Message Name:

PASSENGER DOOR SENSORS DISAGREE

Message Code:

3231140EL

Associated CAS:

None

There is a possible mechanical failure with the Sensors.

• Passenger Door Fwd Claw Closed (MT42)
• Passenger Door Aft Claw Closed (MT43)
• Passenger Door Handle Stowed Proximity Sensor (MT44)
• Landing-Gear Electronic Control-Unit (LG ECU) (A52)

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

• The logic of the Main Entry Door (Passenger door) FWD G-LOCK HOOK & AFT G-LOCK HOOK sensors on the Channel B of the LGECU is as follow:

  • When door is open:

    • Both sensors are showing LOCKED and Handle sensor is showing NOT STOWED

  • When door is closed:

    • Both sensors are showing NOT LOCKED and Handle sensor is showing STOWED

1. Examine the passenger door sensors and targets for damage.

   1. If there is worn area or damage, repair or replace defective sensor as required and do close out.
   2. If system checks are good, continue with next step.

2. Make sure there is no structural damage in the area of the sensor and the sensor aligns with the related target. Make sure that the clearance between the sensor and the target is 0.035 ±0.005 in.

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

3. On the CAIMS PMAT, perform the steps that follow to run Sensor Test:

   • Go to system diagnostics page
   • Select ATA 32 - Landing Gear
   • Make a selection of the LDG GEAR ELECTRONIC CTRL UNIT (CH B)
   • Select LRU TEST - LGECU B Passenger Sensor Data

   1. Locate the Position Agreement of the Fwd & Aft G-Lock Hook Sensors.

      1. If the condition is agree, do close out.
      2. If the condition is disagree, continue with next step.

4. Perform wiring check between the LGECU and the Passenger Door FWD G-Lock and proximity sensor (MT42)(SP697)
   

   From	To	Expected Result	Result
   A52AP1 - C14	SP697 - A1	Continuity
   A52AP1 - D14	SP697 - B1	Continuity

   1. If the wiring checks are not good, repair the associated wiring and do close out.
   2. If the wiring checks are good, continue with next step.

5. Perform wiring check between the LGECU and the Passenger Door AFT G-Lock Hook Closed and Locked proximity sensor (MT43)(SP698).
   

   From	To	Expected Result	Result
   A52AP1 - C15	SP698 - A1	Continuity
   A52AP1 - D15	SP698 - B1	Continuity

   1. If the wiring checks are not good, repair the associated wiring and do close out.
   2. If the wiring checks are good, continue with next step.

6. Perform wiring check between the LGECU and the Passenger Door Handle Stowed proximity sensor (MT44)(SP709).
   

   From	To	Expected Result	Result
   A52AP1 - C8	SP709 - A1	Continuity
   A52AP1 - D8	SP709 - B1	Continuity

7. Do adjustment of the passenger door proximity sensors and targets.

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

8. Replace the passenger door proximity sensors one at a time to isolate faulty sensor.

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

9. Replace LG ECU.
10. Do close out.