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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
~............................................................................... | TABLE 601 | | INSPECTION OF AREAS OTHER THAN THE VANES | ................................................................................. | Examine | Damage Limits | Necessary Procedure | ................................................................................. | Total Cir-| 24.000 inches | Damage that is more than the limits | | cumferential| (609.600 mm) maximum | is not permitted. | | length, all | | | | damage, on | | | | each flange | | | ................................................................................. |Repair Welds:| None are permitted | If there are cracks, you must remove | | cracks in | | the case and vane assembly. | | the weld | | | | ................................................................... | Other Areas:| | | | Dents | 0.050 inch (1.270 mm) | Dents that are less than the limits | | | in depth, maximum, | and have no cracks, are permitted. If | | | with rounded bottoms | the dent is more than the limits, you | | | | must remove the case and vane assembly| | ...................................................................
 |  Pits  | 0.010 inch (0.254 mm)  |  You must make the area smooth.  If  |
 |  | in depth, maximum  |  the damage is worse than the limits,  |
 |  |  |  you must remove the case and vane  |
 |  |  |  assembly.  |

 | ................................................................... | Cracks in | None are permitted | If there are cracks in the inner case,| | the Inner | | you must remove the case and vane | | Case | | assembly. | | ................................................................... | Cracks in | 1.000 inch (25.400 mm) | The engine can continue to operate | | the Outer | maximum circumferential| for 20 more hours, if the crack has | | Case | length | all 3 of the conditions that follow: | | | | 1) The crack is less than the limits. | | | 0.500 inch (12.700 mm) | 2) You correctly stop drill the crack | | | maximum axial length | with a 0.0625 inch (0.1581 mm) drill| | | | 3) The crack does not go into a flange | | | | or boss. | 2.............…........................…........................................1
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S 216-023-N00
 (2)  
See if the vane damage is local and isolated.

 (a)  
If the vane damage is not local and isolated, you must replace the vane immediately (AMM 72-33-02/801).

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

2.5 BLEED VALVE
FAN EXIT A INNER CASE
A
B  B 
FLANGE C 
FLANGE B 
FAN CASE  FLANGE B2  NUTS AND WASHERS 
FLANGE B1  FAN EXIT CASE AND  SEE  B  PW SB 72-262 ON ENGINES WITH 
SEE  A  VANE 
LOCKWIRE 
A-A 

2 1 WITHOUT PW SB 72-262 PARTIAL INCORPORATION OF PW SB 72-262 PERMITTED LOCKWIRE PATTERNS WITH PERMITTED LOCKWIRE PATTERN FOR ENGINES  B-B  1  B  B-B  2 
Figure 601 (Sheet 1) Fan Exit Case Inspection 

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0.150 INCH
(3.810 mm) INITIAL DIMENSION
DAMAGE
　
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