TM 55-1520-240-23-6 7-98 TEST PITCH, ROLL, YAW, OR THRUST INTEGRATED LOWER CONTROL ACTUATOR (ILCA) (AVIM)     (Continued) 7-98 NOTE Pitch, roll, and yaw ILCA are tested as spare ILCA. (SPARE) indicates test applies to spare ILCA only. (ALL) indicates test applies to spare and thrust ILCA. Thrust ILCA has no extensible link. After test set has been in operation, HIGH PRESS gauge and LOW PRESS gauge will not return to  0 psi. When shutoff and regulator valves are closed and relief valves are pressed, the HIGH PRESS gauge may read 20 to 35 psi.  The LOW PRESS gauge may read  25 to 60 psi. This is normal.  Preliminary procedures and the following tests are included: TEST 1. Ground Test 2. No.  1 Extensible Link Self Feedback Transducer Null Voltage Test (SPARE) 3. No.  2 Extensible Link Self Feedback Transducer Null Voltage Test (SPARE) 4. Extensible Link Cross Feedback Transducer Null Voltage Test (SPARE) 5. No.  1 and No.  2 Extensible Link Phase Test (SPARE) 6. Manual Cycling Test (ALL) 7. Cylinder Stroke Test (ALL) 8. Extensible Link Authority Test (SPARE) 9. Static Deadband Test (ALL) 10. Extensible Link Stability Test (SPARE) 11. Extensible Link Centering Springs Test (SPARE) 12. Proof Pressure Test (ALL) 13. Return Pressure Test (ALL) 14. Valve Jam Indicator Test (ALL) 15. Case Cavity Leakage Test (ALL) 16. Relief Valve Test (ALL) 17. External Dynamic Leakage Test (SPARE) 18. External Static Leakage Test (ALL) 19. Teardown Procedure 20. Centering Spring Test 21. Stability Test NOTE Check the Operating Instructions in TM 55-4920-428-13 to verify the ILCA Bench Test Set is prepared for use. TEST TABLE The test table is based on recognizable malfunctions and symptoms and is for reference only. MALFUNCTION SYMPTOMS TESTS Electrical a.  Bite Failure, 70 thru 71 and 80 thru 84 2, 3, 4, 5, 6, 8, 9, 10 SELF LVDT #1 b.  Engagement error SELF LVDT #2 c.  Chattering link SUM LVDT d.  Oscillations in Pitch, Roll, or Yaw Hydraulic Leakage Lower Boost Actuator Leakage 6, 11, 12, 14, 15, 16, 17 #1 or #2 Extensible Link Leakage 11, 12, 16, 17 Mechanical Jam Indicator will not extend 13 Lower Boost will not go through full travel 6, 7 7-404 Change 1