A320 Trouble Shooting Manual 排故手册 大气 AIR(67)

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 - remove all the flexible shafts (Ref. AMM TASK 75-31-30-000-001).
R 1_  Inspect the rod ends of each flexible shaft (Ref. AMM TASK 75-
R  31-30-200-002). Replace any flexible shaft exhibiting excessive wear (Ref. AMM TASK 75-31-30-000-001) and (Ref. AMM TASK 75-31-30-400-001). In case of wear on the flexible shafts ends, all VBV doors must be inspected and manually operated. If nothing is found: - operate each of the 11 VBV actuator both directions and make
 sure that each moves smoothly and freely.
 NOTE : During this check, apply a manual load tending to force
____ the door towards its open position. Replace any suspect VBV ballscrew actuator (Ref. AMM TASK 75-31-60-000-002) and (Ref. AMM TASK 75-31-60-400-002).
 2 Remove the VBV gear motor/stop mechanism assembly (Ref. AMM
_
 TASK 75-31-10-000-002).

 a Check for free rotation of the VBV gear motor. If it does
_ not move freely replace the VBV gear motor (Ref. AMM TASK 75-31-10-000-002) and (Ref. AMM TASK 75-31-10-400-002).
 b Check for free rotation of the stop mechanism. If it does
_ not move freely replace the VBV stop mechanism (Ref. AMM TASK 75-31-20-000-002) and (Ref. AMM TASK 75-31-20-400-002).
 c Check for free rotation of the VBV master door actuator. If
_ it does not move freely replace the VBV master door actuator (Ref. AMM TASK 75-31-50-000-002) and (Ref. AMM TASK 75-31-50-400-002).
R 3_  Inspect the rod ends of the main flexible shaft (Ref. AMM TASK
R  75-31-30-200-002). Replace the main flexible shaft in case of excessive wear (Ref. AMM TASK 75-31-30-000-002) and (Ref. AMM TASK 75-31-30-400-002).
 (b) If the system is not hard to rotate and moves freely and smoothly:
 - disconnect the harness HJ8 from the ECU receptacle:
 1 Visually examine the receptacle and connector for damage pin
_ or contamination (Ref. AMM TASK 73-21-50-210-002)
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E F 『 E C F M E E E E 56 E E E 2 Do an electrical resistance check through the J8 harness

_
 between:
 . pins 29 and 30 (17 to 23 Ohms).

 a If the resistance values are in the specified limits:
_
 - replace the VBV gear motor (Ref. AMM TASK 75-31-10-000-002) and (Ref. AMM TASK 75-31-10-400-002).

 - if the fault continues, replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).

 - If the fault continues, replace the VBV sensor (RVDT) (Ref. AMM TASK 75-31-70-000-002) and (Ref. AMM TASK 75-31-70-400-002).

 - If the fault continues, replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 b If the resistance values are out of the specified limits:
_
 - disconnect the harness HJ8 from the HMU and visually examine the receptacle and connector for damage pin or contamination (Ref. AMM TASK 73-21-50-210-002)

 - do a check of the HMU resistance between: . pins 29 and 30 (17 to 23 Ohms).

 * If the resistance values are in the specified limits:

 - replace the defective harness HJ8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041) or

 * If the resistance values are out of the specified limits:

 - replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).

 C. Do the test given in Para. 3.A.
 (1) If the fault is not confirmed:

 - no additional maintenance action is required.

 (2) If the fault continues:

 - repeat the fault isolation procedure.
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 Failure of the Control of the VBV Actuator on Engine 2
 1. Possible Causes
_______________
 - VBV ballscrew actuator

 - flexible shaft

 - VBV gear motor

 - VBV stop mechanism

 - VBV master door actuator

 - main flexible shaft

 - VBV sensor (RVDT)

 - VBV Gear Motor

 - ECU (4000KS)

 - Hydromechanical Unit (HMU)

 - harness HJ8

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
　
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