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Attributes | |
ACN | 717603 |
Time | |
Date | 200611 |
Local Time Of Day | 0601 To 1200 |
Place | |
Locale Reference | airport : den.airport |
State Reference | CO |
Altitude | agl single value : 0 |
Aircraft 1 | |
Operator | common carrier : air carrier |
Make Model Name | B737-300 |
Operating Under FAR Part | Part 121 |
Flight Phase | ground : takeoff roll |
Flight Plan | IFR |
Person 1 | |
Affiliation | company : air carrier |
Function | flight crew : captain oversight : pic |
Experience | flight time last 90 days : 200 flight time total : 14000 flight time type : 230 |
ASRS Report | 717603 |
Person 2 | |
Affiliation | company : air carrier |
Function | flight crew : first officer |
Events | |
Anomaly | aircraft equipment problem : less severe |
Independent Detector | other flight crewa |
Resolutory Action | flight crew : rejected takeoff |
Consequence | other |
Supplementary | |
Problem Areas | Aircraft |
Primary Problem | Aircraft |
Narrative:
Gross takeoff weight - 121.0 pounds. Planning a flaps 1 degree bleed off takeoff from runway 34R full length. V1=145; vr=146; V2=153. Entering the runway; first officer selected the right bleed off; commented the duct pressure was slow to drop to 10 psi. At 40% N1; right duct pressure = 40 psi; left duct pressure = 10 psi. At 80 KTS; glanced up; right duct pressure indicated 45 psi. Scan back to runway and the airspeed is stuck at 88 KTS with a flag. Decision to reject. Immediately overrode autobrakes to avoid continued use of rejected takeoff with at least 8000 ft remaining. First officer noted airspeed at around 100 KTS; advised ATC of abort and passenger and flight attendants to remain seated. Aircraft cleared runway 34R at 'intersection we' with little braking. Captain requested the fire truck to view brakes for potential fire. Reviewed flight manual for cooling times. Determined 68 mins to cool. Advised den maintenance. After inspection; den maintenance cleared the aircraft to taxi back to the gate. Substituted equipment and the crew continued to destination. A combination of unrelated system failing concurrently combined with a concern that full bleeds off takeoff power was in question led to the decision to abort the takeoff in the low end of the high speed regime.
Original NASA ASRS Text
Title: A B737-300 PLT RPTS REJECTING A TKOF FOR AN AIRSPD GAUGE FAILURE AND AN ENG BLEED VALVE STUCK OPEN DURING A BLEEDS OFF TKOF.
Narrative: GROSS TKOF WT - 121.0 LBS. PLANNING A FLAPS 1 DEG BLEED OFF TKOF FROM RWY 34R FULL LENGTH. V1=145; VR=146; V2=153. ENTERING THE RWY; FO SELECTED THE R BLEED OFF; COMMENTED THE DUCT PRESSURE WAS SLOW TO DROP TO 10 PSI. AT 40% N1; R DUCT PRESSURE = 40 PSI; L DUCT PRESSURE = 10 PSI. AT 80 KTS; GLANCED UP; R DUCT PRESSURE INDICATED 45 PSI. SCAN BACK TO RWY AND THE AIRSPD IS STUCK AT 88 KTS WITH A FLAG. DECISION TO REJECT. IMMEDIATELY OVERRODE AUTOBRAKES TO AVOID CONTINUED USE OF REJECTED TKOF WITH AT LEAST 8000 FT REMAINING. FO NOTED AIRSPD AT AROUND 100 KTS; ADVISED ATC OF ABORT AND PAX AND FLT ATTENDANTS TO REMAIN SEATED. ACFT CLRED RWY 34R AT 'INTXN WE' WITH LITTLE BRAKING. CAPT REQUESTED THE FIRE TRUCK TO VIEW BRAKES FOR POTENTIAL FIRE. REVIEWED FLT MANUAL FOR COOLING TIMES. DETERMINED 68 MINS TO COOL. ADVISED DEN MAINT. AFTER INSPECTION; DEN MAINT CLRED THE ACFT TO TAXI BACK TO THE GATE. SUBSTITUTED EQUIP AND THE CREW CONTINUED TO DEST. A COMBINATION OF UNRELATED SYS FAILING CONCURRENTLY COMBINED WITH A CONCERN THAT FULL BLEEDS OFF TKOF PWR WAS IN QUESTION LED TO THE DECISION TO ABORT THE TKOF IN THE LOW END OF THE HIGH SPD REGIME.
Data retrieved from NASA's ASRS site as of January 2009 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.