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Maximum length must be less than 3 times the outside diameter of the duct. Contour change must be less than 20 percent of the outside diameter of the duct.
If the damage is more thanthe allowable limits,replace the duct (Ref. TASK 30-21-49-000-046) and (Ref. TASK 30-21-49-400-046).
If the dents are less thanthe allowable limits,repair the dents (Ref. CFMI ESM 72-09-03). If the dents are more than the allowable limits, replace the duct (Ref. TASK 30-21-49-000-046) and (Ref. TASK30-21-49-400-046).
If the flat areas are lessthan the allowable limits, repair them (Ref. CFMI ESM 71-09-03). If the flat areas are more than the allowable limits, replacethe duct (Ref. TASK 30-21-49-000-046) and (Ref. TASK 30-21-49-400-046).

 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
R R R R  D. Nicks, scratches, chafing in straight section.  Maximum depth must be less than 10 percent of the wall thickness of the duct. There is no limit to the number of nicks, scratches or chafing allowed in the straight section of the duct.  If the damage is less thanthe allowable limits,repair the damage (Ref. CFMI ESM 72-09-03). If the damage is more than the allowable limits, replace the duct (Ref. TASK 30-21-49-000-046) and (Ref. TASK30-21-49-400-046).
R R R R  E. Nicks, scratches, chafing in bends.  Maximum depth must be less than 10 percent of the wall thickness of the duct.  If the damage is less thanthe allowable limits,repair the damage (Ref. CFMI ESM 72-09-03). If the damage is more than the allowable limits, replace the duct (Ref. TASK 30-21-49-000-040) and (Ref. TASK 30-21-49-400-040).
 F. Splits, cracks,  Maximun length must be less than the duct  If the damage is less thanthe duct OD do the weld
R  kinks  outside diameter.  repair (Ref. CFMI ESM 72-09-03 Repair No. 3).
 Maximun length same as or more than the duct  If the damage is the sameas or more than the duct
 outside diameter.  OD do the doubler and 
R R R  section repair (Ref. CFMI ESM 72-09-03 Repair No. 4).

 

 5. Close-up
________ Subtask 30-21-49-410-096
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close the fan cowl doors (Ref. TASK 71-13-00-410-040):
 FOR 1000EM1
 437AL 438AR
 FOR 1000EM2
 447AL 448AR

 (3)
 Remove the access platform(s).

 (4) Remove the warning notice(s). Subtask 30-21-49-865-078
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1DN1, 1DN2

 VALVE - ENGINE AIR INTAKE ANTI ICE (4000DN) - REMOVAL/INSTALLATION__________________________________________________________________
 TASK 30-21-51-000-041
 Removal of the Engine Air Intake Anti-ice Valve (4000DN)
 1. Reason for the Job__________________
 NOTE : The removal of the air intake anti-ice valve is the same for the____ engine 1 and the engine 2.
 2. Job Set-up Information______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific No specific No specific No specific  blanking plugscircuit breaker(s) safety clip(s)protective coverswarning notice
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R  24-42-00-861-001 71-13-00-010-040 30-21-51-991-300  Energize the Ground Service Network from the External PowerOpening of the Fan Cowl DoorsFig. 401
 3. Job Set-up__________ 
R  Subtask 30-21-51-861-059 
R R  A. Energize the ground service network (Ref. TASK 24-42-00-861-001).
 Subtask 30-21-51-941-051 
R  B. 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).

　
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