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LOUVER IDENTIFICATION NUMBERS  DIM A 1  2  3  4  5  6  7  8  RADIAL 
12 O'CLOCK POSITION INJECTOR FUEL  22 23 24  330` 360`  DIM C = DIM B = DIM A =  1.10 INCHES REF (30.988 mm) 1.22 INCHES REF (30.988 mm) 1.22 INCHES REF 
LOCATIONS (24 LOCATIONS)  20 21  300`  (27.940 mm) 
19 18  270` 
17  240` 
16 
14 15  210` 
POSITION 6 O'CLOCK  12 13  180` 
10 11  150`  FWD 
9  120` 
8 
6 7  90` 
4 5  60` 
2 3  30` 
12 O'CLOCK POSITION  1  CLOCKWISE 0` 
FROM REAR 
PLANVIEW - COMBUSTION CHAMBER 
INTERNAL SURFACE  L-A3331 
(0597) 

Inner Combustion Chamber
Figure 617

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
12 O'CLOCK POSITION

OUTER DIAMETER  BULKHEAD SURFACE
VIEW IN THE FORWARD DIRECTION
L-A3334
Outer Burner Liner Bulkhead and Fuel Injectors
Figure 618

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
No. 16 - Combustion Chamber Inspection
______________________________________
 S 296-194-N00
 WARNING: DO NOT USE THE POWER CABLE OF THE BORESCOPE IF YOU FIND
_______ CIRCUMFERENTIAL CUT HOLES, FRAYING OR BROKEN HOLES IN THE EXTERNAL RUBBER COVERING ON THE CABLE. POWER CABLES WITH THOSE CONDITIONS CAN CAUSE INJURY TO PERSONS.
 CAUTION: MAKE SURE THE TEMPERATURE OF THE INSPECTION AREAS ARE BELOW
_______ 150°F (65.6°C) BEFORE YOU USE THE BORESCOPE. IF THE CASES ADJACENT TO THE INSPECTION AREAS ARE TOO HOT TO KEEP YOUR HAND ON, YOU CAN CAUSE DAMAGE TO THE BORESCOPE.
 (3)  Put the borescope through each access port to examine the condition of the combustion chamber.
 NOTE: The borescope goes into the combustion chamber through the
____
 dilution air holes.

 S 296-195-N00
 (4)  Compare the damage as identified in Figure 619 and Figure 620 with the continue-in-service limits shown in Table 606 and Table 607.
 NOTE: The frequency of the regular time inspection that is referred
____ to in the tables is from our Maintenance Planning Document. The frequency of the decreased time inspection is two times the frequency of the regular time inspection. In other words, the interval between decreased time inspections is half the interval of regular time inspections.
 NOTE: The maximum limits for the regular time and decreased time
____
 inspections were calculated to have the qualities that
 follow:

 During usual conditions of operation, permitted damage will not become unsatisfactory before the time for the subsequent applicable inspection.
 Usually, higher damage limits are permitted for the decreased time inspection because that inspection is done more frequently.
 Damage and deterioration in some areas change the performance of the engine very quickly, which makes a higher limit (for the decreased time inspection) not possible. For damage in these areas, the limits for the decreased and regular time inspections are the same.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
CONTINUOUS AXIAL CRACKS, DO AN OD (COLD SIDE)
INSPECTION. IF YOU CAN NOT DO AN OD INSPECTION,
　
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