# Incident 20110610013399I: Gates Learjet 25D, Addison, TX, June 10, 2011 - Type: FAA incident report (Accident/Incident Data System), as reported - Date: June 10, 2011, 14:42 local time - Place: Addison, TX - Airport: Addison Municiple - Damage: No damage - Phase of flight: Taxi - Operating rules: General operating rules (Part 91) - Location: 32.9637° N, 96.8338° W: Placed by OpenAirDocs: center of Addison, TX, within about 6 miles (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=32.9637&lon=-96.8338&mi=10 - Aircraft: N43DR, a cancelled registration (https://openairdocs.org/deregistered/N43DR-2018-06-19) (OpenAirDocs) - Registry model: Gates Learjet 25D (registry code 5170514, https://openairdocs.org/model/gates-learjet-25d) (OpenAirDocs) - Reported make and model: GATES LEARJET 25D - People aboard: 2 - Fatal injuries: 0 - Other injuries: 0 - Pilot certificates: Airline transport, flight instructor - Pilot flight hours: 19,600 total - FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/) - Page: https://openairdocs.org/incident/20110610013399I ## Narrative As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^. ON JUNE 10, 2011 AT APPROXIMATELY 14:42 CSD A GATES LEAR 25 WAS TURNING OFF OF THE ACTIVE RUNWAY AT ADDISON AIRPORT IN ADDISON, TEXAS. THE AIRCRAFT EXPERIENCED BRAKE FAILURE IN THE MIDDLE OF THE TURN WHILE EXITING THE RUNWAY. THIS CAUSED ACTIVE RUNWAY 15 TO BE CLOSED FOR ABOUT 15 MINUTES WHILE THE AIRCRAFT WAS BEING TOWED CLEAR. THERE WAS NO DAMAGE TO THE AIRCRAFT OR INJURIES TO THE TWO CREW MEMBERS.THE PILOT WAS CONTACTED ON JUNE 20, 2011 ABOUT THE INCIDENT. ^PRIVACY DATA OMITTED^ RELATED THAT THE CREW HAD BEEN CONDUCTING CURRENCY TRAINING IN TUCSON, AZ AND THAT THE FLIGHT BACK TO ADDISON WAS NORMAL. HE SAID THAT THE CREW PERFORMED A RIGHT DOWNWIND APPROACH AT ADDISON AND LOWERED THE GEAR. THE GEAR SEEMED TO TAKE LONGER THAN NORMAL TO FULLY EXTEND/LOCK AND THE HYDRAULIC PRESSURE TOOK LONGER TO BUILD BACK UP TO THE NORMAL RANGE. UPON TOUCHDOWN, THE CREW REVERSED THRUST NORMALLY AND EVERYTHING SEEMED FINE. WHILE TURNING OFF OF THE ACTIVE RUNWAY THE BRAKES FAILED IN THE MIDDLE OF THE TURN AND THE CO-PILOT HAD TO USE THE EMERGENCY BRAKE HANDLE TO STOP THE AIRPLANE. LANMARK GROUND HANDLING TOWED THE AIRPLANE TO AIRFRAME SERVICES TO BE LOOKED AT. AFTER THE TOW, HYDRAULIC FLUID WAS FOUND LEAKING FROM UNDER THE LEFT ENGINE. HYDRAULIC PUMP FAILURE WAS SUSPECTED AT THAT TIME.THE MECHANIC AT AIRFRAME SERVICES WAS CONTACTED TO SHARE HIS FINDINGS. ^PRIVACY DATA OMITTED^ RELATED THAT HYDRAULIC FLUID WAS LEAKING FROM THE UNDERSIDE OF THE LEFT ENGINE COWLING WHEN THE AIRPLANE WAS RECEIVED FOR MAINTENANCE. AFTER REMOVING THE COWLING AND CLEANING UP THE RESIDUAL FLUID, THE HYDRAULIC SYSTEM WAS RE-SERVICED AND BLED. THE AIRCRAFT WAS THEN TOWED OUTSIDE TO THE RAMP AND BOTH ENGINES WERE MOTORIZED TO BUILD UP PRESSURE. THE PRESSURE WAS NORMAL, BUT A NOTICEABLE LEAK BEGAN AT THE LEFT ENGINE HYDRAULIC PUMP. IT WAS FOUND TO HAVE A LEAK AT THE SPLIT LINE OF THE HOUSING EVEN THOUGH IT STILL BUILT UP PRESSURE. IT WAS LEAKING AT A RATE OF ONE DROP PER SECOND. THE PUMP WAS REPLACED WITH A NEW UNIT AND THE AIRCRAFT RETURNED BACK TO SERVICE. ## Other reports on N43DR (1) Matched to the same aircraft by N-number and date. - [Incident 20100212028529I](https://openairdocs.org/incident/20100212028529I), Feb 12, 2010: Gates Learj 25D (N43DR), Sugarland, TX, Minor damage. On February 11, 2010, aircraft N43DR had maintenance performed on the nose gear steering. The computer component that controls the nose wheel steering was… 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.