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An EMB120 overshoots its assigned altitude when the flight crew forgets to reset their altimeters to 29 pt 92 when passing through FL180 for FL190.
| Attributes | |
| ACN | 429960 |
| Time | |
| Date | 199903 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ape.vortac |
| State Reference | OH |
| Altitude | msl bound lower : 19000 msl bound upper : 19460 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Turbulence |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Brasilia EMB-120 All Series |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | climbout other cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : flight engineer pilot : commercial pilot : multi engine pilot : instrument |
| Experience | flight time last 90 days : 270 flight time total : 3700 flight time type : 405 |
| ASRS Report | 429960 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 175 flight time total : 2500 flight time type : 800 |
| ASRS Report | 429958 |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe inflight encounter : turbulence non adherence : clearance non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera |
| Resolutory Action | flight crew : returned to original clearance |
| Consequence | faa : investigated faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 30000 vertical : 750 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Weather |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On climb out we were cleared to FL190. About 1 min after leveloff, the controller (ZOB) said he needed us level at FL190 and to descend. Initially I was confused, as the altimeter read FL190, but I soon realized that we had not set 29.92 passing through FL180. The departure altimeter setting at ZOB was 29.46 -- very low. I immediately disconnected the autoplt and descended back FL190. As we began our descent, the TCASII gave a TA. Center had an aircraft at FL200 and climbed them to FL210 as we descended. Center advised us that no minimum separations were exceeded and that no paperwork or actions would be taken. 20 mins later, another controller advised us to call ZID quality control and we found out that they had indeed filed a report. Factors were the very low pressure, forgetting to set 29.92 on climb out, and the captain was making a PA as we passed through FL180. Supplemental information from acn 429958: while he was climbing, I talked to the passenger addressing the turbulence and flying conditions. The flight conditions were IMC and light to moderate turbulence in the climb out. When I returned to communication frequency #1, I had noticed that my first officer had begun a descent and I heard the very end of a transmission from a controller. A modification to our checklists would be a good way to resolve this matter.
Original NASA ASRS Text
Title: AN EMB120 OVERSHOOTS ITS ASSIGNED ALT WHEN THE FLC FORGETS TO RESET THEIR ALTIMETERS TO 29 PT 92 WHEN PASSING THROUGH FL180 FOR FL190.
Narrative: ON CLBOUT WE WERE CLRED TO FL190. ABOUT 1 MIN AFTER LEVELOFF, THE CTLR (ZOB) SAID HE NEEDED US LEVEL AT FL190 AND TO DSND. INITIALLY I WAS CONFUSED, AS THE ALTIMETER READ FL190, BUT I SOON REALIZED THAT WE HAD NOT SET 29.92 PASSING THROUGH FL180. THE DEP ALTIMETER SETTING AT ZOB WAS 29.46 -- VERY LOW. I IMMEDIATELY DISCONNECTED THE AUTOPLT AND DSNDED BACK FL190. AS WE BEGAN OUR DSCNT, THE TCASII GAVE A TA. CTR HAD AN ACFT AT FL200 AND CLBED THEM TO FL210 AS WE DSNDED. CTR ADVISED US THAT NO MINIMUM SEPARATIONS WERE EXCEEDED AND THAT NO PAPERWORK OR ACTIONS WOULD BE TAKEN. 20 MINS LATER, ANOTHER CTLR ADVISED US TO CALL ZID QUALITY CTL AND WE FOUND OUT THAT THEY HAD INDEED FILED A RPT. FACTORS WERE THE VERY LOW PRESSURE, FORGETTING TO SET 29.92 ON CLBOUT, AND THE CAPT WAS MAKING A PA AS WE PASSED THROUGH FL180. SUPPLEMENTAL INFO FROM ACN 429958: WHILE HE WAS CLBING, I TALKED TO THE PAX ADDRESSING THE TURB AND FLYING CONDITIONS. THE FLT CONDITIONS WERE IMC AND LIGHT TO MODERATE TURB IN THE CLBOUT. WHEN I RETURNED TO COM FREQ #1, I HAD NOTICED THAT MY FO HAD BEGUN A DSCNT AND I HEARD THE VERY END OF A XMISSION FROM A CTLR. A MODIFICATION TO OUR CHKLISTS WOULD BE A GOOD WAY TO RESOLVE THIS MATTER.
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.