High-Pressure Turbine Blade (Only Applicable NON /P Engines)
Figure 608/TASK 72-52-00-991-303
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(a) To turn the core manually with a breaker bar, do the steps that follow:
1 Remove the handcranking drive cover from the core rotation pad
_ on the left side of the accessory gearbox (AGB), opposite the starter (Ref. TASK 72-63-00-000-002).
2 Install a 0.75 in. square drive socket with a 2ft. long
_ breaker bar into the handcranking drive pad. When you do the borescope inspection, turn the core engine clockwise (CW, aft looking forward).
NOTE : To turn the core engine CW, the handcranking drive must
____ be turned counterclockwise (CCW).
(b) To turn the core with a drive motor, do the steps that follow: 1 Remove the starter (Ref. TASK 80-11-10-000-002).
_ 2 Install the MOTOR, DRIVE - CORE ENGINE ROTATION (856A1488 P01
_ or P02) into the accessory gearbox (AGB) starter drive pad. Align the drive shaft of the drive motor with the starter drive pad drive shaft and engage the splines.
NOTE : The tool must be installed in the horizontal position
____ with the air hoses to the rear.
3 Turn the tool until the captive bolts align with the gearbox
_
bolt holes.
4 Tighten the two captive bolts by hand.
_
5 Install the clamp to secure the drive motor.
_
6 Attach the foot or hand control air hoses to the quick
_
disconnects on the tool.
7 Connect the air supply to the drive motor. The air supply must
_ be capable of 100 psi (6.9 bar). The air supply must be lubricated and filtered at 6 SCFM (170 L/minute).
(3) Remove either one of the spark igniters (Ref. TASK 74-21-30-000-002).
(4) Install the protective caps on the lead and the spark igniter.
(5) Put the KIT, BORESCOPE GUIDE - HP TURBINE (856A1310G01) over the straightening rod.
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(6) Push the plastic guide tube and straightening rod into the combustion chamber through the spark igniter port (S10 or S11) as far as it will go.
(7) Turn the pointed tab on the plastic guide tube to the rear of the engine and remove the straightening rod from the plastic guide tube.
(8) Installation of the borescope:
CAUTION : FOLLOW THE INSTRUCTIONS CAREFULLY FOR INSERTING OR REMOVING
_______ THE FLEXIBLE BORESCOPE. DOING THE PROCEDURE INCORRECTLY WILL DAMAGE THE TIP CONTROL FUNCTION.
(a) Connect the fiber light cable to the FIBERSCOPE SET (856A1321 P01 or P03) to the BORESCOPE - LIGHT SOURCE SET (856A1322 P03, P04 or P07).
(b) Align the borescope lens with one of the plastic tabs on the guide tube and install it into the tube. Make sure that the borescope tip is not moved up or down when putting it into the plastic guide tube.
(c) Push the borescope through the plastic guide tube until the tip comes out of the end of the tube.
(d) Push the tip of the borescope between the nozzle vanes by using the tip deflection control.
(e) Turn on the light source of the BORESCOPE - LIGHT SOURCE SET (856A1322 P03 or P04).
(f) Adjust the borescope equipment to get maximum clarity of view.
(9) Turn the HPT rotor CW (aft looking forward). Stop the rotor at each blade to make sure all of the defects can be seen.
NOTE : To turn the HPT rotor CW, the rotation pad drive must be
____
turned CCW.
(10) Inspect the HPT blades (from the front) and use the limits that follow:
NOTE : It is not easy to visually tell when cooling holes are
____ plugged. Cooling holes which are apparently plugged are permitted if any cracking, erosion or burning is within serviceable limits.
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NOTE : Crack indications which are not completely identified may be
____ sprayed with solvent (CP2011) or an equivalent substitute to remove light engine deposits.
NOTE : When a HPT blade has impact damage, you must do a 360 degree
____ combustor borescope inspection to look for combustor distress (Ref. TASK 72-42-00-290-005).
NOTE : For purposes of estimating the size of any distress, the
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