# SDR AALA202406211016

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 17, 2024
- Submitted: June 21, 2024
- Operation: Air carrier
- Aircraft: [N980UY](https://openairdocs.org/aircraft/N980UY), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 5795
- Aircraft time: 33,878 hours, 13,647 cycles
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Monitor
- Part number: 351H51002
- Part serial: 30194
- Condition: Inoperative
- Location: Mlg Brake Temp
- Part time: 63 hours, 25 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: M, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202406211016

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: AN EMERGENCY WAS DECLARED DURING DESCENT INTO PHL. THE FLIGHT CREW REPORTED THAT AFTER TAKEOFF WITH GEAR UP A HOT BRAKES ECAM FOR #2 BRAKE DISPLAYED, THE FLIGHT CREW LEVELLED OFF THE AIRCRAFT AT 4000', 210 KNOTS AND PUT THE GEAR DOWN. TEMPERATURE CONTINUED TO CLIMB UP TO 900-1000 DEG. THE FLIGHT CREW BROUGHT GEAR UP AND CLIMBED TO 31000'. AFTER A DISCUSSION WITH MOC, THE AIRCRAFT CONTINUED TO PHL. THE FLIGHT CREW REPORTED THAT AT CRUISE ALT, TEMPERATURE ON #2 DECREASED TO 490. WHEN THE FLIGHT CREW DESCENDED INTO PHL THE TEMPERATURE ROSE BACK UP TO 550 DEGREES AND THE FLIGHT CREW PUT GEAR DOWN AND #2 INDICATION WENT TO "XX". THE AIRCRAFT LANDED SAFELY AT PHL AND THE FLIGHT CREW REPORTED THAT ARFF TOOK TEMPERATURE READINGS OF ALL 4 BRAKES AND THEY WERE SAME.   MAINTENANCE REPLACED THE LEFT MAIN LANDING GEAR BRAKE TEMPERATURE MONITORING UNIT (BTMU) AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 32-47-18.

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