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(WARNING)
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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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02/26/21

Message Overview:

Message Name:

RTL SECONDARY

Message Code:

B3-006878

Associated CAS:

RUDDER LIMITER FAULT
(Advisory)

Reporting LRU: HORIZ TRIM ECU
System Description: 27-21-00
Schematic Diagram: 27-21-00
Wiring Diagram: 27-21-27

Message Description:

Rudder Travel Limiter (RTL) Secondary Channel failure detected by Horizontal Stabilizer Electronic Control Unit (HST ECU).

Possible Causes:

  • Junction Box 2 (JB2)
  • Data Concentrator Unit (DCU) (A14)
  • Rudder Travel-Limiter Actuator (RTLA) (MPE79)
  • Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) (A130)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-27-0077 - Troubleshooting Guide for Spoiler Electronic Control Unit and Horizontal Stabilizer Trim Electronic Control Unit (20501 - 20999)
  • AW300-27-0081 - Spoiler Electronic Control Unit (SECU) and Horizontal Stabilizer Electronic Control Unit (HSTECU) - Cold Temperature Circuit Breaker Reset Procedure (20501 - 20999)

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB2 AMM 24-63-05-000-803
Installation of the Junction Box JB2 AMM 24-63-05-400-803
Functional Test of the Junction Box JB2 AMM 24-63-05-720-801
Detailed Inspection of the Rudder Travel Limiter AMM 27-21-00-220-804
Removal of the Rudder Travel Limiter Actuator AMM 27-21-28-000-801
Installation of the Rudder Travel Limiter Actuator AMM 27-21-28-400-801
Operational Test of the Rudder Travel Limiter Actuator AMM 27-21-28-710-801
Electrical Rigging of the Rudder Travel Limiter Actuator AMM 27-21-28-820-801
Removal of the Rudder Travel-Limiter Rotary Variable-Differential Transformer (RVDT) AMM 27-21-29-000-801
Installation of the Rudder Travel-Limiter Rotary Variable-Differential Transformer (RVDT) AMM 27-21-29-400-801
Electrical Rigging of the Rudder Travel-Limiter Rotary Variable-Differential Transformer (RVDT) AMM 27-21-29-820-801
Removal of the Rudder Trim Actuator AMM 27-22-01-000-801
Installation of the Rudder Trim Actuator AMM 27-22-01-400-801
Removal of the Rudder Travel Limiter Actuator AMM 27-22-05-000-801
Installation of the Rudder Travel Limiter Actuator AMM 27-22-05-400-801
Operational Test of the Rudder Travel Limiter Actuator AMM 27-22-05-710-801
Electrical Rigging of the Rudder Travel Limiter Actuator AMM 27-22-05-820-801
Removal of the Horizontal Stabilizer-Trim Actuator (HSTA) AMM 27-41-05-000-801
Installation of the Horizontal Stabilizer-Trim Actuator (HSTA) AMM 27-41-05-400-801
Operational Test of the Horizontal Stabilizer-Trim Actuator (HSTA) Full Range Trimming AMM 27-41-05-710-801
Functional Test of the HSTA Torque Limiter AMM 27-41-05-720-801
Removal of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-000-801
Installation of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-400-801
Operational Test of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-710-801
Removal of the Data Concentrator Unit (DCU) AMM 31-41-01-000-802
Installation of the Data Concentrator Unit (DCU) AMM 31-41-01-400-802
Removal of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
Operational Test of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-710-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02

Troubleshooting Recommendations:

  1. Reset the following circuit breakers with L Hyd, R Hyd and AUX Hyd pressurized.

    PRI STAB TRIM/RUD LIM CB1-B15
    SEC STAB TRIM/RUD LIM CB2-B13

    NOTE: Keep circuit breakers pulled for 10 seconds.

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

  2. Do Operational Test of the Rudder Travel-Limiter Actuator.

    1. If test passes, do close out.
    2. If test fails, continue with next step.

  3. Perform the Electrical Rigging of the Rudder Travel Limiter Actuator (AMM 27-22-05-820-801). Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  4. Ensure power and ground return are available at RTLA channel 2.

    1. If 28 VDC and ground return are available at RTLA connector MPE79P2, go to step 6.
    2. If 28 VDC and ground return are not available at RTLA connector MPE79P2, continue with next step.

  5. Do wiring check between RTLA connector MPE79P2, Junction Box #2 and circuit breaker CB2-B13 TRIM SEC STAB / RUD LIM. Repair/replace as required.

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

  6. Do wiring check between HST ECU connector A130CP1, Junction Box #2, DCU connector A14EP1 and RTLA connector MPE79P2. Repair/replace as required.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.
      NOTE: A short circuit created by a LRUs connected to the Position RTLA Channel 2 transmit bus may cause this fault.

  7. Do wiring check between HST ECU connector A130CP1 and RTLA connector MPE79P2. Repair/replace as required.

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

  8. Replace RTLA.

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

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

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