# Incident 20210922017339I: Raytheon Aircraft Company 400A, San Jose, CA, September 22, 2021

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: September 22, 2021, 14:57 local time
- Place: San Jose, CA
- Damage: No damage
- Phase of flight: Takeoff: Climb Out
- Operating rules: Air taxi and commuter (Part 135)
- Operator: OEJA
- Location: 37.3394° N, 121.8950° W: Placed by OpenAirDocs: center of San Jose, CA, within about 8 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.3394&lon=-121.8950&mi=10
- Aircraft: N490FL, registered now (https://openairdocs.org/aircraft/N490FL) (OpenAirDocs)
- Registry model: Raytheon 400A (registry code 7150010, https://openairdocs.org/model/raytheon-400a) (OpenAirDocs)
- Registry engine: Williams FJ44-3AP (registry code 66851, https://openairdocs.org/engine/williams-fj44-3ap) (OpenAirDocs)
- Reported make and model: RAYTHEON AIRCRAFT COMPANY 400A
- People aboard: 3
- Fatal injuries: 0
- Other injuries: 0
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20210922017339I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

SAN JOSE, CA (SJC): ^PRIVACY DATA OMITTED^, BE40, SJC-JAC, DECLARED AN EMERGENCY DUE TO PRESSURIZATION ISSUE. PILOT REQUESTED TO RETURN TO SJC. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT AT 2157Z.

PILOT DISCREPANCY NOTED IN AIRCRAFT MAINTENANCE LOGBOOK INDICATED THE FOLLOWING:

?CABIN ALTITUDE WAS HIGHER THAN NORMAL, NOTICED THE CABIN RATE CLIMBING @ 1000 PER MIN. THEN HEARD A WHISTLING NOISE CLOSE TO THE CABIN DOOR. ?CABIN PRESSURE LOW? LIGHT CAME ON. ONCE WE REACHED BELOW 20,000 THEN THE NOISE GOT QUIETER AFTER WE SELECTED ?BOTH HIGH? ON THE CABIN PRESSURE CONTROL. CABIN WOULD NOT MAINTAIN PRESSURE UNTIL WE WERE LOWER AND IN ?BOTH HIGH??.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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