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Pilot reported when he was on approach; he disconnected the B767-300 autopilot and noticed the roll control of aircraft was abnormal. When moving the yoke to roll aircraft to regain localizer centerline; the yoke became difficult to move to increase roll rate.
| Attributes | |
| ACN | 815710 |
| Time | |
| Date | 200812 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl single value : 5000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 210 flight time total : 12000 flight time type : 2000 |
| ASRS Report | 815710 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
On approach; 170 KIAS; flaps 15 degrees. I disconnected the autoplt and noticed that the roll control of aircraft was abnormal. When the yoke was near the center position; operation was normal; but when moving the yoke to roll the aircraft to remain localizer centerline; the yoke became difficult to move to increase roll rate. Movement back to center was normal. This occurred in both roll to left and roll to right. It felt like the first officer was holding the yoke (he was not); or like the 'power steering' had been turned off. First officer flew for a min to verify condition. Increasing to flaps 20 degrees seemed to end condition; and remainder of approach was normal. On ground; flight controls continued to be normal and changing back to flaps 15 degrees gave normal control feel.
Original NASA ASRS Text
Title: PILOT REPORTED WHEN HE WAS ON APPROACH; HE DISCONNECTED THE B767-300 AUTOPILOT AND NOTICED THE ROLL CONTROL OF AIRCRAFT WAS ABNORMAL. WHEN MOVING THE YOKE TO ROLL AIRCRAFT TO REGAIN LOC CENTERLINE; THE YOKE BECAME DIFFICULT TO MOVE TO INCREASE ROLL RATE.
Narrative: ON APCH; 170 KIAS; FLAPS 15 DEGS. I DISCONNECTED THE AUTOPLT AND NOTICED THAT THE ROLL CONTROL OF ACFT WAS ABNORMAL. WHEN THE YOKE WAS NEAR THE CENTER POS; OP WAS NORMAL; BUT WHEN MOVING THE YOKE TO ROLL THE ACFT TO REMAIN LOC CTRLINE; THE YOKE BECAME DIFFICULT TO MOVE TO INCREASE ROLL RATE. MOVEMENT BACK TO CENTER WAS NORMAL. THIS OCCURRED IN BOTH ROLL TO L AND ROLL TO R. IT FELT LIKE THE FO WAS HOLDING THE YOKE (HE WAS NOT); OR LIKE THE 'PWR STEERING' HAD BEEN TURNED OFF. FO FLEW FOR A MIN TO VERIFY CONDITION. INCREASING TO FLAPS 20 DEGS SEEMED TO END CONDITION; AND REMAINDER OF APCH WAS NORMAL. ON GND; FLT CTLS CONTINUED TO BE NORMAL AND CHANGING BACK TO FLAPS 15 DEGS GAVE NORMAL CTL FEEL.
Data retrieved from NASA's ASRS site as of May 2009 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.