W DOC AIRBUS | TSM A320F

Engine 1 Pylon Loop A Inoperative

TASK 36-22-00-810-843-A
Engine 1 Pylon Loop A Inoperative

1. Possible Causes
  • wiring
  • BMC-1 [1HA1]
  • SNSG ELEM-OVHT, ENG 1 PYLON [1HF1]
  • CABLE-CONNECTING, ENG 1 PYLON [2HF1]
  • CABLE-CONNECTING, L PYLON LOOP A [4HF1]
  • SENSING ELEMENT-OVHT, L PYLON LOOP A [6HF1]
  • CABLE ASSY [3HF1]
  • CABLE-CONNECTING, L PYLON LOOP A [5HF1]
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 36-22-00-810-880-A
Leak Detection of the Engine 1 Pylon Loop A
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 362201
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 36-22-00-740-059-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 36-22-00-810-107-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message ENG1 PYLON LOOP A INOP or ENG1 PYLON LOOP A OPEN:
NOTE: This procedure is applicable when there is a loss of the engine-1 pylon loop-A detection-signal or to the incorrect continuity of the loop.
   (1) If the continuity resistance value is less than 8 Ohms:
  • On shelf 95VU, connect the 9240SI CONTROLLER-LOOP between connector BMC-1 pin AA/4E 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 411VC pin A/13 to A/14 AWM 362201.
     (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 1 pylon loop A.
       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 411VC pin A/13 and BMC-1 pin AA/4E AWM 362201.
       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 411VC pin A/14 and BMC-1 pin AA/5E AWM 362201.
         a If the continuity resistance value is more than 8 Ohms:
         b If the continuity resistance value is less than 8 Ohms:
Subtask 36-22-00-810-201-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-A of the engine-1 pylon.
   (1) Connect the 9240SI CONTROLLER-LOOP between connector 411VC pin A/13 to terminal block 450VT1 pin 2/A AWM 362201.
   (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 (1HF1) from connecting cables (2HF1) and (4HF1) 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 411VC pin A/14 to terminal block 450VT1 pin 2/B AWM 362201.
  • 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 (6HF1) from connecting cables (3HF1) and (5HF1) 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 04:40:33 UTC
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