R 1_ If damage is found:
R - repair the A/C electrical wiring or replace the J3 harness
R as required
R 2_ If nothing is found:
R - replace the CTL UNIT-THROTTLE, ENG2 (8KS2) (Ref. AMM TASK
R 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
R a_ if the fault repeats on subsequent flights:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001)
R and (Ref. AMM TASK 73-21-60-400-001).
R (2) If the test gives the maintenance message TLA SNSR, J3, ECU:
R - Disconnect the J3 harness from the ECU (4000KS) receptacle and
R visually examine the ECU receptacle and the J3 harness connector
R for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
R (a) If damage on a connector is found:
R - replace or repair as required.
R (b) If nothing is found:
R - do an electrical resistance test through the J3 harness
R between:
R . pins 17 and 30 (30 to 40 ohms)
R . pins 5 and 15 (15 to 25 ohms)
R . pins 29 and 28 (15 to 25 ohms)
R . pins 17 and 16 (> 10 megohms)
R . pins 5 and 16 (> 10 megohms)
R . pins 29 and 16 (> 10 megohms)
R . pin 17 and the ground (> 10 megohms)
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. pin 5 and the ground (> 10 megohms) . pin 29 and the ground (> 10 megohms).
1 If the resistance values are in the specified limits:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
2 If the resistance values are out of the specified limits:
_ R - disconnect the connector CC at the throttle control unit R (8KS2) and do the resistance check at the throttle control
unit connector between:
. pins A, B (30 to 40 ohms)
. pins C, D (15 to 25 ohms)
. pins E, F (15 to 25 ohms)
.pin A and the ground (> 10 megohms)
.pin B and the ground (> 10 megohms)
.pin C and the ground (> 10 megohms)
a If the resistance values are out of the specified limits:
_
- replace the CTL UNIT-THROTTLE, ENG2 (8KS2) (Ref. AMM TASK 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
b If the resistance values are in the specified limits:
_
- replace the harness J3 (Ref. AMM TASK 71-51-43-000-046) and (Ref. AMM TASK 71-51-43-400-046).
B. Do the test given in Para. 3.A.
(1) No additionnal maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
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TASK 76-11-00-810-807
Loss of the TLA Resolver Signal through the Channel B on Engine 1
1. Possible Causes
_______________
R - A/C electrical wiring R
- CTL UNIT-THROTTLE, ENG1 (8KS1) R - ECU (4000KS) R - harness J4
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
R R R AMM AMM AMM AMM AMM AMM 71-51-43-000-047 71-51-43-400-047 73-21-50-210-002 73-21-60-000-001 73-21-60-400-001 73-29-00-710-040
AMM AMM 76-11-19-000-042 76-11-19-400-042
ASM 73-25/12
3. Fault Confirmation
__________________
Removal of the ECU (Channel B) Harness (4212KS)
Installation of the ECU (Channel B) Harness (4212KS)
Visual Inspection of the Wiring Harnesses
Removal of the Electronic Control Unit (ECU)(4000KS)
Installation of the Electronic Control Unit
(ECU)(4000KS)
Operational Test of the FADEC on the Ground (with
Engine non Motoring)
Removal of the Throttle Control Unit (8KS1, 8KS2)
Installation of the Throttle Control Unit (8KS1,
8KS2)
A. Do the operational test of the FADEC 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________ R A. Do this procedure. R NOTE : The fault is triggered by the ECU if the CHANNEL B TLA resolver
____ R input signal is invalid or out of range.
R (1) If the test does not give the maintenance message TLA SNSR, J4, ECU: R (a) Do a check of the electrical wiring between the throttle control R unit (8KS1) and the ECU (4000KS) (Ref. ASM 73-25/12).
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