3. Job Set-up
__________
 Subtask 72-23-00-941-099

 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 72-23-00-010-125
 B. Get Access
 (1) Put an access platform in position.

 (2) Remove the spinner front cone (Ref. TASK 72-21-00-000-005).

 (3) Remove the spinner rear cone (Ref. TASK 72-21-00-000-006)

 (4) Remove a sufficient number of fan blades to get access to the repair area (Ref. TASK 72-21-00-000-007).

R (5) Remove the forward acoustical panel (Ref. TASK 72-23-00-000-009).
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 4. Procedure
_________
 (Ref. Fig. 805/TASK 72-23-00-991-319)
 Subtask 72-23-00-350-062

 A. Replacement of the Riveted Self-Locking Nuts
 (Ref. Fig. 806/TASK 72-23-00-991-322)

 NOTE : If necessary, for the repair size rivets, drill at the same time
____ the rivet holes in the new nut you install and the rivet holes on the containment case (Ref. SPM 70-43-11-390003) or (Ref. SPM 70-43-31-390005).
 (1) Remove the rivet head with a 0.094 in. (2,4 mm) diameter drill (Ref. SPM 70-44-50-320006).

 (2) If you cannot remove the rivet head, use a 0.125 in. (3,2 mm) diameter drill related to the repair size rivet (Ref. SPM 70-43-31-390005) or (Ref. SPM 70-44-50-320006).

R (3) Do a check of the rivet holes (Ref. SPM 70-43-31-390005).
 (4) Install the new self-locking nuts (40) or (50) or (60) on the containment case with new rivets (10) or (20) or (30) (Ref. SPM 70-43-31-390005).
 5. Close-up
________
 Subtask 72-23-00-410-117

 A. Close Access R (1) Install the forward acoustical panel (Ref. TASK 72-23-00-400-009). R (2) Install the fan blades (Ref. TASK 72-23-00-400-028).
 (3) Install the spinner rear cone (Ref. TASK 72-21-00-400-006).

 (4) Install the spinner front cone (Ref. TASK 72-21-00-400-005).

 (5) Make sure that the work area is clean and clear of tool(s) and other items.

 (6) Remove the access platform(s).

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R R  Replacement of the Self Locking Nuts Figure 805/TASK 72-23-00-991-319
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R Dimensional Information for the Replacement of the Self Locking Nuts

R  Figure 806/TASK 72-23-00-991-322- 13 (SHEET 1)
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R Dimensional Information for the Replacement of the Self Locking Nuts

R  Figure 806/TASK 72-23-00-991-322- 23 (SHEET 2)
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R Dimensional Information for the Replacement of the Self Locking Nuts

R  Figure 806/TASK 72-23-00-991-322- 33 (SHEET 3)
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R (7) Remove the warning notice(s).

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 HP COMPRESSOR SECTION - DESCRIPTION AND OPERATION
_________________________________________________
 1. General
_______ (Ref. Fig. 001) The major components of the compressor are : compressor rotor and compressor stator. The front of the compressor stator is supported by the fan frame and the front of the compressor rotor is supported by the No.3 bearing in the fan frame. The rear of the compressor stator is attached to the combustion case and the rear of the compressor rotor is attached to the HPT rotor to form the core rotor. The rear of the core rotor is supported by the No.4 bearing. A portion of the fan discharge airflow passes thru the booster to the compressor. Compression is progressive as the primary airflow moves from stage through the axial compressor. Air passes through successive stages of compressor rotor blades and compressor stator vanes, being compressed as it passes from stage to stage. After passing through 9 stages of blades, the air has been compressed. The inlet guide vanes and the first 3 stages of the stator are variable, and change their angular position as a function of compressor inlet temperature and engine speed. The purpose of this variability is to optimize efficiency and stall margin for engine speed, compressor inlet temperature and pressure conditions.
　
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