Overview
- A SunExpress Boeing 737 on the apron at Frankfurt Airport experienced an auxiliary power unit (APU) failure on Sunday, June 21 that cut the aircraft's on‑ground power and air‑conditioning and let the cabin heat up.
- Police, fire and ambulance teams were called to the gate around 15:15, affected passengers disembarked for treatment on the apron, and the airline says several people needed medical checks but later continued the same‑day flight.
- Passengers and media cited very high cabin readings, with reports up to about 56°C, but no independent or official temperature measurements have been confirmed.
- Frankfurt police have opened an investigation and SunExpress has apologized, said the APU fault was fixed, and told customers it is contacting those affected and carrying out an internal review of the sequence of events.
- The incident raises consumer and legal questions because EU rules can entitle travellers to fixed compensation for long delays and any health claims typically require medical proof; reports of a similar Cologne flight the day before remain unverified and are under scrutiny.