Message Name:

NG WOFW1 OPEN

Message Code:

B3-007422

Associated CAS:

PROX SYS FAULT
(Advisory)

PSEU detects an OPEN circuit within the proximity sensor PX03 Right Nose Gear WOFW1 or in the wiring to the proximity sensor or aircraft.

• Proximity-Sensor Electronic Unit (PSEU) (A9)
• Nose Landing-Gear Weight-Off-Wheels 1 Proximity-Sensor (PX03)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

1. Pull and reset the PSEU gear system breakers (CB1-C13, CB1-C14,CB2-C13, CB2-C14).

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

2. Do continuity wiring check between PSEU A9AP1 and NOSE GEAR WOFW 1 (RIGHT) Proximity Sensor PX03. Repair as required.
   

   	From:	To:	Expected Results:
   PSEU	A9AP1Pin 1C	J165 Pin6	≈0Ω
   PSEU	A9AP1Pin 2C	J165 Pin18	≈0Ω

   1. If wiring checks are good, do close out.
   2. If fault remains, continue with next step.

3. Do continuity check of NOSE GEAR WOFW 1 (RIGHT) Proximity Sensor PX03. Repair as required.
   CAUTION: Sensor resistance should be made with a meter using a < 10 mA supply of current. Never apply voltage through a sensor!
   Current will magnetize the sensor rendering it unreliable.
   

   	From:	To:	Expected Results:
   PX03	P165 Pin 6	P165 Pin18	11 - 13 Ω

   1. If PX03 checks are good, do close out.
   2. If fault remains, continue with next step.

4. Replace PX03.
   

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

5. Replace PSEU.
6. Do close out.