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 are permitted. 3) Trailing edge cracks less than one quarter of the vane chord are permitted. 4) Cracks in a vane that can cause a piece of the vane to break off are not permitted.
 5)  Erosion or corrosion in the leading or the trailing edge of a vane, larger than 10 percent of the van chord, is not permitted.
 (l)  
When you complete the inspection, carefully remove the borescope and the guide tube.

 (m)  
Install the borescope inspection cover on the exhaust duct with the two bolts. 1) Tighten the bolts to 36-40 pound-inches (4.0-4.5 N.m).

 (n)  
Install a new packing, lubricated with engine oil, on the crank cover.

 (o)  
Install the crank cover on the front of load gearbox housing with the two washers and the bolts (Fig. 601). 1) Tighten the bolts 36-40 pound-inches (4.0-4.5 N.m).

 S 296-013
 (9)  Do the borescope inspection of the combustion chamber lining (Fig. 607):
 CAUTION:_______BE VERY CAREFUL WITH THE BORESCOPE DEVICE. THIS DEVICE CAN BE EASILY DAMAGED. DO NOT TWIST OR HOLD THE DEVICE TIGHTLY. DO NOT LET THE BORESCOPE DEVICE FALL TO THE GROUND. DAMAGE TO THE BORESCOPE CAN OCCUR.
 CAUTION: MAKE SURE THE ACTUATOR LEVER FOR THE DISTAL TIP IS IN THE
_______ NEUTRAL POSITION WHEN YOU INSTALL OR REMOVE THE BORESCOPE. THIS WILL PERMIT THE TIP TO MOVE FREELY.
 CAUTION: MAKE SURE YOU LET 40 MINUTES GO BY AFTER AN ENGINE
_______ SHUTDOWN BEFORE YOU DO THE INSPECTION. DAMAGE TO THE BORESCOPE CAN OCCUR IF THE APU IS TOO HOT.
 (a)  Remove one igniter plug (Ref 49-41-04/401).
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SEE A
BORESCOPE 
INSPECTION 
ZONE
SEE  B  PERMITTED 
CRACK CONDITION 

CRACK CONDITIONS CRACK CONDITIONS
A
NOT PERMITTED NOT PERMITTED
Conbustion Chamber Borescope Inspection
Figure 607 (Sheet 1)

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FUEL NOZZLEF
D

LEGEND 
F = BUTT WELD D = SEAM WELD C = IGNITER BOSS B = COOLING RING A = COMBUSTION DOME E = LINER WALL
C31377 
Figure 607 (Sheet 2) Conbustion Chamber Borescope Inspection 

B50273
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 (b)

(c)

(d)

(e)

(f)

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747-400 MAINTENANCE MANUAL
Put the end of the borescope through the igniter boss into the
 combustion chamber.
Move the end of the borescope until the fuel nozzle is visible.
Examine all of the fuel nozzles.
 1) Do a visual check for collected carbon particles.
 2) Do a visual check for stress due to high temperatures.
 3) Make sure the nozzles are not clogged.
If there are any of the above conditions; replace all of the
 fuel nozzles (Ref 49-31-04/401).
Do an inspection of the combustion chamber lining.
 1) Examine the combustion dome for buckling (View B, Item A.,

 Fig. 607). a) Local buckling that does not have a large depth is permitted. b) Buckling with a sudden change of the contour (kinks) is not permitted.
 2)  Examine the combustion dome for burned areas (View B., Item A., Fig. 607). a) Burned walls that cause a reduction in wall thickness
 are not premitted.
 3)  Examine the combustion dome for cracks (View B., Item A., Fig. 607). a) No cracks are permitted
 4)  Look for burned through holes in the combustion dome (View B., Item A., Fig. 607). a) Burned through holes in the combustion dome are not
　
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