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A B767-200 in cruise at FL270 had aileron control frozen but regained control using 25-50 pounds of force. Caused by accumulated water and plugged drains.
| Attributes | |
| ACN | 489977 |
| Time | |
| Date | 200010 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : las.airport |
| State Reference | NV |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B767-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j76.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 4000 |
| ASRS Report | 489977 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem flight crew : regained aircraft control |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : inspection performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Aircraft Environmental Factor Maintenance Human Performance Flight Crew Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
After takeoff from sfo, at cruise FL370 10-20 mins, -60 degrees C sat. Autoplt and EICAS light illuminated, disconnecting autoplt. We found the ailerons were jammed frozen. We accomplished our irregular procedure for 'jammed flight controls,' and 1-2 mins with 25-50 pounds of force, aileron control was regained. We kept our altitude within 150 ft of FL370. Course 1-2 mi of centerline, keeping ATC advised. After discussion with our maintenance, they said problem was most likely frozen ice accumulation. Rest of flight okay. Heavy rain had been falling at sfo 6 hours prior to our departure. Took off with 15 degree flaps. 24 hours after our arrival, maintenance and engineering did in fact find dirty water and clogged drain holes.
Original NASA ASRS Text
Title: A B767-200 IN CRUISE AT FL270 HAD AILERON CTL FROZEN BUT REGAINED CTL USING 25-50 LBS OF FORCE. CAUSED BY ACCUMULATED WATER AND PLUGGED DRAINS.
Narrative: AFTER TKOF FROM SFO, AT CRUISE FL370 10-20 MINS, -60 DEGS C SAT. AUTOPLT AND EICAS LIGHT ILLUMINATED, DISCONNECTING AUTOPLT. WE FOUND THE AILERONS WERE JAMMED FROZEN. WE ACCOMPLISHED OUR IRREGULAR PROC FOR 'JAMMED FLT CTLS,' AND 1-2 MINS WITH 25-50 LBS OF FORCE, AILERON CTL WAS REGAINED. WE KEPT OUR ALT WITHIN 150 FT OF FL370. COURSE 1-2 MI OF CTRLINE, KEEPING ATC ADVISED. AFTER DISCUSSION WITH OUR MAINT, THEY SAID PROB WAS MOST LIKELY FROZEN ICE ACCUMULATION. REST OF FLT OKAY. HVY RAIN HAD BEEN FALLING AT SFO 6 HRS PRIOR TO OUR DEP. TOOK OFF WITH 15 DEG FLAPS. 24 HRS AFTER OUR ARR, MAINT AND ENGINEERING DID IN FACT FIND DIRTY WATER AND CLOGGED DRAIN HOLES.
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.