Casualties unknown

Crew Reports Hypoxia Symptoms Leading to Diversion (N527AU)

Indianapolis, IN, US

On September 21, 1993, a Boeing 737-3B7 (registration N527AU) operated by Usair was involved in an aviation accident near Indianapolis, IN. Investigators recorded the probable cause as: an undetermined problem which resulted in the physical impairment of flight attendants, passengers and the first officer. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 10 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards
Aircraft registered N527AU
Aircraft registered N527AU. Photo: No machine-readable author provided. Svdmolen assumed (based on copyright claims). / CC BY 2.5, via Wikimedia Commons

Flight attendants experienced hypoxia symptoms during flight, with blue fingernails reported. The captain diverted to Indianapolis. Hospital exams found no carbon monoxide poisoning but noted possible toxic inhalational exposure. Subsequent aircraft checks were negative.

Incident Description

During a commercial flight, flight attendants reported symptoms consistent with hypoxia to the flight crew. The first officer conducted a cabin inspection but found no apparent issues. After a second report of hypoxia symptoms, during which the flight attendants' fingernails had turned blue, the captain requested and received an air traffic control clearance to divert the aircraft to Indianapolis for landing.

Medical Examination

Upon landing, the flight attendants and four passengers were examined at a hospital. The medical tests revealed no evidence of carbon monoxide poisoning. However, the hospital reports indicated a diagnosis of 'possible toxic inhalational exposure.'

Aircraft Inspection

Following the incident, the aircraft was tested for carbon monoxide and organic vapors. These tests were performed during a ground runup and during a ferry flight to the company's maintenance center. The results from both checks were negative, showing no detectable levels of those substances.

Conclusion

The investigation did not identify a definitive cause for the hypoxia-like symptoms. No further details are available from the official report.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X13363. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.