NOTE: When you repair a blade to remove the damage that
____ is greater than the Service Limits, you can also repair the other damage on the blade. You can repair this other damage on the blade until you get to the Blend Limits for that blade.
(d)
There are no limits to the number of blades that can be repaired in one stage or in all three stages.
(e)
The length of the repair, the radial direction along the leading edge, must be a minimum of four times the depth of the repair.
(f)
The Blend Limits in Table 801 give you the maximum depth of all repairs.
(g)
Blades that show indications of cracks can not be repaired.
(h)
Damage to the leading and trailing edges becomes more important near the fillet area. Thus all damage in Area E must be thought of for repair only after a very careful inspection.
NOTE: You can not blend the blades that are damaged in
____ Area E of the 5th stage.
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(i)
Only use a power drive that limits the speed of the tool to 4000 RPM. Only use the tools that make the correct finish on the surface of the blades. Do not machine the blades too much. No sparks are permitted.
(j)
Use a PWA 49117 or a PWA 101045 Video System Kit through the AP-2 and AP-3 borescope access ports to monitor and measure the repair of the blades that are damaged.
(k)
No edges that are sharp are permitted after the repair of a blade that was damaged.
CAUTION: DO NOT REMOVE THE BURRS WITH A ROTARY FILE OR DAMAGE TO
_______
THE BLADES CAN OCCUR.
(l)
The burrs and material that is rolled over is not permitted and must be removed with a rotary stone.
(m)
After the blades are repaired, it is necessary to polish the blades that were repaired.
F.
Put the Airplane Back to Its Usual Condition
S 088-011-N00
(1)
Remove the PWA Blending Kit 49057 (Fig. 802).
S 088-012-N00
(2)
Remove the PWA Video System Kit 49117 (alternative) or PWA Video System Kit 101045 (alternative) (Fig. 802).
S 418-010-N00
(3)
Install the plugs in the borescope ports AP-2 and AP-3
(AMM 72-00-00/601).
S 418-011-N00
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(4) Close the right thrust reverser (AMM 78-31-00/201).
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(5) S 418-012-N00Close the right core cowl panel (AMM 71-11-06/201).
(6) S 418-013-N00Close the right fan cowl panel (AMM 71-11-04/201).
(7) S 448-014-N00Do the activation procedure for the thrust reverser (AMM 78-31-00/201).
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COMBUSTION SECTION - DESCRIPTION AND OPERATION
______________________________________________
1. General
_______
A. The combustion (diffuser and combustor) section consists of a cast nickel alloy case, a cast compressor exit (15th-stage) stator, the No. 3 bearing compartment, and the outer annular combustion chamber (liner).
B. The diffuser and combustor section straightens the circular whirl-pattern airflow from the section of the high pressure compressor (HPC), reduces air velocity, increases pressure, and provides a proper air-fuel mixture for combustion.
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