (3.810 mm) | Permitted After Repairs) | ................................................................................. | Area E | 0.020 inch | 0.030 inch | 0.060 inch | | Other Surfaces | (0.508 mm) | (0.762 mm) | (1.524 mm) | ................................................................................. | Area F | 0.005 inch | 0.250 inch | 0.300 inch | | Leading Edges | (0.127 mm) | (6.350 mm) | (7.629 mm) | | | | See *[1] | See *[1] | 2..................….................…...............…..........................1
*[1] This limit may be found to be 0.500 inch (12.7 mm) maximum in the CIR
Manual. The higher limit is allowed for necessary bead peen and ECI
at overhaul facility.
S 216-023-N00
(5) Examine the airfoil for arc burn.
NOTE: Signs of arc burn are small circular or semicircular heat
____ damaged areas on the blade surface that can have very small rounded dents, cracks, burned or melted areas.
(a) Arc burn is not permitted.
S 216-024-N00
(6)
Examine the airfoil for cracks.
(a)
You must repair all cracks (AMM 72-31-02/801).
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 866-025-N00
(7)
If you are done with the fan blade inspections, do the steps that follow:
(a)
Remove the protective mat from the inlet cowl.
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TASK 72-31-02-206-026-N00
3. 1st-Stage Fan Blade Part Span Shroud Inspection for Damage (Fig. 603)__________________________________________________________
A. General
(1)
The part span shrouds will be called the shrouds is this task.
(2)
This inspection is done when it is necessary for a detailed inspection during a regular engine inspection check, such as made necessary by the Maintenance Program, or when you think there is foreign object damage.
B.
Equipment
(1)
Protective mat - Rubber Manufacturer's
Association, Grade SC43, neoprene sponge, 1
inch thick, approximately 5x6 feet with warning
streamers attached (3 are necessary).
C.
Consumable Materials
(1)
D00059 Lubricant - PWA 587 (P06-005)
D.
Access
(1)
Location Zone
412 Engine 1 - LPC Hub
422 Engine 2 - LPC Hub
432 Engine 3 - LPC Hub
442 Engine 4 - LPC Hub
E.
Prepare for the Procedure.
S 866-027-N00
CAUTION:_______MAKE SURE YOU USE A PROTECTIVE MAT. IF YOU DO NOT, DAMAGE MAY RESULT TO THE INNER SURFACE OF THE INLET COWL.
(1) Put the protective mat on the inner surface of the inlet cowl.
S 826-028-N00
WARNING:_______USE GLOVES ON YOUR HANDS WHEN YOU HANDLE THE BLADES. THE BLADES ARE SHARP AND CAN CAUSE INJURY TO YOUR HANDS.
(2)
Loosen all of the 1st-stage fan blades, if necessary, to make sure they are free to move at the shroud face at the 12 o'clock location.
F.
Procedure (Fig. 603).
S 216-029-N00
(1)
Examine the fan blades for shrouds that are broken, fractured, have cracks, or are not there.
(a)
A fan blade with a shroud that is broken, fractured, has cracks, or is not there is not permitted.
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