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__________ Subtask 72-21-00-941-079
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(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.
(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 72-21-00-010-059
B. Get Access
(1) Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(2) Put the access platform in position. Subtask 72-21-00-040-052
C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041). Subtask 72-21-00-010-060
D. Open the thrust reverser doors: (Ref. TASK 78-36-00-010-040)
FOR 1000EM1
451AL, 452AR
FOR 1000EM2
461AL, 462AR
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4. Procedure
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(Ref. Fig. 601/TASK 72-21-00-991-307, 602/TASK 72-21-00-991-308, 603/TASK 72-21-00-991-309, 604/TASK 72-21-00-991-310, 605/TASK 72-21-00-991-313)
Subtask 72-21-00-290-053
A. Borescope Inspection Methods
(1) Inspection of booster rotor blades through the borescope ports SO3 and SO5 and booster inlet.
(a) There are 2 borescope ports (SO3 and SO5) located (approximately) at the 3.30 o'clock position at the periphery of the booster section and almost radially in line with the stages 3 and 4 of the booster stator. Through these ports, you can see the leading and trailing edges of the booster stage 3, 4 and 5 rotor blades. Through the booster inlet, you can get a borescope view of the booster rotor blades, stage 2.
(b) To do the inspection of the booster stages 2, 3, 4 and 5 rotor blades:
1 Use BORESCOPE KIT (856A1320P04/P05) (field of view 60 deg.,
_ angle of vision 90 deg.) with a long right angle extension.
2 Use BORESCOPE - LIGHT SOURCE SET (856A1322P02/P03/P04/P07/P08)
_ NOTE : It is necessary to index and turn the fan rotor. You
____ can turn the fan and booster rotor assembly by hand from the engine inlet.
Subtask 72-21-00-480-060
B. Installation of the borescope.
CAUTION : MAKE SURE THAT THE INPUT VOLTAGE OF THE BORESCOPE LIGHT SOURCE
_______
SET CORRESPONDS TO THAT OF THE POWER SUPPLY.
CAUTION : MAKE SURE THAT :
_______ THE ON-OFF SWITCH IS IN THE OFF POSITION. THE LIGHT INTENSITY CONTROL IS SET TO THE MINIMUM BEFORE YOU CONNECT THE BOROSCOPE LIGHT-SOURCE SET TO THE POWER SUPPLY. MAKE SURE THAT THE LIGHT SOURCE AND THE POWER SUPPLY ARE CORRECTLY GROUNDED.
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Booster Borescope Ports Figure 601/TASK 72-21-00-991-307
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Borescope Inspection of the Stage 2 Booster Blades Figure 602/TASK 72-21-00-991-308
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Borescope Inspection of the Stage 3 and 4 Booster Blades
Figure 603/TASK 72-21-00-991-309
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