11/17/2011 

 

APPENDIX 2. SAMPLE FUNCTIONAL 

HAZARD ASSESSMENT (FHA) FORMAT

*Note: This sample FHA is intended to be a guide for format purposes only to illustrate what items should be coperforming an FHA. Since other pertinent information regarding the type of airplane and its features is not provi

content may not be appropriate for other airplanes. 

A2-1 

Function Failure Condition 

Hazard Description 

Phase Effect of Failure Condition on 

Aircraft/Crew 

Classification Reference 

SupportinMaterial 

Display of attitude information to control roll and pitch 

Loss of primary means of attitude information used for control in roll and pitch. Information from standby or other means still available. 

All Crew would not be able to use 

primary means of attitude information and would have to resort to standby or other means. As long as it is clear that the primary means cannot be relied upon, then using the standby or other means would create an increase in crew workload, but doubtful anything more severe. Hypothetical cases where it is not clear as to the integrity of the information may come under the “Misleading attitude information” case below. 

Major AC 23.131

1C 

Display of attitude information to control roll and pitch 

Loss of all means of attitude information. 

All If certified for IFR operation, the 

crew would not have sufficient information to maintain a proper attitude and would likely inadvertently exceed attitude limits, which could result in the loss of control of the aircraft. 

Catastrophic AC 23.131

1C 
11/17/2011 

 

APPENDIX 2. SAMPLE FUNCTIONAL 

HAZARD ASSESSMENT (FHA) FORMAT

*Note: This sample FHA is intended to be a guide for format purposes only to illustrate what items should be coperforming an FHA. Since other pertinent information regarding the type of airplane and its features is not provi

content may not be appropriate for other airplanes. 

A2-2 

Function Failure Condition 

Hazard Description 

Phase Effect of Failure Condition on 

Aircraft/Crew 

Classification Reference 

SupportinMaterial 

Display of attitude information to control roll and pitch

Incorrect attitude information on one display, but not on all displays (not misleading in nature). 

All Generally, this condition would be 

the incorrect attitude with warning on one means of attitude information. For this condition, the crew would realize that this information was incorrect. If there is any chance this would not be clear, the scenario would have to be considered “Misleading attitude information” as described below.

Major AC 23.131

1C 

Display of attitude information to control roll and pitch 

Misleading attitude information. Note: Failure condition with misleading data provided to the autopilot that is handled with the autopilot failure conditions.

All If certified for IFR operation, the 

crew would unknowingly follow incorrect attitude information, and inadvertently exceed attitude limits which could result in the loss of control of the aircraft.

Catastrophic AC 23.131

1C 

Display of powerplant indication oil pressure 

Total Loss of oil pressure display 

All Assumes oil temperature is used as 

a backup 

Minor AC 23.131

1C 

(Next function) 

(Next failure condition, and so on)