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20040903023779I

Incident · Minor damage
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FAA incident report · Gulstm G1159 · Houston, TX · September 3, 2004

FAA Aviation Safety Information Portal

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Date
September 3, 2004 · 15:32 local
Place
Houston, TX
Airport
William P Hobby Airport
Phase of flight
Roll-Out (Fixed Wing)
Operating rules
General operating rules (Part 91)
Damage
Minor damage
Aircraft
N500RL
Reported as
Gulstm G1159
Reported engine
Rolls-Royce SPEY5118
People aboard
2
Fatal injuries
0
Pilot’s flight hours
23,000 total1,200 in this make and model150 in the last 90 days

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry 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.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

(-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.

As the FAA filed it

(-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.