Forward Sump
Figure 005
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Aft Sump
Figure 006
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Sump Venting System
Figure 007
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E E Feb 01/98 E E ECES E 4. Engine Boroscope Inspection Port Provisions, Location and Identification
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________________________________________________________________________ (Ref. Fig. 008, 009, 010) There is a total of 22 borescope port provisions along the engine. The most important number of them is found on the engine right side, mostly between the 4 and 5 o'clock positions, aft looking forward. Their location and identification are as follows:
A. On the Inner Wall (Fairing) of the Fan Bypass Duct (Ref. Fig. 008) There are two (8 mm dia) borescope port provisions. From front to rear, the first port, identified S03, is just below the 3 o'clock position, between two OGVs. The second port, identified S05, is near the 4 o'clock position, just in front of the Variable Bleed Valves (VBVs) plane. Refer to ATA 72-21-00 for the internal parts and areas you can fully or partially see through these two borescope port provisions.
B. On the High Pressure Compressor (HPC) Front and Rear Casings (Ref. Fig. 009, 010) There are nine (8 and 10 mm dia) borescope port provisions, located between the 4 and 5 o'clock positions, aft looking forward. From the HPC inlet plane IGV to the last stage (ninth) of the HPC, they are identified as follows:
- S1, S2, S3, S4, S5, S6, S7, S8 and S9. Refer to ATA 72-31-00 for the internal parts and airfoil areas you can see through these 9 borescope port provisions.
C. On the Combustion Case
(Ref. Fig. 008, 009, 010)
There are six borescope port provisions around the combustion case:
- S12, S13, S14, S15, located in the same plane, at the 1, 3, 6 and 10 o'clock positions respectively, and immediately in front of the fuel manifold,
- S16 and S17, located in the same plane, at approximately the 5:30 and
8:30 o'clock positions respectively, and immediately in front of the combustion case aft flange. The two ports which install the two spark igniters on the combustion case can also be used as borescope port provisions. These ports are identified as S10 and S11. They are in the same plane, at the 4 and 8 o'clock positions respectively. The S10, S11, S12, S13, S14 and S15 ports permit the borescope inspection of the HPT rotor blades (S10 and S11), the combustion chamber and the HPT nozzle. The S16 and S17 ports permit the borescope inspection of the HPT shrouds, the stage 1 LPT nozzle segments and leading edge of stage 1 LPT rotor blades.
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Engine Borescope Port Provisions - Location and Identification on Left Side
Figure 008
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Engine Borescope Port Provisions - Location and Identification on Right Side
Figure 009
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Borescope Port Provisions - Location and Engine Station
Figure 010
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E E Feb 01/98 E E ECES E Refer to ATA 72-41-00, 72-42-00, 72-51-00, 72-52-00 and 72-53-00 for the internal parts and the areas you can, fully or partially, see through the six normal borescope port provisions of the combustion case and the two spark igniter ports.
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NOTE : The use of the spark igniter ports as borescope provisions (S10
____ and S11) necessitates the removal of the spark igniters (Refer to ATA 74-21-30).
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