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U.S. Statement of Demonstrated Ability Aeromedical Waivers
Aerospace Medicine and Human Performance
|November 22, 2019
Summary
Pilots with a Statement of Demonstrated Ability (SODA) waiver generally have a good safety record. However, SODA waivers were linked to increased accident odds in crop dusting operations.
Area of Science:
- Aviation Safety
- Aeromedical Research
- Pilot Health
Background:
- Statement of Demonstrated Ability (SODA) waivers are issued to U.S. pilots with stable disqualifying medical conditions.
- Approximately 2% of U.S. pilots, totaling around 21,000 individuals, hold a SODA waiver.
Purpose of the Study:
- To investigate the association between SODA waivers and accident risk in U.S. pilots.
- To determine if specific SODA conditions correlate with increased accident rates.
Main Methods:
- Pilot medical exams (2002-2011) were linked to accident data from the National Transportation Safety Board (NTSB).
- Logistic regression analysis was used to explore the relationship between SODA waivers/conditions and accident odds.
Main Results:
- No association between SODA waivers and accidents was found for 3rd class medical exams.
- A statistically significant accident odds ratio (OR=1.45) was observed for 1st and 2nd class medical exams.
- Crop dusting operations showed a higher accident OR (1.68) for pilots with SODA waivers; six specific SODA conditions also had elevated ORs but lacked evidence of contribution.
Conclusions:
- SODA waivers are not linked to increased accident risk overall, except in crop dusting operations.
- While some SODA conditions showed elevated accident odds, they were not deemed contributory to the accidents.
- U.S. pilots with SODA waivers demonstrate a satisfactory safety record.
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