W DOC AIRBUS | TSM A320F

Engine 2 Pylon Loop B Inoperative

TASK 36-22-00-810-835-A
Engine 2 Pylon Loop B Inoperative

1. Possible Causes
  • wiring
  • BMC-2 [1HA2]
  • SENSING ELEMENT-OVHT, R PYLON LOOP B [101HF2]
  • CABLE-CONNECTING, R PYLON LOOP B [104HF2]
  • CABLE-CONNECTING, R PYLON LOOP B [102HF2]
  • SENSING ELEMENT-OVHT, R PYLON LOOP B [106HF2]
  • CABLE-CONNECTING, R PYLON LOOP B [103HF2]
  • CABLE-CONNECTING, R PYLON LOOP B [105HF2]
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
9240SI
1
CONTROLLER-LOOP
 B. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 36-22-00-810-885-A
Leak Detection of the Engine 2 Pylon Loop B
ESPM 204422
AMM 36-11-00-740-802
BITE Test of the Engine Bleed Air System (EBAS) (System Test)
AMM 36-11-34-000-001
Removal of the BMC
AMM 36-11-34-400-001
Installation of the BMC
AMM 36-22-00-100-803
Clean the Overheat Detection System (OHDS) Connectors and Apply the Electrical Insulating Compound
ASM 362201
AWM 362202
AMM 36-22-15-000-802
Removal of the Pylon Overheat Sensing-Elements
AMM 36-22-15-000-803
Removal of the Pylon Overheat Sensing-Elements
AMM 36-22-15-400-802
Installation of the Pylon Overheat Sensing-Elements
AMM 36-22-15-400-803
Installation of the Pylon Overheat Sensing-Elements
3. Fault Confirmation
Subtask 36-22-00-740-057-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the BITE test of the EBAS AMM 36-11-00-740-802.
4. Fault Isolation
Subtask 36-22-00-810-103-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message ENG2 PYLON LOOP B INOP or ENG2 PYLON LOOP B OPEN:
NOTE: This procedure is applicable when there is a loss of the engine-2 pylon loop-B detection-signal or to the incorrect continuity of the loop.
   (1) If the continuity resistance value is less than 8 Ohms:
  • On shelf 96VU, connect the 9240SI CONTROLLER-LOOP between connector BMC-2 pin AA/4D and the ground ASM 362201.
  • Do a check of the insulation resistance shown on the 9240SI CONTROLLER-LOOP.
     (a) If the insulation resistance is more than 10 kOhms:
  • Go to Para. 4.B.
     (b) If the insulation resistance is less than 10 kOhms:
   (2) If the continuity resistance value is more than 8 Ohms
  • Connect the 9240SI CONTROLLER-LOOP between connector 410VC pin A/14 to A/13 AWM 362202.
     (a) If the continuity resistance value is more than 8 Ohms:
  • Do a visual inspection of the sensing elements and the connecting cables on engine 2 pylon loop B.
       1 If a sensing element or a connecting cable is damaged:
       2 If no sensing element or connecting cable is damaged:
  • Go to Para. 4.B.
     (b) If the continuity resistance value is less than 8 Ohms:
  • Connect the 9240SI CONTROLLER-LOOP between connector 410VC pin A/14 and BMC-2 pin AA/4D AWM 362202.
       1 If the continuity resistance value is more than 8 Ohms:
       2 If the continuity resistance value is less than 8 Ohms:
  • Connect the 9240SI CONTROLLER-LOOP between connector 410VC pin A/13 and BMC-2 pin AA/5D AWM 362202.
         a If the continuity resistance value is more than 8 Ohms:
         b If the continuity resistance value is less than 8 Ohms:
Subtask 36-22-00-810-204-A ** ON A/C NOT FOR ALL
B. Dichotomy Procedure
NOTE: The purpose of this procedure is to find and isolate the element that causes a high continuity resistance on loop-B of the engine-2 pylon.
   (1) Connect the 9240SI CONTROLLER-LOOP between connector 410VC pin A/14 to terminal block 450VT2 pin 2/A AWM 362202.
   (2) Do a check of the continuity resistance shown on the 9240SI CONTROLLER-LOOP:
     (a) If the continuity resistance value is more than 8 Ohms:
  • Disconnect the sensing element (101HF2) from connecting cables (102HF2) and (104HF2) AMM 36-22-15-000-803.
  • Measure the continuity resistance with the 9240SI CONTROLLER-LOOP between the center pin on the two ends of each of the sensing element.
  • Do a check of the continuity resistance shown on the 9240SI CONTROLLER-LOOP:
       1 If the continuity resistance value is more than 8 Ohms:
       2 If the continuity resistance value is less than 8 Ohms:
     (b) If the continuity resistance value is less than 8 Ohms:
  • Connect the 9240SI CONTROLLER-LOOP between connector 410VC pin A/13 to terminal block 450VT2 pin 2/B AWM 362202.
  • Do a check of the continuity resistance shown on the 9240SI CONTROLLER-LOOP:
       1 If the continuity resistance value is more than 8 Ohms:
  • Disconnect the sensing element (106HF2) from connecting cables (103HF2) and (105HF2) AMM 36-22-15-000-802.
  • Measure the continuity resistance with the 9240SI CONTROLLER-LOOP between the center pin on the two ends of each of the sensing elements.
  • Do a check of the continuity resistance shown on the 9240SI CONTROLLER-LOOP:
         a If the continuity resistance value is more than 8 Ohms:
         b If the continuity resistance value is less than 8 Ohms:
       2 If the continuity resistance value is less than 8 Ohms:
[Rev.8 from Aug 2018] 2026.04.04 04:40:34 UTC
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