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A cpr g-iv flight crew has their FMC start a turn too early. As they were correcting this they have an altitude excursion.
| Attributes | |
| ACN | 347020 |
| Time | |
| Date | 199609 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : aml airport : iad |
| State Reference | VA |
| Altitude | msl bound lower : 4700 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad |
| Operator | general aviation : corporate |
| Make Model Name | Gulfstream IV |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 12500 |
| ASRS Report | 347020 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : far non adherence : clearance other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Flying on autoplt coupled on the FMS the aircraft turned to a heading of 190 degrees, 5 mi before it should have. I disconnected the autoplt and returned on course and was then given a 120 degree heading. When releasing the autoplt, I missed my altitude by 300 ft. I corrected this immediately in my turn.
Original NASA ASRS Text
Title: A CPR G-IV FLC HAS THEIR FMC START A TURN TOO EARLY. AS THEY WERE CORRECTING THIS THEY HAVE AN ALT EXCURSION.
Narrative: FLYING ON AUTOPLT COUPLED ON THE FMS THE ACFT TURNED TO A HDG OF 190 DEGS, 5 MI BEFORE IT SHOULD HAVE. I DISCONNECTED THE AUTOPLT AND RETURNED ON COURSE AND WAS THEN GIVEN A 120 DEG HDG. WHEN RELEASING THE AUTOPLT, I MISSED MY ALT BY 300 FT. I CORRECTED THIS IMMEDIATELY IN MY TURN.
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.