- disconnect the harness J7 connector from the HMU receptacle and visually examine the receptacle and the connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
2 If no fault is found:
_
a If the VBV Gear Motor Part Number is 396800-7 or 396800-9,
_ replace the VBV Gear Motor, (Ref. AMM TASK 75-31-10-000-002) and (Ref. AMM TASK 75-31-10-400-002).
b If not,
_
- do a check of the Post Flight Report (PFR) and the Schedule Maintenance Report (SMR)/Class 3 report for the maintenance message(s) VBV SNSR, J11, ECU and/or VBV SNSR, J12, ECU.
- replace the VBV sensor (RVDT), (Ref. AMM TASK 75-31-70-000-001) and (Ref. AMM TASK 75-31-70-400-001).
(j) Post SB 75-007
1 If no fault is found:
_
- replace the VBV Gear Motor. (Ref. AMM TASK 75-31-10-000-002) and (Ref. AMM TASK 75-31-10-400-002)
2 If the fault continues:
_
- do a check of the Post Flight Report (PFR) and the Schedule Maintenance Report (SMR)/Class 3 report for the maintenance message(s) VBV SNSR, J11, ECU and/or VBV SNSR, J12, ECU.
- replace the VBV sensor (RVDT), (Ref. AMM TASK 75-31-70-000-001) and (Ref. AMM TASK 75-31-70-400-001).
(k) If the fault continues during subsequent flight:
- replace the ECU (4000KS), (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
B. If the test gives the maintenance message VBV ACT, HMU:
(1) Do a visual inspection of all the VBV doors actuators and flexible shafts through the fan duct panels, check for offset of position between all VBV doors (all VBV doors not set in the same positon) :
(2) Do a check of the rigging of the feedback rod to the VBV position sensor (RVDT) (Ref. AMM TASK 75-31-70-400-002).
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(3) Operate the VBV system manually and make sure that it moves smoothly and freely (Ref. AMM TASK 75-31-00-200-001).
(a) If the system is hard to rotate or does not move freely (non constant torque) or is offset of position is observed between VBV doors:
- 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 HJ7 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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_
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).
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