(2)  
The replacement indicator does not operate during subsequent flights.

 (3)  
The indicator stays set during a ground run of the affected engine at 1.065 EPR (high idle). This gives the maximum regulated pressure in the duct.

 C.  This procedure has these tasks:
 (1)  
An inspection of the engine to Thermal Anti-ice (TAI) Ring Duct.

 (2)  
An inspection of the TAI Pressure Indicator.

 D.  Service Bulletins referred to:
 (1)  RR SB 71-9634 Nose Cowl - Introduction of Composite Acoustic Liner and Re-designed Thermal Anti-icing TAI System
 TASK 30-21-04-216-001
 2.  Inspection/Check - Engine to Thermal Anti-Ice (TAI) Ring Duct_____________________________________________________________
 A.  General
 (1)  
This procedure is done after the Engine to TAI Ring Duct is removed and has the steps for the inspection of the duct and the recommended acceptance standards which are necessary when you do the inspection.

 (2)  
The left and right Engine to TAI Ring Duct inspection procedures are given in this task.

 B.  Reference
 (1)  30-21-04/401, Engine to TAI Ring Duct
 C.  Access
 (1)  
Location Zones
 410 No. 1 power plant
 420 No. 2 power plant

 (2)  
Access Panels
 413 Fan cowl panel (Left)
 414 Fan cowl panel (Right)
 423 Fan cowl panel (Left)
 424 Fan cowl panel (Right)

 D.  Procedure
 S 016-002
 (1)
Remove the engine to TAI ring duct components (AMM 30-21-04/401).

 S 216-003

 (2)  
Inspect the duct assembly and shroud assembly for cracks, dents, nicks, galling, fretting, and damaged piston seals:

 (a)  Acceptance Standards
 1) Cracks - Reject.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. RB211-535E4 ENGINES WITH TAI DUCT BURST ú

 30-21-04
 (POP-OUT) INDICATOR (LEFT SIDE OF INLET  ú
 COWL)  ú 01 Page 601 ú May 28/99

A

757 MAINTENANCE MANUAL
 2)  Smooth dents with a large outer diameter can be accepted if: a) No metal has been removed b) The indentation is smooth and does not end in a sharp
 point. c) The dent does not decrease the diameter by more than
 6.35 mm (0.250 inches). 3) Smooth dents with a small outer diameter can be accepted if
　
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