(a) Put a warning notice to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
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(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
Subtask 72-51-00-010-053
B. Get Access
(1) Open the fan cowls doors: (Ref. TASK 71-13-00-010-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR.
(2) Put the access platform in position.
Subtask 72-51-00-040-051
C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
Subtask 72-51-00-010-054
D. Open the thrust reverser cowl doors (Ref. TASK 78-36-00-010-040): FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR.
4. Procedure
_________
(Ref. Fig. 601/TASK 72-51-00-991-300, 602/TASK 72-51-00-991-301)
Subtask 72-51-00-010-056
A. Remove parts before borescope inspection.
(1) Remove the borescope plugs from the approximate 3 and 10 o'clock positions on the combustion case.
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Inspection of the High-Pressure Turbine-Nozzle Assembly
Figure 601/TASK 72-51-00-991-300
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HPT Nozzle Assembly Inspection, Convex Side
Figure 602/TASK 72-51-00-991-301
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B. Do a Borescope Inspection
(1) Connect the fiber light cable to the BORESCOPE KIT (856A1320 P04 or P05), and to the port on BORESCOPE - LIGHT SOURCE SET (856A1322 P02 or P03 or P04 or P07 or P08).
NOTE : Use the MONITOR, RESOLUTION BORESCOPE (856A1323G01) to make
____ sure the borescope or the fiberscope and the light source are serviceable. See the Non-Destructive Test Manual for this procedure (Ref. NDTM 720000).
(2) Put the rigid borescope, of the BORESCOPE KIT (856A1320/P04 or P05), into the ports and turn on the light source BORESCOPE - LIGHT SOURCE SET (856A1322/PO3 or PO4).
(3) Rotate and adjust the borescope to view the HPT nozzle area.
(4) If inspection of the nozzle convex side is necessary, use a FIBERSCOPE SET (856A1321 P01 or P03) and KIT, BORESCOPE GUIDE - HP TURBINE (856A1310G01), or GUIDE TUBE ,BORESCOPE - HPT SHROUD (856A1351P01).
NOTE : If KIT, BORESCOPE GUIDE - HP TURBINE (856A1310) is used to
____ view the convex side, an 8 ft. (2.43 m) fiberscope must be used.
(5) Inspect the following:
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Leading edge of vane airfoil for:
A. Cracks that Any number, 0.3 in. See limit extension interconnect nose (7.62 mm) long ; no (Ref. TASK 72-00-00-200-holes. missing material. 025).
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-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
B. Burns or spalling.
R C. Baffle.
Any amount, burns through airfoil limited to 0.3 in. (7.62 mm) X
0.5 in. (12.7 mm) per vane, maximum of 4 vanes per 90 degree arc.
See limit extensions(Ref. TASK 72-00-00-200-025).
R NOTE : The airfoil's baffle is visible inside the airfoil when missing
____ R material occurs. It is sheet metal with cooling holes.
R (1) Cracks. Any number.
R R R (2) Missing material. Any area equivalent to a rectangle defined by 4 adjacent holes.
2. Concave surface of vane airfoil for:
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