(c)
Fan blades that have shrouds that are broken, have cracks or are not there, are not permitted.
S 216-035-N00
(7)
Examine Area F (shroud edges) for damage.
(a)
No damage is permitted.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b) You must repair all damage that is less than the repair limits (AMM 72-31-02/801). 1) The maximum blend depth is 0.060 inch (1.524 mm).
S 646-069-N00
WARNING:_______DO NOT PERMIT THE LUBRICANT TO TOUCH YOUR SKIN. IF IT DOES, WASH YOUR SKIN IMMEDIATELY WITH SOAP AND WATER. THE LUBRICANT CAN CAUSE INJURY TO YOUR SKIN
(8)
If there is not sufficient lubricant on the hardface surface of the shroud, do the steps that follow.
(a)
With a brush, apply a layer of lubricant to area B, the hardface surface of the shroud.
NOTE: The liquid-paste Molykote type G-N lubricant is easier
____ to apply, and lubricates a longer time than the spray type Molykote.
(b) Remove the unwanted lubricant from the outer surfaces of the shroud and the blade airfoil.
S 966-036-N00
(9)
Turn the rotor to put the adjacent two blades at the 12 o'clock position.
S 216-037-N00
(10)
Do this inspection procedure again until you examine all the fan blades.
S 866-038-N00
(11)
If you are done with the fan blade inspections, remove the protective mat from the inlet cowl.
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TASK 72-31-02-206-039-N00
4. 1st-Stage Fan Blade Airfoil Inspection for Bends and Curl (Fig. 605)
_________________________________________________________
A. General
(1)
This inspection is done when you think there is foreign object damage (FOD).
B.
Equipment
(1)
Protective mat - Rubber Manufacturer's
Association, Grade SC43, neoprene sponge, 1
inch thick, approximately 5x6 feet with warning
streamers attached (3 required).
C.
Access
(1)
Location Zone
412 Engine 1 - LPC Hub
422 Engine 2 - LPC Hub
432 Engine 3 - LPC Hub
442 Engine 4 - LPC Hub
D.
Procedure (Fig. 605)
S 866-040-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 216-041-N00
WARNING: TO PREVENT INJURY TO YOUR HANDS, GLOVES SHOULD BE WORN WHEN YOU
_______
HANDLE THE BLADES.
(2) Examine the tip of the blade for bends and curl.
NOTE: A curl is a small bend.
____
(a)
Tip curl is permitted as follows: 1) Index 1 must not be more than 0.200 inch (5.080 mm). 2) No more than three adjacent blades with tip curl are
permitted. 3) No more than a total of five blades with tip curl are permitted. 4) Tip curl with cracks or tears is not permitted.
(b)
A blade with the conditions that follow can continue in service without repair for 50 hours. 1) Index 1 must not be more than 2.000 inches (50.800 mm). 2) Index R must not be more than 0.500 inch (12.700 mm).
(3)
Examine the leading and trailing edges for bends.
S 216-042-N00
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