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B737 flight crew reported faulty brakes during landing roll out.
| Attributes | |
| ACN | 1689354 |
| Time | |
| Date | 201910 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Landing |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 378 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance |
Narrative:
During landing roll; normal manual brake application produced a strong pull to left. As pilot flying; I compensated using differential braking and rudder pedals to keep aircraft on runway while decelerating. The captain took over controls to exit onto D7. I mentioned the abnormal challenge to centerline control; and said it might be the brakes. He tested both wheel brakes at taxi speed; and response seemed normal. I said we should call out maintenance to gate and he agreed.at gate; maintenance discovered that #4 brake was cold. The associated brake hydraulic supply coupling was not fully seated; rendering the brake inoperative. It appeared that a recent brake change in ZZZ1 on that assembly was not completed correctly. The ZZZ maintenance personnel reconnected the supply and tested the brakes; yielding normal operation. The captain wrote up in the logbook that the aircraft pulled left on landing. I am grateful that we discovered this on landing; with a light passenger load; low approach speed; and manual braking. A heavy [rejected takeoff] on a short runway would have produced a very different outcome.it appears that a safety critical system was not properly returned to service. The procedure and personnel involved need to be looked at closely; as well as any work performed by them.
Original NASA ASRS Text
Title: B737 flight crew reported faulty brakes during landing roll out.
Narrative: During landing roll; normal manual brake application produced a strong pull to left. As Pilot Flying; I compensated using differential braking and rudder pedals to keep aircraft on runway while decelerating. The Captain took over controls to exit onto D7. I mentioned the abnormal challenge to centerline control; and said it might be the brakes. He tested both wheel brakes at taxi speed; and response seemed normal. I said we should call out Maintenance to gate and he agreed.At gate; Maintenance discovered that #4 brake was cold. The associated brake hydraulic supply coupling was not fully seated; rendering the brake inoperative. It appeared that a recent brake change in ZZZ1 on that assembly was not completed correctly. The ZZZ Maintenance Personnel reconnected the supply and tested the brakes; yielding normal operation. The Captain wrote up in the logbook that the aircraft pulled left on landing. I am grateful that we discovered this on landing; with a light Passenger load; low approach speed; and manual braking. A heavy [Rejected Takeoff] on a short runway would have produced a very different outcome.It appears that a safety critical system was not properly returned to service. The procedure and personnel involved need to be looked at closely; as well as any work performed by them.
Data retrieved from NASA's ASRS site 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.