 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Altitude deviation. High climb rate on cold day, flight crew took aircraft out of VNAV in order to slow climb. That de-selected the altitude capture and, if vertical speed was the mode set, the aircraft continued to climb to the erroneously set altitude. Flight crew says it is unknown why altitude changed from 10000 ft to 11000 ft. It must have been erroneously set.
| Attributes | |
| ACN | 328000 |
| Time | |
| Date | 199602 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sdf |
| State Reference | KY |
| Altitude | msl bound lower : 10000 msl bound upper : 10500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sdf artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 10000 flight time type : 3800 |
| ASRS Report | 328000 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 4200 flight time type : 1000 |
| ASRS Report | 328304 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Departed sdf on short flight to lex. Cleared initially to 10000 ft. Aircraft light weight (100000 pounds) and relatively cold day. Due to light weight and cold day the rate of climb was very high. VNAV captured at least 1500 ft before leveloff. In order to slow climb, mode was changed from VNAV which caused altitude capture to be de-selected. When rearming altitude, I believe 11000 ft was inadvertently set in window. We still had altitude armed but unknown to us it was now for 11000 ft, not 10000 ft. Due to high rate of climb and light weight we were unable to safely stop climb until passing 10500 ft. Returned to 10000 ft and continued on to lex.
Original NASA ASRS Text
Title: ALTDEV. HIGH CLB RATE ON COLD DAY, FLC TOOK ACFT OUT OF VNAV IN ORDER TO SLOW CLB. THAT DE-SELECTED THE ALT CAPTURE AND, IF VERT SPD WAS THE MODE SET, THE ACFT CONTINUED TO CLB TO THE ERRONEOUSLY SET ALT. FLC SAYS IT IS UNKNOWN WHY ALT CHANGED FROM 10000 FT TO 11000 FT. IT MUST HAVE BEEN ERRONEOUSLY SET.
Narrative: DEPARTED SDF ON SHORT FLT TO LEX. CLRED INITIALLY TO 10000 FT. ACFT LIGHT WT (100000 LBS) AND RELATIVELY COLD DAY. DUE TO LIGHT WT AND COLD DAY THE RATE OF CLB WAS VERY HIGH. VNAV CAPTURED AT LEAST 1500 FT BEFORE LEVELOFF. IN ORDER TO SLOW CLB, MODE WAS CHANGED FROM VNAV WHICH CAUSED ALT CAPTURE TO BE DE-SELECTED. WHEN REARMING ALT, I BELIEVE 11000 FT WAS INADVERTENTLY SET IN WINDOW. WE STILL HAD ALT ARMED BUT UNKNOWN TO US IT WAS NOW FOR 11000 FT, NOT 10000 FT. DUE TO HIGH RATE OF CLB AND LIGHT WT WE WERE UNABLE TO SAFELY STOP CLB UNTIL PASSING 10500 FT. RETURNED TO 10000 FT AND CONTINUED ON TO LEX.
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.