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A B747-200 PIC reports on the aircraft's tendency to have 'grabbing' brakes. This incident appeared to have slightly injured a flight attendant.
| Attributes | |
| ACN | 418155 |
| Time | |
| Date | 199810 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : nrt |
| State Reference | FO |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747-100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | ground other : taxi |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 10000 flight time type : 1200 |
| ASRS Report | 418155 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other other : unspecified |
| Resolutory Action | other |
| Consequence | other Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On initial taxi after engine start, brakes were released. As soon as aircraft movement was observed, a brake check was initiated. Speed 2-4 KTS, the first 90% of pedal movement had no effect. The next 10% yielded full braking action, resulting in an abrupt stop. A flight attendant standing at her jump seat reported that the braking action forced her down into her jump seat in a sitting position. She complained of dizziness and neck pain. The aircraft returned to the ramp for maintenance where it remained for 2 hours 45 mins. She was asked if she wanted to get off the aircraft and seek assistance, but she said she was ok to continue. She deplaned in spn and did not return to nrt as scheduled. The braking action of the older B747 aircraft often exhibits grabbing brakes, resulting in abrupt stops -- even at slow speeds. The newer 2A, 2B, and even F models do not have this characteristic. The flight attendant was examined at spn and released that evening. She returned to nrt the following day.
Original NASA ASRS Text
Title: A B747-200 PIC RPTS ON THE ACFT'S TENDENCY TO HAVE 'GRABBING' BRAKES. THIS INCIDENT APPEARED TO HAVE SLIGHTLY INJURED A FLT ATTENDANT.
Narrative: ON INITIAL TAXI AFTER ENG START, BRAKES WERE RELEASED. AS SOON AS ACFT MOVEMENT WAS OBSERVED, A BRAKE CHK WAS INITIATED. SPD 2-4 KTS, THE FIRST 90% OF PEDAL MOVEMENT HAD NO EFFECT. THE NEXT 10% YIELDED FULL BRAKING ACTION, RESULTING IN AN ABRUPT STOP. A FLT ATTENDANT STANDING AT HER JUMP SEAT RPTED THAT THE BRAKING ACTION FORCED HER DOWN INTO HER JUMP SEAT IN A SITTING POS. SHE COMPLAINED OF DIZZINESS AND NECK PAIN. THE ACFT RETURNED TO THE RAMP FOR MAINT WHERE IT REMAINED FOR 2 HRS 45 MINS. SHE WAS ASKED IF SHE WANTED TO GET OFF THE ACFT AND SEEK ASSISTANCE, BUT SHE SAID SHE WAS OK TO CONTINUE. SHE DEPLANED IN SPN AND DID NOT RETURN TO NRT AS SCHEDULED. THE BRAKING ACTION OF THE OLDER B747 ACFT OFTEN EXHIBITS GRABBING BRAKES, RESULTING IN ABRUPT STOPS -- EVEN AT SLOW SPDS. THE NEWER 2A, 2B, AND EVEN F MODELS DO NOT HAVE THIS CHARACTERISTIC. THE FLT ATTENDANT WAS EXAMINED AT SPN AND RELEASED THAT EVENING. SHE RETURNED TO NRT THE FOLLOWING DAY.
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.