The aircraft MDC Data Reader provides Maintenance Technicians an interface to review status and other information reported by the Auto Throttle system for more in-depth troubleshooting if required. None of the information carried by labels 350 through 354 is recorded or logged by the avionics or Maintenance System. The labels are provided for diagnostic and troubleshooting use, and are not intended for use in flight. The purpose of each label is as follows. 

For the discrete inputs, each bit reports 1 if the associated input pin is grounded and 0 if not grounded.

Label 352 - ARINC 429 Input Faults

The following bits take a value of 1 if an input label associated with the named interfacing LRU or system is missing, has an unexpected SSM, or is selected for use but has an unreasonable (e.g., out of range) value. The associated ARINC 429 label numbers are identified. These input fault statuses will clear immediately upon restoration of valid input.
NOTE: Not all input faults result in "AT FAIL" Advisory CAS.

The Non-Volatile-Memory "Disengaged due to ... " bits take a value of 1 if the Autothrottle disconnects automatically due to the listed condition, and remains latched throughout the rest of the flight and until the next takeoff (including retention through a power cycle). This is intended to assist with snag clearance for events which occur in flight. For example, if a momentary loss of power associated with an aircraft system failure causes an Autothrottle disconnect, the setting of bit 19 helps maintenance personnel to understand that the Autothrottle disconnected as designed due to loss of bus power.

The "AT RETARD INHIBIT" bits indicate the cause of the "AT RETARD INHIBIT" CAS message; "RA" is a trip due to a loss of, unreasonable value of, or an unexpected Radio Altitude input, and "Config" is a trip due to a loss of, unreasonable value of, or an unexpected FLAP/GEAR/FGS mode combination or sequence.

NVM Reset: 

The Current/Last Leg (Label 353) and Last 5 Legs NVM  (Label 354) data fields may be cleared when the aircraft is on ground by pressing and holding both disconnect buttons for more than 10 seconds but less than 30 seconds, and then pressing and momentarily holding the Self-Test button. This function may be helpful to clear a nuisance bit incurred unintentionally during maintenance. Such as powering up the aircraft while on jacks for unrelated maintenance.  

Note: Due to a character/name length limit of the Maintenance System, the labels are annotated as "DISEG" in place of "Disengaged". 
**Note: Bit 13 - Diseg. due to AEO N1 Split >13%, 13% should be 35%. 

The "Label 354 -  last 5 legs NVM" bits have the same meaning as Label 353, except that the events remain latched for 5 flights before clearing, rather than just one. The 5 flights may be useful for Maintenance. 

NVM Reset: 

The Current/Last Leg (Label 353) and Last 5 Legs NVM  (Label 354) data fields may be cleared when the aircraft is on ground by pressing and holding both disconnect buttons for more than 10 seconds but less than 30 seconds, and then pressing and momentarily holding the Self-Test button. This function may be helpful to clear a nuisance bit incurred unintentionally during maintenance. Such as powering up the aircraft while on jacks for unrelated maintenance.  

NOTE: Due to a character/name length limit of the Maintenance System, the labels are annotated as "DISEG" in place of "Disengaged".
**Note: The label 353/354 Bit 13 - Diseg. due to AEO N1 Split >13%, 13% should be 35%.