(b)
Insert the guide tool into the combustor through the RH igniter plug mounting boss.
(c)
Insert the flexible borescope through the guide tool.
(d)
Inspect the combustor exhaust area as far as possible.
(e)
Insert the guide tool into the combustor through the LH igniter plug mounting boss, repeat steps (3) and (4).
(f)
Inspect the combuster liner as far as possible using the rigid borescope through the LH and RH igniter plug mount bosses. Further detailed inspections provide on removed Combustion Chamber Assembly ref. APIC EM 49-21-10.
(g)
If there are cracks, holes, erosion, distortion or burns replace the APU. (Ref. TASK 49-11-11-000-003)
(4)
Inspect the 1st Stage Turbine (leading edge).
(a)
Use a flexible/fibrescope borescope 5mm dia. with guide tool and borescope battery.
(b)
Insert the TOOL FOR ENDOSCOPIC INSPECTION into the combustor through the LH igniter plug mounting boss.
(c)
Insert the flexible borescope through the TOOL FOR ENDOSCOPIC INSPECTION.
(d)
Inspect the Nozzle Guide Vanes:
-no holes across the vanes.
-erosion and cracks permitted.
-broken blades leading edge are not permitted.
-Cracks on the Trailing Edge as per limit given are permitted.
(e)
Inspect the 1st stage turbine blades while slowly rotating the rotor using a suitable ratchet handle, extension and socket on the cooling fan center shaft retaining nut.
(f)
If there are bent, cracked or broken blades, replace the APU. (Ref. TASK 49-11-11-000-003) Impact, erosion and burning is permitted in the hatched areas. No damage is permitted in the platform/airfoil link radius.
(5)
Inspect the 2nd Stage Turbine Blade (trailing edge).
(a)
Use the rigid boroscope-8mm dia.
(b)
Insert the rigid borescope through the thermocouple mount boss.
(c)
Inspect the 2nd stage turbine blades while slowly rotating the rotor using a suitable ratchet handle, extension and socket on the cooling fan center shaft retaining nut.
(d)
If there are eroded, bent, cracked or broken blades, replace the APU. (Ref. TASK 49-11-11-000-003)
Subtask 49-20-00-420-053
C.
Installation
(1)
Install the two igniter plugs (Ref. TASK 49-41-41-400-002).
(2)
Install the LH thermocouple (Ref. TASK 49-72-15-400-002).
(3)
Install the cooling fan inlet duct (Ref. TASK 49-52-53-400-001) para.
4. B.(14).
5.
Close-up
________ Subtask 49-20-00-410-061
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Set the LIGHT control switch 11LJ to the off position.
(3)
Close the APU access doors 315AL and 316AR (Ref. TASK 52-41-00-410-001).
(4)
Remove the access platform(s).
(5)
Remove the warning notice(s). Subtask 49-20-00-865-071
B.
Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.
Subtask 49-20-00-860-051
C. Aircraft Maintenance Configuration.
(1) De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
ENGINE ((131-9(A))) - INSPECTION/CHECK
______________________________________
TASK 49-20-00-200-003
APU Power Plant Boroscope Inspection (131-9(A))
WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______ WHEN YOU DO THE MAINTENANCE TASK(S).
WARNING : DISCONNECT THE LOW TENSION ELECTRICAL SUPPLY 5 MINUTES BEFORE YOU
_______ START WORK ON THE IGNITION SYSTEM. ALSO, GROUND THE IGNITER LEAD WITH AN INSULATED DEVICE AS YOU DISCONNECT IT FROM THE IGNITER PLUG. HIGH CURRENT AND VOLTAGE, WHICH ARE USED IN THE IGNITION SYSTEM, CAN KILL YOU.
WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL MATERIALS
_______ ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
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