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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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02/26/21

Message Overview:

Message Name:

RTLA FAULT

Message Code:

B3-006876

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 Actuator 1 (RTLA) fault detected by Horizontal Stabilizer Electronic Control Unit (HST ECU).

Possible Causes:

  • Junction Box 1 (JB1)
  • 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 JB1 AMM 24-63-01-000-802
Installation of the Junction Box JB1 AMM 24-63-01-400-802
Removal of the Junction Box JB1 Circuit-Cards AMM 24-63-01-000-803
Installation of the Junction Box JB1 Circuit-Cards AMM 24-63-01-400-803
Functional Test of Junction Box JB1 AMM 24-63-01-720-801
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 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 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
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

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. Ensure power and ground return are available at RTLA channel 1.

    1. If 28 VDC and ground return are available at RTLA connector MPE79P1, go to step 5.
    2. If 28 VDC and ground return are not available at RTLA connector MPE79P1, continue with next step.

  4. Do wiring check between RTLA connector MPE79P1, Junction Box #1, and circuit breaker CB1-B15 TRIM PRI STAB / RUD LIM. Repair/replace as required.

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

  5. Do wiring check between HST ECU connector A130AP1 and RTLA connector MPE79P1. Repair/replace as required.

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

  6. Replace RTLA.

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

  7. Replace HST ECU.
  8. Do close out.

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