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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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03/15/21

Message Overview:

Message Name:

DIN02A FAILED

Message Code:

B3-007562

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: PSEU LRU
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-61-03
32-61-09
32-61-12

Message Description:

Discrete Input 02A (Retract Command) circuit failed.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-000-801
Installation of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-400-801
Functional Test of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-720-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Pull and reset the PSEU gear system breakers (CB1-C13, CB1-C14), (CB2-C13, CB2-C14), recheck the system for the fault.
  2. Check the PSEU plug, 28 VDC power should be on the following pins: A98BP1_3A, 4A, 3C, 4C, 7K, 8K, 7H, 8H. Grounds < 0.5 VDC should be on the following pins: A9BP1_3H, 4H, 3K, 4K, 7A, 7C, 8C.
  3. Check the ARINC 429 data bus from the PSEU A9CP1 pins 1B, 2B to IAPS A4P1 pin 61, 62, and PSEU A9CP1 pins 1B, 2B to DCU pins A14DP1 1A, 1B.
  4. Check the wiring from the PSEU A9BP1 Pin 15B to PL10J/P1 Pin 3 (Landing Gear Control Panel PL10).
  5. With Aircraft Power OFF, set the Gear Control Handle to RETRACT and check wiring and continuity in the Landing Gear Control Panel from Pl10P/J1 Pin 17 and Pin 3. Ensure to have a good ground < 0.5 VDC on PL10P/J1 Pin 17.
  6. If possible, download and have field service review the PSEU NVM. Further troubleshooting will depend on results of the PSEU NVM.
  7. If the wiring checks good and the NVM does not identify external inputs as the fault, replace the PSEU IAW AMM TASK 32-61-09-000-801, AMM TASK 32-61-09-400-801.
  8. Functional check the proximity sensor electronic unit IAW AMM TASK 32-61-09-720-801.

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