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Flight crew misset an altimeter in the descent and leveled off 1000 ft higher than their clearance altitude, after experiencing problems with a pressurization controller. Approach controller intervened just as the flight crew recognized their error.
| Attributes | |
| ACN | 326430 |
| Time | |
| Date | 199601 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sdf |
| State Reference | KY |
| Altitude | msl bound lower : 6000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : sdf |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : sdf |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 11000 flight time type : 2000 |
| ASRS Report | 326430 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : undershoot non adherence : clearance |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On descent into sdf both channels of automatic pressurization controller failed. Passing FL180, with copilot working pressurization in manual, altimeters were reset as per checklist. However, one of captain's altimeters was correctly set at 29.64, but one was incorrectly set at 28.64. (Procedures call for 2 altimeters to be set.) approach control gave instructions to level at 6000 ft. Aircraft was momentarily leveled at 7000 ft due to the 1 misset altimeter. At the same time the crew noticed the error and started down to 6000 ft, the controller stated that the aircraft was cleared to 6000 ft, but still at 7000 ft. The controller was advised of the pressurization operation in manual and that the aircraft would be descending slowly to 6000 ft. The controller said 'no problem' and asked if we needed assistance. We said no and landed without incident. The pressurization malfunction was written up in the maintenance logbook upon flight termination.
Original NASA ASRS Text
Title: FLC MISSET AN ALTIMETER IN THE DSCNT AND LEVELED OFF 1000 FT HIGHER THAN THEIR CLRNC ALT, AFTER EXPERIENCING PROBS WITH A PRESSURIZATION CTLR. APCH CTLR INTERVENED JUST AS THE FLC RECOGNIZED THEIR ERROR.
Narrative: ON DSCNT INTO SDF BOTH CHANNELS OF AUTO PRESSURIZATION CTLR FAILED. PASSING FL180, WITH COPLT WORKING PRESSURIZATION IN MANUAL, ALTIMETERS WERE RESET AS PER CHKLIST. HOWEVER, ONE OF CAPT'S ALTIMETERS WAS CORRECTLY SET AT 29.64, BUT ONE WAS INCORRECTLY SET AT 28.64. (PROCS CALL FOR 2 ALTIMETERS TO BE SET.) APCH CTL GAVE INSTRUCTIONS TO LEVEL AT 6000 FT. ACFT WAS MOMENTARILY LEVELED AT 7000 FT DUE TO THE 1 MISSET ALTIMETER. AT THE SAME TIME THE CREW NOTICED THE ERROR AND STARTED DOWN TO 6000 FT, THE CTLR STATED THAT THE ACFT WAS CLRED TO 6000 FT, BUT STILL AT 7000 FT. THE CTLR WAS ADVISED OF THE PRESSURIZATION OP IN MANUAL AND THAT THE ACFT WOULD BE DSNDING SLOWLY TO 6000 FT. THE CTLR SAID 'NO PROB' AND ASKED IF WE NEEDED ASSISTANCE. WE SAID NO AND LANDED WITHOUT INCIDENT. THE PRESSURIZATION MALFUNCTION WAS WRITTEN UP IN THE MAINT LOGBOOK UPON FLT TERMINATION.
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.