 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An ATR42 with a previous history of torque gauge problems has gauge failure after takeoff followed immediately by an autofeather.
| Attributes | |
| ACN | 482380 |
| Time | |
| Date | 200008 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mdsd.airport |
| State Reference | FO |
| Altitude | agl bound lower : 500 agl bound upper : 800 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | other |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | ATR 42 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | climbout : initial climbout : takeoff descent : approach ground : takeoff roll ground : taxi |
| Route In Use | departure : other published ifr departure |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 3400 flight time type : 210 |
| ASRS Report | 482380 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : company policies other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : torque gage other flight crewa |
| Resolutory Action | flight crew : declared emergency |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : unqualified personnel |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Maintenance Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
ATR42-300 departing sdq for sju. Less than 1 min after departure, the #2 engine torque gauge failed. This caused the autofeathering system to activate thinking the engine had failed. Having to follow company procedures, we had to execute the single engine memory items and checklist shutting the #2 engine down. A single engine landing was executed and we taxied back to the ramp. No passenger or crew members were injured -- the aircraft received no damage. An emergency was declared. The only action resulting from poor judgement was the flight prior to the departure. On arrival into sdq, the #2 torque gauge operated intermittently. I called maintenance and they concluded that the gauge would not cause an autofeather if it failed on takeoff. The gauge worked fine on taxi out and takeoff roll, but failed at 500 ft AGL. In conclusion, the 2 factors of poor judgement are: 1) maintenance poor knowledge of the system and giving the ok for departure. 2) my decision to take off while being concerned about the situation. We should have wrote the gauge up and had maintenance come out and look at it.
Original NASA ASRS Text
Title: AN ATR42 WITH A PREVIOUS HISTORY OF TORQUE GAUGE PROBS HAS GAUGE FAILURE AFTER TKOF FOLLOWED IMMEDIATELY BY AN AUTOFEATHER.
Narrative: ATR42-300 DEPARTING SDQ FOR SJU. LESS THAN 1 MIN AFTER DEP, THE #2 ENG TORQUE GAUGE FAILED. THIS CAUSED THE AUTOFEATHERING SYS TO ACTIVATE THINKING THE ENG HAD FAILED. HAVING TO FOLLOW COMPANY PROCS, WE HAD TO EXECUTE THE SINGLE ENG MEMORY ITEMS AND CHKLIST SHUTTING THE #2 ENG DOWN. A SINGLE ENG LNDG WAS EXECUTED AND WE TAXIED BACK TO THE RAMP. NO PAX OR CREW MEMBERS WERE INJURED -- THE ACFT RECEIVED NO DAMAGE. AN EMER WAS DECLARED. THE ONLY ACTION RESULTING FROM POOR JUDGEMENT WAS THE FLT PRIOR TO THE DEP. ON ARR INTO SDQ, THE #2 TORQUE GAUGE OPERATED INTERMITTENTLY. I CALLED MAINT AND THEY CONCLUDED THAT THE GAUGE WOULD NOT CAUSE AN AUTOFEATHER IF IT FAILED ON TKOF. THE GAUGE WORKED FINE ON TAXI OUT AND TKOF ROLL, BUT FAILED AT 500 FT AGL. IN CONCLUSION, THE 2 FACTORS OF POOR JUDGEMENT ARE: 1) MAINT POOR KNOWLEDGE OF THE SYS AND GIVING THE OK FOR DEP. 2) MY DECISION TO TAKE OFF WHILE BEING CONCERNED ABOUT THE SIT. WE SHOULD HAVE WROTE THE GAUGE UP AND HAD MAINT COME OUT AND LOOK AT IT.
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.