# Incident 20040903023779I: Gulstm G1159, Houston, TX, September 3, 2004

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: September 3, 2004, 15:32 local time
- Place: Houston, TX
- Airport: William P Hobby Airport
- Damage: Minor damage
- Phase of flight: Roll-Out (Fixed Wing)
- Operating rules: General operating rules (Part 91)
- Location: 29.6458° N, 95.2772° W: Placed by OpenAirDocs at WILLIAM P HOBBY (HOU), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=29.6458&lon=-95.2772&mi=10
- Aircraft: N500RL (not matched to a registry record)
- Reported make and model: GULSTM G1159
- Reported engine: RROYCE SPEY5118
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 23,000 total, 1,200 in this make and model, 150 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20040903023779I

## Narrative

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

(-23) ON FINAL TO RUNWAY 12R AT HOUSTON HOBBY AIRPORT, FLAPS SET TO 20, PILOTS EXPERIENCED A LOUD "BANG" FOLLOWED BY LOSS OF COMBINED HYDRAULIC PRESSURE. PILOTS CONFIRMED LOSS OF COMBINED FLUID. PILOTS PERFORMED EMERGENCY LANDING GEAR BLOW DOWN PROCEDURE, CONFIRMED (3) GEAR DOWN AND LOCKED. UPON TOUCHDOWN, NO AUX HYDRAULIC PRESSURE INDICATED AND THEREFORE EMERGENCY BRAKE HANDLE WAS USED. UNABLE TO MAINTAIN DIRECTIONAL CONTROL DUE TO THE LOSS OF THE COMBINED AND AUX HYDRAULIC PRESSURE. ALL FOUR (4) OF THE MAIN TIRES HAD BLOWN OUT. AS THE AIRCRAFT SLOWED IT BEGAN TO VEER TO THE LEFT. AIRCRAFT EXITED THE CONCRETE INTO THE GRASS AND COME TO A STOP APPROXIMATELY 40 TO 50 FEET INTO THE GRASS. WHEN THE TWO PILOTS EXITED THE AIRCRAFT THEY OBSERVED HYDRAULIC FLUID COMING FROM THE NOSE WHEEL AREA. DURING INVESTIGATION IT WAS FOUND THAT A PLUG IN THE FLAP SELECTOR VALVE, LOCATED IN THE NOSE WHEEL AREA HAD BLOWN OUT WITH THE SAFETY WIRE STILL ATTACHED TO THE PLUG AND THE VALVE. PLUG HAD SIGNS OF THE THREADS BEING FRACTURED. O-RING ON PLUG WAS STILL INTACT. DAMAGE TO AIRCRAFT WAS ON THE RIGHT HAND TRAILING EDGE BOX AND A SMALL DENT ON THE RIGHT HAND FLAP. RIGHT HAND GEAR DOOR FOLLOW ROD WAS BROKEN.

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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