LR23 crossed runway hold line at cno because of faulty parking brake.

Attributes
ACN	614166
Time
Date	200404
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cno.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Learjet 25
Operating Under FAR Part	Part 91
Flight Phase	ground : holding ground : taxi
Flight Plan	VFR
Person 1
Affiliation	other
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 250 flight time total : 10000 flight time type : 700
ASRS Report	614166
Person 2
Affiliation	other
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 1600 flight time type : 80
ASRS Report	614167
Events
Anomaly	aircraft equipment problem : less severe incursion : runway non adherence : published procedure non adherence : clearance other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : regained aircraft control
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On apr/thu/04 at chino airport, ca, as PIC of a lear jet 25 and mr X acting as first officer, we taxied to and held short of runway 26L on taxiway G per ground control instruction. After having set the aircraft parking brake on, I left the cockpit and entered the cabin area to readjust the cabin door mechanism due to a door light illumination on the annunciator panel during taxi. When I was in the cabin area, the first officer was loading up the GPS for the day's flight. During this time, I noticed the aircraft begin to roll while the parking brake was set on and told the first officer to apply the brakes, which he did, and stopped the aircraft short of the runway. The aircraft did cross the hold line, but never entered the runway. The aircraft's mechanics were notified of the aircraft's parking brake failure and repaired per the aircraft manufacturer maintenance specifications and entered in the aircraft logbook. No other aircraft were involved. Supplemental information from acn 614167: when I was placing the waypoints into the GPS, the captain told me to apply the brakes because the airplane had begun to roll while the parking brake was on. I stopped the lear short of the runway, though it had crossed the hold line. No other airplanes were involved.

Original NASA ASRS Text

Title: LR23 CROSSED RWY HOLD LINE AT CNO BECAUSE OF FAULTY PARKING BRAKE.

Narrative: ON APR/THU/04 AT CHINO ARPT, CA, AS PIC OF A LEAR JET 25 AND MR X ACTING AS FO, WE TAXIED TO AND HELD SHORT OF RWY 26L ON TXWY G PER GND CTL INSTRUCTION. AFTER HAVING SET THE ACFT PARKING BRAKE ON, I LEFT THE COCKPIT AND ENTERED THE CABIN AREA TO READJUST THE CABIN DOOR MECHANISM DUE TO A DOOR LIGHT ILLUMINATION ON THE ANNUNCIATOR PANEL DURING TAXI. WHEN I WAS IN THE CABIN AREA, THE FO WAS LOADING UP THE GPS FOR THE DAY'S FLT. DURING THIS TIME, I NOTICED THE ACFT BEGIN TO ROLL WHILE THE PARKING BRAKE WAS SET ON AND TOLD THE FO TO APPLY THE BRAKES, WHICH HE DID, AND STOPPED THE ACFT SHORT OF THE RWY. THE ACFT DID CROSS THE HOLD LINE, BUT NEVER ENTERED THE RWY. THE ACFT'S MECHS WERE NOTIFIED OF THE ACFT'S PARKING BRAKE FAILURE AND REPAIRED PER THE ACFT MANUFACTURER MAINT SPECS AND ENTERED IN THE ACFT LOGBOOK. NO OTHER ACFT WERE INVOLVED. SUPPLEMENTAL INFO FROM ACN 614167: WHEN I WAS PLACING THE WAYPOINTS INTO THE GPS, THE CAPT TOLD ME TO APPLY THE BRAKES BECAUSE THE AIRPLANE HAD BEGUN TO ROLL WHILE THE PARKING BRAKE WAS ON. I STOPPED THE LEAR SHORT OF THE RWY, THOUGH IT HAD CROSSED THE HOLD LINE. NO OTHER AIRPLANES WERE INVOLVED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.