# Incident 20230423010559I: Gates Learjet Corp. 35A, Page, AZ, April 23, 2023 - Type: FAA incident report (Accident/Incident Data System), as reported - Date: April 23, 2023, 18:24 local time - Place: Page, AZ - Airport: Page Municipal - Damage: No damage - Phase of flight: Cruise/Level Flight - Operating rules: General operating rules (Part 91) - Operator: Y6WA - Location: 36.9261° N, 111.4484° W: From the FAA - Nearby events: https://openairdocs.org/map.md?lat=36.9261&lon=-111.4484&mi=10 - Aircraft: N135SH, registered now (https://openairdocs.org/aircraft/N135SH) (OpenAirDocs) - Registry model: Gates Learjet 35A (registry code 5170602, https://openairdocs.org/model/gates-learjet-35a) (OpenAirDocs) - Registry engine: Garrett TFE731 series (registry code 29001, https://openairdocs.org/engine/garrett-tfe731-series) (OpenAirDocs) - Reported make and model: GATES LEARJET CORP. 35A - Reported engine: GARRETT TFE731 SERIES - People aboard: 4 - Fatal injuries: 0 - Other injuries: 0 - Pilot certificates: Airline transport - Pilot flight hours: 5,404 total - NTSB investigation: [NTSB WPR23LA167](https://openairdocs.org/ntsb/WPR23LA167) (OpenAirDocs) - FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/) - Page: https://openairdocs.org/incident/20230423010559I ## Narrative As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^. ON 04/23/2023 AT 18:24 MDT ^PRIVACY DATA OMITTED^, LEARJET 35A, S/N 335 DEPARTED KLAS LAS VEGAS, NV FOR KMDW MIDWAY, IL ON A PART 91 REPOSITIONING FLIGHT FOR ^PRIVACY DATA OMITTED^AIR AMBULANCE PART 135 AIR OPERATOR ^PRIVACY DATA OMITTED^. FOUR CREW MEMBERS ONBOARD, TWO PILOTS AND TWO CLINICAL. AIRCRAFT WAS FUELED WITH 674 GALLONS OF JET- A AT ^PRIVACY DATA OMITTED^ FBO AT KLAS BEFORE DEPARTURE. AT CRUISE ALTITUDE, FL350, 30 MINUTES INTO FLIGHT, #2 ENGINE HAD ITT AND N1 FLUCTUATIONS AND LOST POWER. CREW DIVERTED BACK TO KLAS. APPROXIMATELY FIVE MINUTES LATER #1 ENGINE ALSO BEGAN ITT AND N1 FLUCTUATIONS AND LOST POWER. EMERGENCY WAS DECLARED AND CREW ATTEMPTED UNSUCCESSFUL ENGINE RESTART. CREW DEAD STICKED THE AIRCRAFT INTO KPGA PAGE, AZ. AIRCRAFT GLIDE LANDED SAFELY INTO KPGA. FAA POI NOTIFIED ME OF THE INCIDENT AT 12:30 LOCAL ON 04/24/2023. ^PRIVACY DATA OMITTED^AIR AMBULANCE VP AND DOO HAD NOTIFIED HIM ON THE NIGHT OF THE INCIDENT. I CONTACTED THE DOM AND HE SENT ME CURRENT ENGINE TIME MAINTENANCE DATA. HE ALSO STARTED THE SDR PROCESS IAW 14 CFR § 135.415. FUEL TRUCK IN QUESTION AT KLAS HAS BEEN QUARANTINED AND ^PRIVACY DATA OMITTED^ FBO MANAGEMENT HAS BEEN NOTIFIED OF THE INCIDENT. AIRCRAFT IS BEING STORED IN A HANGAR AT KPGA. ^PRIVACY DATA OMITTED^ TESTING OUT OF LOS ANGELES, CA WILL BE ENROUTE TO KPGA ON 04/25/2023 TO ACCOMPLISH FUEL TESTING ON THE AIRCRAFT. ^PRIVACY DATA OMITTED^ FBO PERSONNEL ADMITTED TO DEF CONTAMINATION OF THE FUEL TRUCK FSII TANK. FUEL ANALYSIS ON 04/28/2023 FROM THE LEARJET SUPPORTED DEF CONTAMINATION. THE FBO INVESTIGATION SIDE OF THIS INCIDENT IS BEING HANDLED BY LAS FSDO. WP19 SAS AR RECORDS NOTED BELOW TO THIS SAS AR (SO11202305024) AND EACH OF THE WP19 SAS AR’S ARE LINKED TO EACH OTHER AS WELL. WP19202301649, WP19202301650 AND WP19202301660. THE AIRCRAFT WILL REMAIN IN STORAGE UNTIL THE LEGAL CASE IS SETTLED. THE AIRCRAFT MAY BE BEYOND ECONOMICAL REPAIR DUE TO THE COST OF DECONTAMINATION. NTSB IS ALSO WORKING THIS INCIDENT UNDER WPR23LA167. PRIOR CASES OF DEF CONTAMINATION HAD SAFETY RECOMMENDATION TO BAN DEF AT AIRPORTS BUT THIS WAS NOT SUCCESSFUL DUE TO EPA ACCORDING TO FAA AVIATION FUELS OFFICE OF SENIOR TECHNICAL EXPERTS AVIATION SAFETY | AIRCRAFT CERTIFICATION SERVICE. I AM CURRENTLY WORKING WITH NTSB AND FAA SAFETY RECOMMENDATIONS BRANCH OFFICE OF ACCIDENT INVESTIGATION AND PREVENTION TO SUBMIT A SAFETY RECOMMENDATION FOR ADDING COLORED DYE TO THE FUELING TRUCK DEF CONTAINERS OR SOME TYPE OF LABELING/STORAGE SOLUTION TO MITIGATE THE RISK. I AM ALSO COLLABORATING WITH THE AIRCRAFT DIESEL EXHAUST FLUID CONTAMINATION WORKING GROUP ON THIS. ## The NTSB's investigation of this event (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB WPR23LA167](https://openairdocs.org/ntsb/WPR23LA167), Apr 24, 2023: Gates Learjet 35A (N135SH), Page, AZ, occurrence, no damage. Probable cause: The fueler’s inadvertent addition of diesel exhaust fluid (DEF) to the FSII reservoir on the fuel truck, and its subsequent mixture with the JET A that was used to fuel the airplane, resulting in a… 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. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.