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Captain's misuse of autoplt results in a crossing restriction not being made. Altitude hold switch placed on inadvertently.
| Attributes | |
| ACN | 123406 |
| Time | |
| Date | 198909 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fwa |
| State Reference | IN |
| Altitude | msl bound lower : 23000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other cruise other descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 234 flight time total : 11211 flight time type : 2436 |
| ASRS Report | 123406 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 15000 flight time type : 500 |
| ASRS Report | 123405 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Center gave us a clearance to cross a point 20 mi northeast of ft wayne VOR at FL230. I acknowledged the clearance and selected 23,000 in the flight guidance panel and armed it to autocapture at FL230. On approaching FL240 the captain manually engaged the altitude hold and we leveled off at 24,000. We had problems earlier with the autoplt not capturing the selected altitude and we thought the same thing had occurred this time. By the time we realized we had leveled off at the wrong altitude we were 10 mi past our descent point and center was calling to check on our altitude. We immediately started our descent to FL230. No conflict occurred. Supplemental information from acn 123405: after leveling at FL240 in order to comply with a crossing restriction issued by ZAU, we had been instructed to cross 20 north fwa at 230 and we were now 30 north.
Original NASA ASRS Text
Title: CAPT'S MISUSE OF AUTOPLT RESULTS IN A CROSSING RESTRICTION NOT BEING MADE. ALT HOLD SWITCH PLACED ON INADVERTENTLY.
Narrative: CENTER GAVE US A CLRNC TO CROSS A POINT 20 MI NE OF FT WAYNE VOR AT FL230. I ACKNOWLEDGED THE CLRNC AND SELECTED 23,000 IN THE FLT GUIDANCE PANEL AND ARMED IT TO AUTOCAPTURE AT FL230. ON APCHING FL240 THE CAPT MANUALLY ENGAGED THE ALT HOLD AND WE LEVELED OFF AT 24,000. WE HAD PROBLEMS EARLIER WITH THE AUTOPLT NOT CAPTURING THE SELECTED ALT AND WE THOUGHT THE SAME THING HAD OCCURRED THIS TIME. BY THE TIME WE REALIZED WE HAD LEVELED OFF AT THE WRONG ALT WE WERE 10 MI PAST OUR DSCNT POINT AND CENTER WAS CALLING TO CHECK ON OUR ALT. WE IMMEDIATELY STARTED OUR DSCNT TO FL230. NO CONFLICT OCCURRED. SUPPLEMENTAL INFORMATION FROM ACN 123405: AFTER LEVELING AT FL240 IN ORDER TO COMPLY WITH A XING RESTRICTION ISSUED BY ZAU, WE HAD BEEN INSTRUCTED TO CROSS 20 N FWA AT 230 AND WE WERE NOW 30 N.
Data retrieved from NASA's ASRS site as of August 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.