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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A B727-200 in cruise at FL310 declared an emergency and diverted due to 'a' hydraulic system overheat warning light illuminated caused by a failed thermoswitch.
| Attributes | |
| ACN | 409542 |
| Time | |
| Date | 199807 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : mkc |
| State Reference | MO |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Flight Phase | cruise other other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 50 flight time total : 6000 flight time type : 4000 |
| ASRS Report | 409542 |
| 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 | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
While in cruise, got indication of an 'a' hydraulic system overheat. Followed procedures. Advised maintenance and dispatch. Called amber alert for denver landing. Fire equipment standing by for landing. After uneventful landing, cleared runway, shut down engines, and was towed to gate. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a B727-200 and maintenance reported the overheat was a false warning caused by a failed thermoswitch in the 'a' system return line.
Original NASA ASRS Text
Title: A B727-200 IN CRUISE AT FL310 DECLARED AN EMER AND DIVERTED DUE TO 'A' HYD SYS OVERHEAT WARNING LIGHT ILLUMINATED CAUSED BY A FAILED THERMOSWITCH.
Narrative: WHILE IN CRUISE, GOT INDICATION OF AN 'A' HYD SYS OVERHEAT. FOLLOWED PROCS. ADVISED MAINT AND DISPATCH. CALLED AMBER ALERT FOR DENVER LNDG. FIRE EQUIP STANDING BY FOR LNDG. AFTER UNEVENTFUL LNDG, CLRED RWY, SHUT DOWN ENGS, AND WAS TOWED TO GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A B727-200 AND MAINT RPTED THE OVERHEAT WAS A FALSE WARNING CAUSED BY A FAILED THERMOSWITCH IN THE 'A' SYS RETURN LINE.
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.