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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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12/08/23

Observed Fault Troubleshooting Effectivity:


276OBS004 - GROUND SPOILERS DO NOT DEPLOY ON LANDING

Identifier: 276OBS004
Effectivity: AIRCRAFT 20501 - 20999

Review the possible aircraft configurations listed below and determine the aircraft actual configuration. 

Aircraft Configuration: 

  1. Aircraft 20501 to 20936 Pre SB350-76-001 and Pre SB350-22-002. No SECU relays installed.
  2. Post SB350-76-001. SB350-76-001 installs the SECU 1 (K121) & SECU 2 (K122) relays on the side of the center pedestal.
  3. Aircraft 20807 to 20936 Production installed the SECU 1 (K121) & SECU 2 (K122) relays. The SECU 1 (K121) & SECU 2 (K122) relays are installed on the side of the center pedestal. 
  4. Post SB350-22-002 Auto Throttle System (ATS) or 20937 & Subsequent, the SECU relays are installed as part of the Throttle Quadrant Assembly (TQA) and are sealed.

Select the troubleshooting based on the aircraft configuration. 

Configuration 1 - No relays Installed 

Configuration 2 or 3 - Relays Installed on the side of the center pedestal. [SECU 1 (K121) & SECU 2 (K122)].

Configuration 4 - Relays Installed in the TQA as part of the Auto Throttle System (ATS). 

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