(2) Repeat the fault isolation procedure if the fault continues.
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Thrust-Reverser Blocker-Door Stow-Switches Feedback Disagree on Engine 2
1. Possible Causes
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- SW-BLOCKER DOOR STOW, UPPER R (4104KS1)
- SW-BLOCKER DOOR STOW, LOWER R (4104KS2)
- SW-BLOCKER DOOR STOW, LOWER L (4104KS3)
- SW-BLOCKER DOOR STOW, UPPER L (4104KS4)
- ECU (4000KS)
- thrust reverser harness
- harness J5
- harness J6
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-51-43-000-049 Removal of the ECU (Channel A) to Thrust Reverser Junction Box Harnesses (4213KS) AMM 71-51-43-400-049 Installation of the ECU (Channel A) to Thrust
Reverser Junction Box Harnesses (4213KS) AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU) AMM 78-31-00-710-042 Operational Test of the Thrust Reverser System AMM 78-31-18-000-040 Removal Blocker Door Stow-switch
(4104KS1,4104KS2,4104KS3,4104KS4) AMM 78-31-18-400-040 Installation Blocker Door Stow-switch
(4104KS1,4104KS2,4104KS3,4104KS4) AMM 78-31-42-210-041 Detailed Visual Inspection of the electrical Harness AMM 78-32-41-860-001 Manual Deployment of the Blocker Door AWM 71-51-05
3. Fault Confirmation
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A. Do the operational test of the thrust reverser system (2A and 2B) (Ref. AMM TASK 78-31-00-710-042).
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A. This fault message is generated if there is a disagreement between channel A and channel B on the stow switch signal of the thrust reverser blocker doors. Most probable cause is stow switches or a harness failure.
(1) If the test gives the maintenance message STOW SW, J5/J6, ECU on the channel A or B:
- make sure that the thrust reverser blocker doors are in the stowed position,
- disconnect the harnesses J5 and J6 from the ECU (4000KS),
- do a resistance check of the harnesses J5 and J6 (Ref. AWM 71-51-05) between: . pins 24 and 23 (<5 ohms) . pins 24 and 2 (>10 megohms) . pins 24 and 11 (>10 megohms) . pins 2 and 11 (>10 megohms) . pin 24 and the ground (>10 megohms) . pin 23 and the ground (>10 megohms).
(a) If the resistance values are out of the specified limits:
- with the thrust reverser blocker doors in the stowed position, disconnect the harnesses J5 and J6 from each stow switch,
- do a resistance check on each stow switch (Ref. AWM 71-51-05) between: . pins 4 and 7 (>10 megohms) . pins 4 and 9 (<5 ohms) . pin 4 and the ground (>10 megohms) . pins 4 and 12 (>10 megohms) . pins 2 and 3 (>10 megohms) . pins 2 and 5 (<5 ohms) . pin 2 and the ground (>10 megohms) . pins 2 and 1 (>10 megohms).
1_ If the resistance values are out of the specified limits:
- replace the defective:
. SW-BLOCKER DOOR STOW, UPPER R (4104KS1) or/and
. SW-BLOCKER DOOR STOW, LOWER R (4104KS2) or/and
. SW-BLOCKER DOOR STOW, LOWER L (4104KS3) or/and
. SW-BLOCKER DOOR STOW, UPPER L (4104KS4) (Ref. AMM TASK 78-
31-18-000-040) and (Ref. AMM TASK 78-31-18-400-040).
2 If the resistance values are in the specified limits:
_
- do a continuity and insulation check of the thrust reverser and harnesses J5 and J6 between the stow switches including the junction box (4100KS) (Ref. AWM 71-51-05),
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