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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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06/27/19

Message Overview:

Fault Message:

FLAP SKEW SENSOR 3/ SFCU/ WRG

Fault Code:

2750034STD

Associated CAS:

SLAT FLAP BIT
(Advisory)

Reporting LRU: Slat/Flap Control Unit (SFCU)
System Description: 27-52-00
Schematic Diagram: 27-50-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 27-50-03 [ Global Express ]  [ G5000 ]  [ Global XRS ]
27-50-04 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

One of the conditions that follow occur:

  • Slat/Flap Control Unit (SFCU) does not receive input from Left Wing Flap Skew Sensor 3 (reported by SFCU 1)
  • SFCU does not receive input from the Right Wing Flap Skew Sensor 3 (reported by SFCU 2)
  • Input received by SFCU 1 or SFCU 2 is not in the permitted range

Possible Causes:

  • Slat/Flap Control Unit (SFCU) 1 (A124)
  • Slat/Flap Control Unit (SFCU) 2 (A95)
  • Left Flap Skew Sensor 3
  • Right Flap Skew Sensor 3
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Skew values from SFCU 1 and SFCU 2 can be monitored by accessing CAIMS:

  1. SYSTEM DIAG
  2. 27-00 FLIGHT CONTROLS
  3. SLAT/FLAP CONTROL UNIT #1 (2)
  4. LRU TEST
  5. SLAT/FLAP POSITION - RAW DATA - SFCU1 (2)
  6. CONFIRM
  7. PAGE 2 OF 2

    For Aircraft Pre SB 700-27-050
    Skew 1 Skew 2 Skew 3 Skew 4
    Recorded Value - - - -
    Calculated Value - - - -
    Recommended Value 9545 9496 8779 9518
    Maximum Permissible 9575 9526 8809 9548
    For Aircraft Post SB 700-27-050
    Skew 1 Skew 2 Skew 3 Skew 4
    Recorded Value - - - -
    Calculated Value - - - -
    Recommended Value 9545 9496 9387 9518
    Maximum Permissible 9575 9526 9417 9548

Quick Links:

Removal of the Slat/Flap Control Unit (SFCU) AMM 27-51-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Slat/Flap Control Unit (SFCU) AMM 27-51-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Flap Skew Sensor AMM 27-52-45-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Flap Skew Sensor AMM 27-52-45-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Access to System Diagnostics AMM 45-45-00-970-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Swap SFCUs.

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

  2. Perform resistance test of left skew sensor 3 and right skew sensor 3.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.
      NOTE: Resistance values for the skew detectors at ambient conditions (75 °F ±10 °F) or (24 °C ±4 °C).

      Left Flap Skew Sensor 3:

      From To Resistance Range
      P/N: GT415-5702-3 (5911043)/GT415-5702-5 (5913491)      		 Result
      A124CP1-35 A124CP1-23 (Excitation) 120 ±20% ohms
      A124CP1-29 A124CP1-41 (Va) 93 ±15% ohms
      A124CP1-42 A124CP1-41 (Vb) 123 ±15% ohms

      Right Flap Skew Sensor 3:

      From To Resistance Range
      P/N: GT415-5702-3 (5911043)/GT415-5702-5 (5913491)      		 Result
      A95CP1-35 A95CP1-23 (Excitation) 120 ±20% ohms
      A95CP1-29 A95CP1-41 (Va) 93 ±15% ohms
      A95CP1-42 A95CP1-41 (Vb) 123 ±15% ohms

  3. Perform wiring checks between left skew sensor 3 and SFCU 1; right skew sensor 3 and SFCU 2.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  4. Replace Skew Sensor 3.
  5. Do close out.

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