# Incident 20160516004669I: Raytheon Aircraft Company HAWKER 800XP, Denver, CO, May 16, 2016

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: May 16, 2016, 17:15 local time
- Place: Denver, CO
- Airport: Centennial
- Damage: No damage
- Phase of flight: Cruise/Level Flight
- Operating rules: Air taxi and commuter (Part 135)
- Operator: KKVA
- Location: 39.5701° N, 104.8493° W: Placed by OpenAirDocs at CENTENNIAL (APA), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.5701&lon=-104.8493&mi=10
- Aircraft: N405LA (not matched to a registry record)
- Reported make and model: RAYTHEON AIRCRAFT COMPANY HAWKER 800XP
- Reported engine: HONEYWELL TFE731-5BR-2C
- People aboard: 3
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Airline transport
- Pilot flight hours: 5,446 total, 3,593 in this make and model, 73 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20160516004669I

## Narrative

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

ON MAY 17, 2016, THIS OFFICE WAS NOTIFIED BY JET AVIATION FLIGHT SERVICES, KKVA, THROUGH THE SUBMISSION OF THEIR OPERATIONAL IRREGULARITY REPORT, THAT N405LA HAD EXPERIENCED A LOSS OF CABIN PRESSURE IN CRUISE FLIGHT @ FL410 ON MAY 16, 2016. THE AIRCRAFT WAS EN-ROUTE FROM KVNY TO KTEB ON A CFR PART 91 REPOSITIONING FLIGHT, AND DECLARED AN EMERGENCY WITH LANDING AT KAPA (DENVER). THE MASKS AUTOMATICALLY DEPLOYED AND THE AIRCRAFT MADE AN UNEVENTFUL LANDING. MAINTENANCE RECORDS INDICATE THAT THE AIRCRAFT WAS IN FOR SERVICING ON MAY 12, 2016, AT THORNTON AIRCRAFT COMPANY, T2CR294J, LOCATED IN VAN NUYS, CA. ONE OF THE DISCREPANCIES WORKED AT THAT TIME WAS REPORTED AS AN "AFT COMPARTMENT OIL LEAK", REFERENCE THORNTON WO # MX-10360, SQUAWK 4.3. THE CORRECTIVE ACTION READS AS FOLLOWS: "COMPLIED WITH DETAILED VISUAL INSPECTION OF APU, ENGINES BLEED AIR, AND AIR CYCLE SYSTEMS COMPONENTS AND DUCTING. FOUND SMALL AMOUNT OF RESIDUAL OIL IN WATER SEPARATOR BELOW COALESCER. INSPECTED UPSTREAM OF WATER SEPARATOR. NO LEAK SOURCE DETECTED. CLEANED DUCTING AND BLEED AIR COMPONENTS. REPLACED COALESCER AND SEALS AND BONDING STRIP, REINSTALLED ALL COMPONENTS. COMPLIED WITH ENGINE, APU RUNS AND ENVIRONMENTAL SYSTEMS OPS CHECK. COMPLIED WITH LEAK CHECKS OF BLEED AIR COMPONENTS AND DUCTING. NO DISCREPANCIES NOTED. NO FURTHER ACTION REQUIRED AT THIS TIME. REF: AMM 21-10-87." AFTER THE AIRCRAFT INCIDENT, ON MAY 18, 2016, THE AIRCRAFT WAS TROUBLESHOT AND REPAIRED BY WEST STAR AVIATION, PAZR068H. WEST STAR WAS ABLE TO DUPLICATE THE DISCREPANCY AND FOUND A LOOSE DUCT TO THE COOLING TURBINE, LOCATED IN THE AFT COMPARTMENT. THE DUCT WAS RECONNECTED AND A SATISFACTORY OPERATIONAL CHECK OF THE PRESSURIZATION CONTROL SYSTEM AND LEAK CHECK OF AIR CONDITIONING DUCTING, PRESSURIZED AT 8 PSI. JET AVIATION FLIGHT SERVICES ELECTED TO HAVE THE COOLING TURBINE DISCHARGE DUCT REPLACED, ALONG WITH THE FLEX SLEEVES AND ASSOCIATED HARDWARE. LEAK CHECK WAS CONDUCTED AGAIN WITH POSITIVE RESULTS AND THE AIRCRAFT WAS RETURNED TO SERVICE ON MAY 20, 2016.

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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