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  1.  
  2.  
  3. 2/12/20
  4.  
  5. No discrepancy.
  6.  
  7. Checked the engine inlet anti-icing system in accordance with maintenance manual. Engine inlet anti-icing system performing to expectation. Checked the engine inlet anti-icing system without engine operating. Performing to expectation.
  8.  
  9. TESTING ENGINE INLET ANTI-ICING SYSTEM WITHOUT ENGINE OPERATING
  10.  
  11. Refer to T-39A and T-39B powerplant ground operation.
  12.  
  13. A. Disconnect electrical plug from anti-icing valve solenoid.
  14.  
  15. B. Remove bolts and locknuts securing duct to inlet and diffuse case. Remove duct and valve from engine.
  16.  
  17. C. Remove bolts securing valve to elbow and duct.
  18.  
  19. INSTALLING ENGINE INLET GUIDE VANE ANTI ICING VALVE.
  20.  
  21. A. Place gasket and spacer on rear flange of anti-icing valve and secure valve to duct with bolts. Torque bolts and lockwire.
  22.  
  23. B. Inset guide into valve. Secure guide and elbow on valve with bolts. Torque bolts and lock-wire.
  24.  
  25. C. Place gasket on rear flange of anti-icing duct. Position duct assembly on engine pads at inlet and diffuser cases.
  26.  
  27. D. Secure duct assembly with bolts and locknuts.
  28.  
  29. E. Connect electrical plug to anti-icing valve solenoid. Safety plug, using  AN995F32 lockwire.
  30.  
  31. TESTING ENGINE INLET ANTI-ICING SYSTEM WITH ENGINE OPERATING
  32.  
  33. A. Remove engine if engine is installed.
  34.  
  35. B. Disconnect two electrical plugs from valve assembly.
  36.  
  37. C. Disconnect deice pressure pressure sensing line "B" nut at valve assembly.
  38.  
  39. D. Remove eight bolts securing valve to duct assemblies.
  40.  
  41. E. Remove valve and gaskets.
  42.  
  43. INSTALLING ENGINE INLET DEICE VALVE
  44.  
  45. A. Position valve between ducts with arrow on valve pointing forward.
  46.  
  47. B. Insert gasket between aft valve flange and duct assembly. Install and tighten four bolts.
  48.  
  49. C. Insert gasket between forward valve flange and duct assembly. Install and tighten four bolts.
  50.  
  51. D. Connect deice pressure sensing line "B" nut to fitting on valve assembly, and torque to 135-185 inch-pounds.
  52.  
  53. E. Connect two electrical plugs to  valve assembly. Safety plugs, using AN995F32 lockwire.
  54.  
  55. A and P Pending.
  56.  
  57. Cannon Misenko
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