DOC AIRBUS | AMM A320FChange over the N1 Rotational Speed Indicating Probe Harness Leads 400VS-1, 400VS-2, 400VS-5 and 400VS-6 [IAE]
TASK 77-11-00-860-010-A
Change over the N1 Rotational Speed Indicating Probe Harness Leads 400VS-1, 400VS-2, 400VS-5 and 400VS-6
1. Reason for the Job
This TASK gives the procedure to change over the N1 rotational speed indicating probe harness leads at the terminal block. This procedure is necessary when one of the fan speed probes becomes unserviceable.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 77-11-00-941-050-A ** ON A/C NOT FOR ALL
Subtask 77-11-00-020-051-A ** ON A/C NOT FOR ALL
Subtask 77-11-00-420-051-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:18:08 UTC
Change over the N1 Rotational Speed Indicating Probe Harness Leads 400VS-1, 400VS-2, 400VS-5 and 400VS-6
1. Reason for the Job
This TASK gives the procedure to change over the N1 rotational speed indicating probe harness leads at the terminal block. This procedure is necessary when one of the fan speed probes becomes unserviceable.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | WARNING NOTICE(S) |
| No specific | Torque wrench: range to between 26 and 20 lbf.in (0.29 and 0.23 m.daN )  |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 70-23-11-911-013-A | General Torque Tightening Techniques |
| TASK 71-00-00-700-011-B | Test No.13 : Pretested Replacement Engine Test |
| TASK 71-00-00-700-022-B | Test No.8 : Vibration Survey |
| TASK 71-00-00-710-012-B | Test No.3 : Idle Leak Check |
| TASK 71-00-00-710-022-B | Test No. 6: Electronic Engine Control (EEC) System Idle Test |
| TASK 71-00-00-710-046-B | Test No.2 : Wet Motor Leak Check |
| TASK 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 78-30-00-040-012-A | Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance |
| TASK 78-30-00-440-012-A | Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance |
| TASK 78-32-00-010-010-A | Opening of the Thrust Reverser Halves |
| TASK 78-32-00-410-010-A | Closing of the Thrust Reverser Halves |
Subtask 77-11-00-941-050-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 77-11-00-010-050-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
B. Open the fan cowls (Ref. AMM TASK 71-13-00-010-010)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 77-11-00-040-050-A ** ON A/C NOT FOR ALL Subtask 77-11-00-010-051-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
D. Open the thrust reverser half (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
452AR.
(2) FOR [1000EM2] (ENGINE-2)
462AR.
Subtask 77-11-00-020-050-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
452AR.
(2) FOR [1000EM2] (ENGINE-2)
462AR.
E. Loosen the hose clamp (1) and disconnect the air inlet hose (2) from the air inlet upper fitting
4. ProcedureSubtask 77-11-00-020-051-A ** ON A/C NOT FOR ALL
A. Disconnect the two harness leads from the terminals on the terminal block.
Circuit Diagram of the N1 Rotational Speed Indicating System before Change Over. ** ON A/C NOT FOR ALL
(1) If the fan speed probe No. 1 is unserviceable, disconnect the harness leads No. 1 (400VS-1) and No.2 (400VS-2) from the terminals No.1 and No.2.
(2) If the fan speed probe No.3 is unserviceable, disconnect the harness leads No. 5 (400VS-5) and No.6 (400VS-6) from the terminals No.5 and No.6.
Subtask 77-11-00-420-050-A ** ON A/C NOT FOR ALL Circuit Diagram of the N1 Rotational Speed Indicating System before Change Over. ** ON A/C NOT FOR ALL (2) If the fan speed probe No.3 is unserviceable, disconnect the harness leads No. 5 (400VS-5) and No.6 (400VS-6) from the terminals No.5 and No.6.
B. Connect the harness leads to the spare terminals No.3 and No.4.
(1) IF the fan speed probe No. 1 is unserviceable, connect the harness lead No. 1 (400VS-1) to the terminal No.3 and the harness lead No.2 (400VS-2) to the terminal No. 4
Circuit Diagram of the N1 Rotational Speed Indicating System after Change Over (Probe No. 1 is unserviceable). ** ON A/C NOT FOR ALL
(2) If the fan speed probe No. 3 is unserviceable, connect the harness lead No. 5 (400VS-5) to the terminal No. 3 and the harness lead No. 6 (400VS-6) to the terminal No. 4.
Circuit Diagram of the N1 Rotational Speed Indicating System after Change Over (Probe No. 3 is unserviceable). ** ON A/C NOT FOR ALL
(3) Safety the harness leads with the nuts (11) and the washers (12).
TORQUE the nuts to between 26 and 20 lbf.in (0.29 and 0.23 m.daN ) (Ref. AMM TASK 70-23-11-911-013).
5. Close-up(1) IF the fan speed probe No. 1 is unserviceable, connect the harness lead No. 1 (400VS-1) to the terminal No.3 and the harness lead No.2 (400VS-2) to the terminal No. 4
Circuit Diagram of the N1 Rotational Speed Indicating System after Change Over (Probe No. 1 is unserviceable). ** ON A/C NOT FOR ALL Circuit Diagram of the N1 Rotational Speed Indicating System after Change Over (Probe No. 3 is unserviceable). ** ON A/C NOT FOR ALL TORQUE the nuts to between 26 and 20 lbf.in (0.29 and 0.23 m.daN )
(Ref. AMM TASK 70-23-11-911-013). Subtask 77-11-00-420-051-A ** ON A/C NOT FOR ALL
A. Connect the air inlet hose (2) to the connections of the air inlet fitting and put the hose clamp (1) into position.
Tighten the hose clamp by hand.
Subtask 77-11-00-410-050-A ** ON A/C NOT FOR ALL Tighten the hose clamp by hand.
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser half (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
452AR.
(b) FOR [1000EM2] (ENGINE-2)
462AR.
Subtask 77-11-00-440-050-A ** ON A/C NOT FOR ALL Subtask 77-11-00-410-051-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser half (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
452AR.
(b) FOR [1000EM2] (ENGINE-2)
462AR.
D. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Remove the WARNING NOTICE(S).
Subtask 77-11-00-720-050-B ** ON A/C NOT FOR ALL (1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Remove the WARNING NOTICE(S).
E. Do a N1 speed/trim-balance-probe check (Ref. AMM TASK 71-00-00-710-046) (Ref. AMM TASK 71-00-00-710-012) (Ref. AMM TASK 71-00-00-710-022) (Ref. AMM TASK 71-00-00-700-022) (Ref. AMM TASK 71-00-00-700-011).