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Reporter indicates altitude selector turn knob ineffective in changing altitude of aircraft through the autoplt.
| Attributes | |
| ACN | 189914 |
| Time | |
| Date | 199107 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : hnn |
| State Reference | WV |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 300 flight time total : 12000 flight time type : 250 |
| ASRS Report | 189914 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
In cruise at FL330 copilot noted altitude window on autoplt control panel indicated a selected altitude of 320. When he rotated the knob 1 notch to reset to 330, the window changed to 340. The aircraft maintained FL330 throughout and did not exhibit any unusual characteristics. The incident was repeated 1 more time during the flight approximately 5 mins later. Reported to company maintenance and operations and safety.
Original NASA ASRS Text
Title: RPTR INDICATES ALT SELECTOR TURN KNOB INEFFECTIVE IN CHANGING ALT OF ACFT THROUGH THE AUTOPLT.
Narrative: IN CRUISE AT FL330 COPLT NOTED ALT WINDOW ON AUTOPLT CTL PANEL INDICATED A SELECTED ALT OF 320. WHEN HE ROTATED THE KNOB 1 NOTCH TO RESET TO 330, THE WINDOW CHANGED TO 340. THE ACFT MAINTAINED FL330 THROUGHOUT AND DID NOT EXHIBIT ANY UNUSUAL CHARACTERISTICS. THE INCIDENT WAS REPEATED 1 MORE TIME DURING THE FLT APPROX 5 MINS LATER. RPTED TO COMPANY MAINT AND OPS AND SAFETY.
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.