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Potential conflict less than standard separation occurs after flight crew deviation from flight plan filed altitude in a supposed adherence to an ATC clearance.
| Attributes | |
| ACN | 204624 |
| Time | |
| Date | 199203 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fwa |
| State Reference | IN |
| Altitude | msl bound lower : 26000 msl bound upper : 26300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 7800 flight time type : 1500 |
| ASRS Report | 204624 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation non adherence other other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : exited adverse environment flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | horizontal : 24000 vertical : 700 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Climbing out of cmh airport while in contact with indianapolis center, we were instructed to climb to 'FL270.' the captain read back the clearance to the controller ('climb to 270'). I heard the initial clearance and the captain's readback of it to 'climb to 270,' and I repeated it to the captain. As we were climbing through FL250, I noticed our filed flight plan altitude was only to FL260. About the time we were climbing through FL260 for FL270, the TCASII issued a TA for it was showing traffic at 270 within 10 NM. The captain told me to descend back to FL260 at about the time TCASII issued a descend command. (Maximum altitude reached was 26300 ft MSL). ATC came on the radio as we were descending telling us to check our altitude as he showed us at 26300 MSL. We advised ATC we were leveling at FL260 but that the initial clearance had been to climb to FL270. Note: both the captain and myself felt uncomfortable about the climb clearance to FL270. It was not our flight planned altitude, nor is it the correct altitude for the wbound traffic (our destination was chicago). The separation would have been much less had we not had TCASII on board for this is what first alerted us to the conflict.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT LTSS OCCURS AFTER FLC DEV FROM FLT PLAN FILED ALT IN A SUPPOSED ADHERENCE TO AN ATC CLRNC.
Narrative: CLBING OUT OF CMH ARPT WHILE IN CONTACT WITH INDIANAPOLIS CTR, WE WERE INSTRUCTED TO CLB TO 'FL270.' THE CAPT READ BACK THE CLRNC TO THE CTLR ('CLB TO 270'). I HEARD THE INITIAL CLRNC AND THE CAPT'S READBACK OF IT TO 'CLB TO 270,' AND I REPEATED IT TO THE CAPT. AS WE WERE CLBING THROUGH FL250, I NOTICED OUR FILED FLT PLAN ALT WAS ONLY TO FL260. ABOUT THE TIME WE WERE CLBING THROUGH FL260 FOR FL270, THE TCASII ISSUED A TA FOR IT WAS SHOWING TFC AT 270 WITHIN 10 NM. THE CAPT TOLD ME TO DSND BACK TO FL260 AT ABOUT THE TIME TCASII ISSUED A DSND COMMAND. (MAX ALT REACHED WAS 26300 FT MSL). ATC CAME ON THE RADIO AS WE WERE DSNDING TELLING US TO CHK OUR ALT AS HE SHOWED US AT 26300 MSL. WE ADVISED ATC WE WERE LEVELING AT FL260 BUT THAT THE INITIAL CLRNC HAD BEEN TO CLB TO FL270. NOTE: BOTH THE CAPT AND MYSELF FELT UNCOMFORTABLE ABOUT THE CLB CLRNC TO FL270. IT WAS NOT OUR FLT PLANNED ALT, NOR IS IT THE CORRECT ALT FOR THE WBOUND TFC (OUR DEST WAS CHICAGO). THE SEPARATION WOULD HAVE BEEN MUCH LESS HAD WE NOT HAD TCASII ON BOARD FOR THIS IS WHAT FIRST ALERTED US TO THE CONFLICT.
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.