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A B727-200 on takeoff roll at 80-90 KTS experiences a pack trip failure warning. Captain decides to continue takeoff due to speed.
| Attributes | |
| ACN | 480213 |
| Time | |
| Date | 200007 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : slc.airport |
| State Reference | UT |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | ground : takeoff roll |
| Route In Use | departure : other published ifr departure |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : multi engine pilot : atp pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 4500 flight time type : 1000 |
| ASRS Report | 480213 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument pilot : flight engineer |
| Experience | flight time last 90 days : 175 flight time total : 7500 flight time type : 3927 |
| ASRS Report | 480929 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | other |
| Supplementary | |
| Problem Areas | Chart Or Publication Flight Crew Human Performance Airport Aircraft |
| Primary Problem | Aircraft |
Narrative:
During a normal takeoff roll the 'automatic pack inoperative off armed light' failed to illuminate after throttles were advanced to takeoff power. As so, I announced the malfunction, tested the light bulb, and recycled the arming switch. The captain looked back at the so panel while I was testing the light, possibly causing him to believe the system had started functioning properly. After testing the system, I announced that it still was not working. By this time we were accelerating past 80 KIAS. The copilot asked if we should continue the takeoff and the captain and crew decided to continue the takeoff roll due to the relatively high speed versus low danger caused by the malfunction. (Our gross weight was under that which would require this system to be operating.) normal procedure is to reject the takeoff, but the captain and crew decided the rejected takeoff at night was more dangerous that the malfunction. As a further safety measure, I placed my hands near the air conditioning pack switches so I could act as the 'automatic pack trip off' system if we lost an engine on takeoff. The rest of the flight was normal and we wrote up the malfunction.
Original NASA ASRS Text
Title: A B727-200 ON TKOF ROLL AT 80-90 KTS EXPERIENCES A PACK TRIP FAILURE WARNING. CAPT DECIDES TO CONTINUE TKOF DUE TO SPD.
Narrative: DURING A NORMAL TKOF ROLL THE 'AUTO PACK INOP OFF ARMED LIGHT' FAILED TO ILLUMINATE AFTER THROTTLES WERE ADVANCED TO TKOF PWR. AS SO, I ANNOUNCED THE MALFUNCTION, TESTED THE LIGHT BULB, AND RECYCLED THE ARMING SWITCH. THE CAPT LOOKED BACK AT THE SO PANEL WHILE I WAS TESTING THE LIGHT, POSSIBLY CAUSING HIM TO BELIEVE THE SYS HAD STARTED FUNCTIONING PROPERLY. AFTER TESTING THE SYS, I ANNOUNCED THAT IT STILL WAS NOT WORKING. BY THIS TIME WE WERE ACCELERATING PAST 80 KIAS. THE COPLT ASKED IF WE SHOULD CONTINUE THE TKOF AND THE CAPT AND CREW DECIDED TO CONTINUE THE TKOF ROLL DUE TO THE RELATIVELY HIGH SPD VERSUS LOW DANGER CAUSED BY THE MALFUNCTION. (OUR GROSS WT WAS UNDER THAT WHICH WOULD REQUIRE THIS SYS TO BE OPERATING.) NORMAL PROC IS TO REJECT THE TKOF, BUT THE CAPT AND CREW DECIDED THE REJECTED TKOF AT NIGHT WAS MORE DANGEROUS THAT THE MALFUNCTION. AS A FURTHER SAFETY MEASURE, I PLACED MY HANDS NEAR THE AIR CONDITIONING PACK SWITCHES SO I COULD ACT AS THE 'AUTO PACK TRIP OFF' SYS IF WE LOST AN ENG ON TKOF. THE REST OF THE FLT WAS NORMAL AND WE WROTE UP THE MALFUNCTION.
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.