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_________ Subtask 72-54-00-210-057
 A. Inspect cooling air tubes and manifolds as follows:
 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Cooling air manifold for: (Ref. Fig. 605/TASK 72-54-00-991-304)
 A. Cracks in the forward mounting lug
 B. Broken forward mounting lug
C. Dents One crack on each sideis permitted
One breakage on one sideof a lug is permitted
 One breakage on each side of a forward lug is permitted according the two adjacent support tube : are not broken or crack is not longer than 0.59 in. (15 mm) on the mounting lugs.
Any number if smooth contour and not deeper than 0.03 in. (0.76 mm).
A continue in-servicelimit of 10 hours or 10cycles is permitted if oneadjacent support tube isbroken.If one or two adjacenttubes have a crack that ismore than 0.59 in. (15mm), check the part for crack evolution after 10 hours or 10 cycles -If no crack evolution: Check after 50 hours or 50 cycles following the first check, then check every 100 hours or 100 cycles -If crack evolution : A continue in-service limit of 30 hours or 30 cycles is permitted
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 Visual Inspection of the Mounting Lugs (Only Applicable /P Engines)

 Figure 605/TASK 72-54-00-991-304- 12 (SHEET 1)
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 Visual Inspection of the Mounting Lugs (Only Applicable /P Engines)

 Figure 605/TASK 72-54-00-991-304- 22 (SHEET 2)
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 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
2. Cooling air tubes for:
 A. Cracks in tubes  Any numbers if not
 longer than 2 in. (50.8
 mm) and separated by at
 least one support
 member.

 B. Dents  Any number, if no more
 than 30 percent of tube
 outer diameter.

 C. Cracks in tube  Any number if tubes are
 clamps correctly attached.

 5. Close-up
________
 Subtask 72-54-00-410-093
 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 cowl doors (Ref. TASK 78-36-00-410-040): FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR

 Subtask 72-54-00-440-065
 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).

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 LPT SHAFT - DESCRIPTION AND OPERATION
_____________________________________
 1. General
_______
 (Ref. Fig. 001)

 A. Low pressure turbine shaft
 (1) The low pressure turbine (LPT) shaft module connects the fan shaft with the LPT rotor. It is composed of the LPT shaft, center vent tube and center vent tube rear extension duct. The aft end of the LPT shaft is supported by the No. 5 bearing ; its forward end is coupled with the fan shaft. The LPT shaft has 2 functions : coupling the fan/booster rotor with the LPT rotor and providing for high pressure turbine rear support through the No. 4 bearing. In addition, the LPT shaft houses the center vent tube of the forward and aft engine sumps.
　
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