W DOC AIRBUS | TSM A320F

Thermal PTU Inhibition

TASK 29-23-00-810-815-A
Thermal PTU Inhibition

1. Possible Causes
  • PRESS SW-G HYD, FLT CTL [10CE2]
  • SYSTEM-PRESS-SW [1151GN]
  • PRESS SW-Y HYD, FLT CTL [10CE3]
  • SYSTEM-PRESS-SW [3151GN]
  • aircraft wiring
  • DIODE MODULE 1166VD
  • Relay 1826GL
  • Relay 1828GL
  • Relay 1830GL
  • Relay 1832GL
  • Relay 1834GL
  • Relay 1831GL
  • Relay 1836GL
  • Relay 1833GL
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 29-11-00-810-805-A
Loss of the System Pressure of the Green Hydraulic System
TSM TASK 29-13-00-810-805-A
Loss of the System Pressure of the Yellow Hydraulic System
AMM 29-10-00-863-001
Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-863-002
Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-864-001
Depressurize the Green Hydraulic System
AMM 29-10-00-864-002
Depressurize the Yellow Hydraulic System
AMM 29-23-00-710-006
Operational Check of PTU Inhibition Logic
AWM 292302
AWM 292303
3. Fault Confirmation
Subtask 29-23-00-700-051-A ** ON A/C NOT FOR ALL
A. Do the Operation Check of the PTU Inhibition Logic AMM 29-23-00-710-006.
   (1) If the test confirms the fault, go to the Para. Fault Isolation.
   (2) If the test does not confirm the fault, no more troubleshooting is necessary.
   (3) If there are fault messages related to the G(Y) HYD PRESS SW1(2):
     (a) Do the troubleshooting procedures related to these messages first.
NOTE: The Inhibition control logic stops the PTU when:
  • The PRESS SW-G HYD, FLT CTL [10CE2] and SYSTEM-PRESS-SW [1151GN] or PRESS SW-Y HYD, FLT CTL [10CE3] and SYSTEM-PRESS-SW [3151GN] are in the low pressure position for more than 6 seconds
    and
  • The aircraft is in flight (NLG shock absorber not compressed)
    and
  • The two CBs 1801GL and 1825GL are closed.
4. Fault Isolation
Subtask 29-23-00-810-067-A ** ON A/C NOT FOR ALL
A. If there is confirmation of the fault:
   (1) Pressurize the green hydraulic system AMM 29-10-00-863-001.
     (a) Do a check of the ECAM for a G HYD SYS LO PRESS warning.
       1 If there is a G HYD SYS LO PRESS warning:
         a Depressurize the green hydraulic system AMM 29-10-00-864-001.
         b Do the troubleshooting procedure for Loss of the System Pressure of the Green Hydraulic System (Ref. TSM TASK 29-11-00-810-805).
         c Do the test given in the Para. Fault Confirmation:
  • If the fault continues, go to Para. 4.A.(2).
       2 If there is no warning, depressurize the green hydraulic system AMM 29-10-00-864-001:
  • Do the subsequent step.
   (2) Pressurize the yellow hydraulic system AMM 29-10-00-863-002.
     (a) Do a check of the ECAM for a Y HYD SYS LO PRESS warning.
       1 If there is a Y HYD SYS LO PRESS warning:
         a Depressurize the yellow hydraulic system AMM 29-10-00-864-002.
         b Do the troubleshooting procedure for Loss of the System Pressure of the Yellow Hydraulic system (Ref. TSM TASK 29-13-00-810-805).
         c Do the test given in the Para. Fault Confirmation:
  • If the fault continues go to Para. 4.A.(3).
       2 If there is no warning, depressurize the yellow hydraulic system AMM 29-10-00-864-002:
  • Do the subsequent step.
   (3) Do a check and repair as necessary the aircraft wiring from:
  • Diode Module 1166VD pin A/34 to Relay 1831GL pin A/Z
  • Diode Module 1166VD pin A/30 to Relay 1834GL pin A/Z
  • Diode Module 1166VD pin A/32 to Relay 1826GL pin A/Z
  • Relay 1826GL pin A/B to Terminal Block 1172VT pin 4/R
  • Relay 1826GL pin A/X to Terminal Block 1172VT pin 17/T
  • Relay 1828GL pin A/A2 to Terminal Block 1156VT pin 19/D
  • Relay 1828GL pin A/B2 to Terminal Block 1172VT pin 9/V
  • Relay 1828GL pin A/X1 to Terminal Block 1172VT pin 17/R
  • Relay 1828GL pin A/A1 to Terminal Block 1172VT pin 17/B
  • Relay 1828GL pin A/B1 to Terminal Block 1156VT pin 15/T
  • Relay 1828GL pin A/X2 to Terminal Block 1156VT pin 6/H
  • Relay 1830GL pin A/B to Terminal Block 1172VT pin 17/H
  • Relay 1830GL pin A/X to Terminal Block 1172VT pin 17/J
  • Relay 1830GL pin A/2 to Terminal Block 1172VT pin 9/E
  • Relay 1830GL pin A/Z to Terminal Block 1172VT pin 9/M
  • Relay 1831GL pin A/X to Terminal Block 1172VT pin 8/N
  • Relay 1832GL pin A/X to Terminal Block 1172VT pin 17/C
  • Relay 1833GL pin A/B to Terminal Block 1156VT pin 6/J
  • Relay 1833GL pin A/X to Terminal Block 1172VT pin 8/V
  • Relay 1834GL pin A/A to Terminal Block 1156VT pin 6/K
  • Relay 1834GL pin A/X to Terminal Block 1172VT pin 8/R
  • Relay 1836GL pin A/X to Terminal Block 1172VT pin 17/S
  • AWM 292303.
     (a) Do the test given in the Para. Fault Confirmation.
   (4) If the fault continues:
     (a) Do a check of the DIODE MODULE 1166VD . Make sure there is no continuity of the related diodes from connector A pins:
       1 If there is a defective diode, replace the DIODE MODULE 1166VD .
       2 If there is not a defective diode, do the subsequent step.
   (5) Do a check off the aircraft wiring and the relays that follow for the PTU inhibition system:
  • Relay 1826GL
  • Relay 1828GL
  • Relay 1830GL
  • Relay 1832GL
  • Relay 1834GL
  • Relay 1831GL
  • Relay 1836GL
  • Relay 1833GL
  • AWM 292303.
     (a) Repair or replace the defective relay or wiring as necessary.
     (b) Do the test given in the Para. Fault Confirmation.
5. Close-up
Subtask 29-23-00-942-051-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
   (1) Make sure that the work area is clean and clear of tools and other items.
[Rev.8 from Aug 2018] 2026.04.04 04:29:30 UTC
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