 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
First officer of a learjet 35A descended off assigned altitude due to autoplt hold released without reporter realizing it. Once observed, he immediately climbed back to assigned altitude.
| Attributes | |
| ACN | 407380 |
| Time | |
| Date | 199807 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hub |
| State Reference | TX |
| Altitude | msl bound lower : 9500 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : cid |
| Operator | common carrier : air taxi |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent other |
| Route In Use | enroute airway : zhu |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 287 flight time total : 10790 flight time type : 7200 |
| ASRS Report | 407380 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| 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:
Last IFR leg of the night, autoplt autohold, altitude hold disengaged at 10000 ft MSL, action was taken to recover 500 ft altitude loss. Recovery started before controller called our altitude setting. Factors: complacency, trusting autoplt, last leg, fatigue. (Always double check autoplt functions for proper response.)
Original NASA ASRS Text
Title: FO OF A LEARJET 35A DSNDED OFF ASSIGNED ALT DUE TO AUTOPLT HOLD RELEASED WITHOUT RPTR REALIZING IT. ONCE OBSERVED, HE IMMEDIATELY CLBED BACK TO ASSIGNED ALT.
Narrative: LAST IFR LEG OF THE NIGHT, AUTOPLT AUTOHOLD, ALT HOLD DISENGAGED AT 10000 FT MSL, ACTION WAS TAKEN TO RECOVER 500 FT ALT LOSS. RECOVERY STARTED BEFORE CTLR CALLED OUR ALT SETTING. FACTORS: COMPLACENCY, TRUSTING AUTOPLT, LAST LEG, FATIGUE. (ALWAYS DOUBLE CHK AUTOPLT FUNCTIONS FOR PROPER RESPONSE.)
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.