W DOC AIRBUS | TSM A320F

Logo Lights - Both Logo Lights do not come on

TASK 33-47-00-810-802-A
Logo Lights - Both Logo Lights do not come on

1. Possible Causes
  • wiring
  • CB 2LR
  • RELAY 5LY
  • SWITCH NAV LOGO 3LA
  • CB 1LA
  • RELAY 6LA
  • CB 2LA
  • RELAY 7LA
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 33-47-00-810-801-A
Logo Lights - One Logo Light does not come on
AMM 27-51-00-740-002
BITE Test of the Slat and Flap Control Computers (Flap System)
AMM 32-31-00-720-002
Functional Test of the Normal Extension and Retraction of the Landing Gear
AMM 33-41-00-710-001
Operational Test of the Navigation Lights
ASM 334101
AMM 33-47-00-710-002
Operational Test of the Logo Lights
ASM 334701
3. Fault Confirmation
Subtask 33-47-00-710-052-B
A. Test
   (1) Do the Operational Test of the Logo Lights AMM 33-47-00-710-002.
   (2) Do the Operational Test of the Navigation Lights AMM 33-41-00-710-001.
4. Fault Isolation
Subtask 33-47-00-810-051-A
A. If the test shows that LOGO LIGHT 3LY or LOGO LIGHT 4LY does not come on:
Subtask 33-47-00-810-056-B
B. If the test shows that the LOGO LIGHT 3LY and LOGO LIGHT 4LY in SWITCH NAV LOGO 3LA position 1 and 2 do not come on:
  • make sure that the SWITCH NAV LOGO 3LA is in position 1 or 2.
  • do a check for approx. 28 VDC at RELAY 5LY connector A/X1 ASM 334701.
   (1) If there is no 28 VDC:
  • do a check of the wiring between:
    RELAY 5LY connector A/X1 and CB 2LR
    ASM 334701.
     (a) If the fault continues:
  • do a check and replace if necessary:
    CB 2LR
    ASM 334101.
   (2) If there is approx. 28 VDC:
  • do a check for a DC GND signal at RELAY 5LY connector A/X2 ASM 334701.
     (a) If there is a GND signal:
  • do a check and replace if necessary:
    RELAY 5LY
    ASM 334701.
     (b) If there is no GND signal:
  • do a check of the wiring between:
    RELAY 5LY connector A/X2 and SFCC1 21VC connector AE/8D,
    RELAY 5LY connector A/X2 and SFCC2 22VC connector AE/8D,
    RELAY 5LY connector A/X2 and LGCIU 5GA2 connector AB/4C
    ASM 334701.
       1 If the fault continues:
Subtask 33-47-00-810-057-A
C. If the test shows that both LOGO LIGHTS 3LY and LOGO LIGHT 4LY in SWITCH NAV LOGO 3LA position 1 do not come on:
  • make sure that the SWITCH NAV LOGO 3LA is in position 1.
  • do a check for approx. 28 VDC at RELAY 6LA connector A/X1 ASM 334101.
   (1) If there is no 28 VDC:
  • do a check of the wiring between:
    RELAY 6LA connector A/X1 and CB 1LA
    ASM 334701.
     (a) If the fault continues:
  • do a check and replace if necessary:
    SWITCH NAV LOGO 3LA ,
    CB 1LA
    ASM 334101.
   (2) If there is approx. 28 VDC:
  • do a check of the wiring between:
    RELAY 6LA connector A/X2 and GND,
    RELAY 6LA connector A/D1 and RELAY 5 LY connector A/X1,
    RELAY 6LA connector A/D2 and CB 2LR
    ASM 334101 and ASM 334701.
     (a) If the fault continues:
Subtask 33-47-00-810-058-A
D. If the test shows that LOGO LIGHT 3LY and LOGO LIGHT 4LY in SWITCH NAV LOGO 3LA position 2 do not come on:
  • make sure that the SWITCH NAV LOGO 3LA is in position 2.
  • do a check for approx. 28 VDC at RELAY 7LA connector A/X1 ASM 334101.
   (1) If there is no 28 VDC:
  • do a check of the wiring between:
    RELAY 7LA connector A/X1 and CB 2LA
    ASM 334101.
     (a) If the fault continues:
  • do a check and replace if necessary:
    SWITCH NAV LOGO 3LA ,
    CB 2LA
    ASM 334101.
   (2) If there is approx. 28 VDC:
  • do a check of the wiring between:
    RELAY 7LA connector A/X2 and GND,
    RELAY 7LA connector A/D1 and RELAY 5LY connector A/X1,
    RELAY 7LA connector A/D2 and CB 2LR
    ASM 334101 and ASM 334701.
     (a) If the fault continues:
Subtask 33-47-00-710-053-A
E. Do the test as given in the Para. 3. A.
5. Close-up
Subtask 33-47-00-860-051-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:31:59 UTC
"WTRUIB" 2025