(b)
Insert a 1/4 inch hex socket, with attached 6 inch extension and ratchet wrench, onto the 1/4 inch hex shaft on the end of the starter.
NOTE : MAKE SURE THE APU INTERNAL TEMPERATURE IS NOT MORE THAN
____ 176F (80C) BEFORE THE BORESCOPE IS PUT INTO THE APU. HEAT CAN DAMAGE THE BORESCOPE.
(2)
Remove EGT thermocouple from the engine assembly. (Ref. TASK 49-72-15-000-002).
(3)
Put the borescope into the EGT thermocouple port.
(4)
Adjust the borescope as necessary to examine the second stage turbine rotorblades for damage.
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CES
(5) Turn the rotating group as necessary and examine the second stage turbine blades for the conditions that follow. (Ref. Fig. 614/TASK 49-20-00-991-028)
(a)
The following observations are acceptable:
(b)
The following observations are not acceptable, the observations are criterifor APU removal:
1_ Blade tip corrosion is permitted (48).
2_ Missing flow discouragers on leading or trailing edge of
turbine wheel is acceptable (51).
3_ Discoloration of blades is acceptable (50).
4_ Nicks on leading edge, trailing edge and blade tip is
acceptable (49).
1 Remove the APU if there are any cracked or missing blades
_ (52).
(6) If the condition of the turbine blade is suspect, a review of MES/IDLE report 13 accessed through the MCDU is possible. If EGTA is greater than 1100F (593C), remove the APU at earliest convenience.
NOTE : Second stage stator vanes are not accessible with borescope.
____ Assessment ofacceptance should be made based on condition of first stage turbine nozzle and fstage turbine wheel.
(7)
Remove the borescope from the EGT thermocouple port.
(8)
Install EGT thermocouple in the engine assembly (Ref. TASK 49-72-15-400-003).
(9)
Install cap on end of starter.
5. Close-up
________ Subtask 49-20-00-410-070
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Set the LIGHT SW 11LJ to the OFF position.
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CES
Second Stage Turbine-Blade Damage Criteria
Figure 614/TASK 49-20-00-991-028
CES
(3) Close the APU access doors 316AR, 315AL (Ref. TASK 52-41-00-410-001) .
(4)
Remove the access platform(s). Subtask 49-20-00-865-089
B.
Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.
Subtask 49-20-00-710-066
C. Test NOTE : Because components are disconnected or removed during boroscope
____ procedure,it is recommended to operate the APU in ECS mode to make sure correct APU operation.
(1)
Start the APU (Ref. TASK 49-00-00-860-008).
(2)
Operate the APU for at least 5 minutes in ECS mode.
(3)
Stop the APU (Ref. TASK 49-00-00-860-009).
(4)
Do an inspection of the APU for fuel, oil and air leaks (Ref. TASK 49-00-00-790-003).
NOTE : Leaks are not permitted.
____ Subtask 49-20-00-860-080
D. Aircraft Maintenance Configuration.
(1)
Pressurize the reservoirs of the hydraulic systems.
(Ref. TASK 29-14-00-614-002).
(2)
De-energize the ground service network
(Ref. TASK 24-42-00-862-001).
(3)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(4)
Remove the warning notice(s).
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CES ENGINE ((GTCP 36-300)) - CLEANING/PAINTING
__________________________________________
R **ON A/C 001-003, 051-099, 401-499,
TASK 49-20-00-100-001
APU Compressor Cleaning (GTCP 36-300)
WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______
WHEN YOU DO THE MAINTENANCE TASK(S).
1. Reason for the Job
__________________
High EGT as a result of compressor contamination.
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