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A B727-200 on the ground with the APU operating reported a strong acrid odor throughout the passenger cabin caused by a main system hydraulic leak dripping on hot pneumatic ducting.
| Attributes | |
| ACN | 396635 |
| Time | |
| Date | 199803 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sxm |
| 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 | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 13500 |
| ASRS Report | 396635 |
| 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 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Mar/xx/98 flight xyz msp-jfk-st maarten, there was an odor in cabin and typically this is deicing fluid from APU. We had similar odor in jfk. Maintenance control agreed and we continued flight. Because it occurred again in st maarten we then MEL APU and after startup it occurred again. We deplaned aircraft again and called contract maintenance and worked on aircraft until finding that it was an unusual hydraulic leak and after repair we returned normally on mar/xy/98. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a B727-200 and the strong acrid odor was only present when parked on the ground with the APU running and the 'a' hydraulic system pressurized. The reporter said the cause was found to be a pinhole in a line in the 'a' system in the aft stairwell dripping fluid onto hot pneumatic ducting. The reporter stated the line was repaired and the odor problem was corrected.
Original NASA ASRS Text
Title: A B727-200 ON THE GND WITH THE APU OPERATING RPTED A STRONG ACRID ODOR THROUGHOUT THE PAX CABIN CAUSED BY A MAIN SYS HYD LEAK DRIPPING ON HOT PNEUMATIC DUCTING.
Narrative: MAR/XX/98 FLT XYZ MSP-JFK-ST MAARTEN, THERE WAS AN ODOR IN CABIN AND TYPICALLY THIS IS DEICING FLUID FROM APU. WE HAD SIMILAR ODOR IN JFK. MAINT CTL AGREED AND WE CONTINUED FLT. BECAUSE IT OCCURRED AGAIN IN ST MAARTEN WE THEN MEL APU AND AFTER STARTUP IT OCCURRED AGAIN. WE DEPLANED ACFT AGAIN AND CALLED CONTRACT MAINT AND WORKED ON ACFT UNTIL FINDING THAT IT WAS AN UNUSUAL HYD LEAK AND AFTER REPAIR WE RETURNED NORMALLY ON MAR/XY/98. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B727-200 AND THE STRONG ACRID ODOR WAS ONLY PRESENT WHEN PARKED ON THE GND WITH THE APU RUNNING AND THE 'A' HYD SYS PRESSURIZED. THE RPTR SAID THE CAUSE WAS FOUND TO BE A PINHOLE IN A LINE IN THE 'A' SYS IN THE AFT STAIRWELL DRIPPING FLUID ONTO HOT PNEUMATIC DUCTING. THE RPTR STATED THE LINE WAS REPAIRED AND THE ODOR PROB WAS CORRECTED.
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.