74-21-20Page 608
Aug 01/01

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 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
R
R 5. Type 3 and 4 cooling R shroud for :
R - Obstruction at exit holes.
R 6. Type 3 and 4 ignition R lead chafe guard for
R :
R
R - Cuts and/or tears.

R R Subtask 74-21-20-420-059
Not serviceable.  Remove the obstruction.
Not serviceable.  Repair lead (Ref. TASK 74-
21-20-300-006). 

R D. Connect the left ignition lead connection (Ref. TASK 74-21-20-400-002).
 5. Close-up
________
 Subtask 74-21-20-410-055
 A. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.

 (2) Close the thrust reverser doors: (Ref. TASK 78-36-00-410-040) FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR

 Subtask 74-21-20-440-052
 B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041).
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 C. Close Access
 (1) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR

 (2) Remove the warning notice(s).

 Subtask 74-21-20-865-059
 D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1JH FOR 1000EM1 2JH1, 3JH1 FOR 1000EM2 2JH2, 3JH2
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 IGNITION LEAD (LEFT) - REPAIRS

______________________________
 TASK 74-21-20-300-004
 Repair of the Burned or Pitted Igniter Contact
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific lint-free cloth No specific CRATEX polishing block P/N3802 extra fine grade No specific Unison Industries contact polishing tool (optional)
 P/N 11-10786-1
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No.  CP1008 
R R  Material No. Material No.  CP1039 CP2011 
R R R R R R R R R R  Material No. Material No. Material No. Material No. Material No.  CP2559 CP2560 CP2566 CP2584 CP2656 

*
 trichloroethylene (Ref. 70-30-00)
*
acetone (Ref. 70-30-00)
*
 stoddard solvent (Ref. 70-30-00)
*
ardrox 552 (Ref. 70-30-00)
*
turco ind 79 (Ref. 70-30-00)
*
mag-chem teksol (Ref. 70-30-00)
*
degreasol 99 R (Ref. 70-30-00)
*
mag-chem skysol (Ref. 70-30-00)

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 C. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
74-21-20-000-002 Removal of the Left Ignition Lead 74-21-20-400-002 Installation of the Left Ignition Lead 74-21-20-991-303 Fig. 801
 3. Job Set-up
__________
 Subtask 74-21-20-020-055
 A. Remove the ignition lead (Ref. TASK 74-21-20-000-002).
 4. Procedure
_________
 (Ref. Fig. 801/TASK 74-21-20-991-303)
 Subtask 74-21-20-350-054
 A. Removal of Burns and Pits
 (1) Hold the end of the ignition lead firmly by hand. Clean the carbon deposits from the metal contact with CRATEX polishing block P/N3802 extra fine grade or Unison Industries contact polishing tool (optional) P/N 11-10786-1. Apply light pressure in a circular motion and keep the polishing block parallel to the contact surface.
　
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