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A B737-300-500 captain reported that, during the first officer's takeoff from ewr, he noted that #1 engine N1 tachometer was malfunctioning so he called the abort and took over the controls for the rejected takeoff.
| Attributes | |
| ACN | 632092 |
| Time | |
| Date | 200409 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ewr.airport |
| State Reference | NJ |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : dpa.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| 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 : 250 flight time total : 23000 flight time type : 5000 |
| ASRS Report | 632092 |
| 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 |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
After receiving takeoff clearance, my first officer advanced the power levers toward our takeoff setting. As the power levers went through about straight up, the #1 engine N1 tach needle stayed at about 27% as the digital readout went to about 55%, with the engine power advancing. I rejected the takeoff prior to 60 KTS. As I exited the runway, the tach went blank.
Original NASA ASRS Text
Title: A B737-300-500 CAPT RPTED THAT, DURING THE FO'S TKOF FROM EWR, HE NOTED THAT #1 ENG N1 TACHOMETER WAS MALFUNCTIONING SO HE CALLED THE ABORT AND TOOK OVER THE CTLS FOR THE REJECTED TKOF.
Narrative: AFTER RECEIVING TKOF CLRNC, MY FO ADVANCED THE PWR LEVERS TOWARD OUR TKOF SETTING. AS THE PWR LEVERS WENT THROUGH ABOUT STRAIGHT UP, THE #1 ENG N1 TACH NEEDLE STAYED AT ABOUT 27% AS THE DIGITAL READOUT WENT TO ABOUT 55%, WITH THE ENG PWR ADVANCING. I REJECTED THE TKOF PRIOR TO 60 KTS. AS I EXITED THE RWY, THE TACH WENT BLANK.
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.