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Cpr small transport altitude deviation overshot because the PIC did not hear the clearance over cockpit speakers and the first officer failed to enter the amended clearance altitude assignment in the altitude alert.
| Attributes | |
| ACN | 135066 |
| Time | |
| Date | 199001 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lgc |
| State Reference | GA |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 3800 |
| ASRS Report | 135066 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : cfi pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 4000 flight time type : 600 |
| ASRS Report | 135430 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : required legal separation non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were en route from pie to pdk approaching la grange VOR when we were given clearance to cross the arnco intersection at 11,000'. Crossing arnco at 11,000' is part of the mikee arrival into pdk. Before we started our descent out of 240 to 11,000 the controller called us and told us to cross 5 mi north of la grange VOR at and maintain 12,000. I did not reset the altitude alerter to 12,000'. We descended to 11,000' after 5 mi north of la grange VOR which created a traffic conflict with another aircraft which was also at 11,000'. The controller called and told us to climb to 12,000 which we did. I believe there were at least 3 contributing factors to the problem. The first is that the pilot flying was not wearing a head set and I was using an ear piece. The pilot flying couldn't hear my readback and didn't understand the clearance. The second factor is that I didn't reset the altitude alerter. Even though I thought we would level out momentarily at 12,000' I thought we were still cleared to cross arnco at 11,000'. The third factor was the wording of the second clearance. When the controller issued the second clearance to 12,000' 5 mi north, he didn't use words like 'amend altitude' or 'change altitude', he just tacked this clearance onto the first which made us think that he wanted us down raster and didn't change our mind set of getting to 11,000 by arnco. I would suggest that when a controller changes a clearance on an aircraft that the words 'amend' or 'change' be incorporated in the new clearance. Supplemental information from acn 135430: we were told to cross 5 mi north of lgc at 12,000. We interpreted that we were to cross 5 mi north of lgc at 12,000 then descend to 11,000. Our crew members generally use head sets, but on this day we were using the cockpit speaker and I did not hear the 12,000 restriction and the pilot in the right seat did not enter it into our altitude alerter.
Original NASA ASRS Text
Title: CPR SMT ALT DEVIATION OVERSHOT BECAUSE THE PIC DID NOT HEAR THE CLRNC OVER COCKPIT SPEAKERS AND THE FO FAILED TO ENTER THE AMENDED CLRNC ALT ASSIGNMENT IN THE ALT ALERT.
Narrative: WE WERE ENRTE FROM PIE TO PDK APCHING LA GRANGE VOR WHEN WE WERE GIVEN CLRNC TO CROSS THE ARNCO INTXN AT 11,000'. XING ARNCO AT 11,000' IS PART OF THE MIKEE ARR INTO PDK. BEFORE WE STARTED OUR DSCNT OUT OF 240 TO 11,000 THE CTLR CALLED US AND TOLD US TO CROSS 5 MI N OF LA GRANGE VOR AT AND MAINTAIN 12,000. I DID NOT RESET THE ALT ALERTER TO 12,000'. WE DESCENDED TO 11,000' AFTER 5 MI N OF LA GRANGE VOR WHICH CREATED A TFC CONFLICT WITH ANOTHER ACFT WHICH WAS ALSO AT 11,000'. THE CTLR CALLED AND TOLD US TO CLIMB TO 12,000 WHICH WE DID. I BELIEVE THERE WERE AT LEAST 3 CONTRIBUTING FACTORS TO THE PROBLEM. THE FIRST IS THAT THE PLT FLYING WAS NOT WEARING A HEAD SET AND I WAS USING AN EAR PIECE. THE PLT FLYING COULDN'T HEAR MY READBACK AND DIDN'T UNDERSTAND THE CLRNC. THE SECOND FACTOR IS THAT I DIDN'T RESET THE ALT ALERTER. EVEN THOUGH I THOUGHT WE WOULD LEVEL OUT MOMENTARILY AT 12,000' I THOUGHT WE WERE STILL CLRED TO CROSS ARNCO AT 11,000'. THE THIRD FACTOR WAS THE WORDING OF THE SECOND CLRNC. WHEN THE CTLR ISSUED THE SECOND CLRNC TO 12,000' 5 MI N, HE DIDN'T USE WORDS LIKE 'AMEND ALT' OR 'CHANGE ALT', HE JUST TACKED THIS CLRNC ONTO THE FIRST WHICH MADE US THINK THAT HE WANTED US DOWN RASTER AND DIDN'T CHANGE OUR MIND SET OF GETTING TO 11,000 BY ARNCO. I WOULD SUGGEST THAT WHEN A CTLR CHANGES A CLRNC ON AN ACFT THAT THE WORDS 'AMEND' OR 'CHANGE' BE INCORPORATED IN THE NEW CLRNC. SUPPLEMENTAL INFORMATION FROM ACN 135430: WE WERE TOLD TO CROSS 5 MI N OF LGC AT 12,000. WE INTERPRETED THAT WE WERE TO CROSS 5 MI N OF LGC AT 12,000 THEN DSND TO 11,000. OUR CREW MEMBERS GENERALLY USE HEAD SETS, BUT ON THIS DAY WE WERE USING THE COCKPIT SPEAKER AND I DID NOT HEAR THE 12,000 RESTRICTION AND THE PLT IN THE RIGHT SEAT DID NOT ENTER IT INTO OUR ALT ALERTER.
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.