 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Aircraft equipment problem forces heading track altitude deviation altitude excursion in overwater operation.
| Attributes | |
| ACN | 247894 |
| Time | |
| Date | 199307 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cyyt |
| State Reference | NF |
| Altitude | msl bound lower : 37500 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny tower : adm |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : atlantic enroute : other oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 12500 flight time type : 1600 |
| ASRS Report | 247894 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : exited adverse environment flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During last 2 hours of transatlantic crossing at FL390, #2 bleed tripped, reset as per pilot's operating manual. Maintained 390, then 10 or so mins #1 bleed tripped, reset per pilot's operating manual. Decided to leave 390 just in case recurrence of both tripping together. Descended to FL375 10 mi north of track, got further descent clearance to FL310 shortly thereafter, maintained FL310 for rest of flight. Aircraft had many previous bleed system write-ups (deviated for WX as well as track clearance).
Original NASA ASRS Text
Title: ACFT EQUIP PROB FORCES HDG TRACK ALTDEV ALT EXCURSION IN OVERWATER OP.
Narrative: DURING LAST 2 HRS OF TRANSATLANTIC XING AT FL390, #2 BLEED TRIPPED, RESET AS PER PLT'S OPERATING MANUAL. MAINTAINED 390, THEN 10 OR SO MINS #1 BLEED TRIPPED, RESET PER PLT'S OPERATING MANUAL. DECIDED TO LEAVE 390 JUST IN CASE RECURRENCE OF BOTH TRIPPING TOGETHER. DSNDED TO FL375 10 MI N OF TRACK, GOT FURTHER DSCNT CLRNC TO FL310 SHORTLY THEREAFTER, MAINTAINED FL310 FOR REST OF FLT. ACFT HAD MANY PREVIOUS BLEED SYS WRITE-UPS (DEVIATED FOR WX AS WELL AS TRACK CLRNC).
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.