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Air carrier medium large transport altitude deviation during climb causing less than standard separation with aircraft at higher altitude.
| Attributes | |
| ACN | 168504 |
| Time | |
| Date | 199101 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : spa |
| State Reference | SC |
| Altitude | msl bound lower : 26000 msl bound upper : 26400 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute airway : ztl |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 240 flight time total : 6000 flight time type : 2000 |
| ASRS Report | 168504 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 180 flight time total : 10000 flight time type : 7500 |
| ASRS Report | 168651 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared to FL260 in moderate turbulence. At FL260 leveled off with autoplt. We were looking for traffic reported by ATC at FL270 off the left wing. TCAS gave us a traffic alert and we directed our attention to the TCAS and outside to find the traffic. The autoplt could not hold the altitude because of the turbulence and at 26300' the altitude alerter went off. The autoplt was disconnected and at 26400' was started back down to 26000'. This occurred on 1/sat/91 with ZTL frequency 124.37. We were instructed to call center via landline.
Original NASA ASRS Text
Title: ACR MLG ALT DEVIATION DURING CLIMB CAUSING LESS THAN STANDARD SEPARATION WITH ACFT AT HIGHER ALT.
Narrative: CLRED TO FL260 IN MODERATE TURB. AT FL260 LEVELED OFF WITH AUTOPLT. WE WERE LOOKING FOR TFC RPTED BY ATC AT FL270 OFF THE LEFT WING. TCAS GAVE US A TFC ALERT AND WE DIRECTED OUR ATTN TO THE TCAS AND OUTSIDE TO FIND THE TFC. THE AUTOPLT COULD NOT HOLD THE ALT BECAUSE OF THE TURB AND AT 26300' THE ALT ALERTER WENT OFF. THE AUTOPLT WAS DISCONNECTED AND AT 26400' WAS STARTED BACK DOWN TO 26000'. THIS OCCURRED ON 1/SAT/91 WITH ZTL FREQ 124.37. WE WERE INSTRUCTED TO CALL CENTER VIA LANDLINE.
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.