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 4. Procedure
_________
 (Ref. Fig. 601/TASK 78-11-11-991-300)
 Subtask 78-11-11-210-050
 A. Visual Inspection of the Core nozzle
 (1) Do a visual inspection of the core nozzle assembly as follows. Use proper lighting to illuminate the inner and outer skins:
 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Inner skin for:
R NOTE : It is permitted to have polish marks on the inner skin surface.
____
 A. Crack  1 in. (25.4 mm) maximum length  Stop-drill ends with0.0625 in. (1.59 mm) drill. Monitor at "A"
 check. For permanent repair (Ref. CMM 781105)
 6 in. (152.4 mm) maximum total of all cracks
 4 in. (101.6 mm) minimun separation from other cracks
 2. Outer skin for:
 A. Crack  0.25 in. (6.35 mm) maximum length  Stop-drill ends with 0.125in. (3.17 mm) drill. Monitor at "A" check. For
 permanent repair (Ref. CMM 781105)
 2 in. (50.8 mm) maximum total of all cracks
 2 in. (50.8 mm) minimum separation from other cracks

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 Core Exhaust Nozzle
 Figure 601/TASK 78-11-11-991-300

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3. Forward bulkhead for:
 A. Crack
B. Gouge or scratch
4. Pylon seals for:
 A. Wear
5. Inner and outer skins for:
No crack permitted in the forward 17 in. (0.43 mm) segment
No crack permitted
0.010
 in. (0.25 mm) maximum depth

1.5 in. (38.09 mm) maximum lenght

Parts worn through the outer seal that show wear damage to the inner seal Replace exhaust nozzle(Ref. TASK 78-11-11-000-041) and (Ref. TASK 78-11-11-400-041).
Replace exhaust nozzle (Ref. TASK 78-11-11-000-041) and (Ref. TASK 78-11-11-400-041).
Monitor at "A" check. Forpermanent repair (Ref. CMM 781105).
Replace exhaust nozzle(Ref. TASK 78-11-11-000-041) and (Ref. TASK 78-11-11-400-041).
R NOTE : It is permitted to have polish marks on the inner skin surface.
____
 A. Dent  2.50 in. (63.5 mm) maximum diameter  OK for flight. Make smooththe contour at next shop visit
 0.25 in. (6.35 mm) maximum depth
 0.25 in. (6.35 mm) minimum radius

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B. Gouge or scratch

C. Missing or damaged rivets
5. Close-up
________ Subtask 78-11-11-410-066
 A. Close Access
0.010
 in. (0.25 mm) maximum depth

1.5 in. (38.1 mm) maximum lenght

Maximum of 5 percents missing or damaged rivets . There must be at least one good rivet between any two that are missing or damaged.
Monitor at "A" check. Forpermanent repair (Ref. CMM 781105).
OK for flight. Replacerivets at next shop visit(Ref. CMM 781105).
 (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

 (3) Remove the access platform(s).

 Subtask 78-11-11-440-057
 B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041).
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 C. Close Access
　
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