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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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This CL65 flight crew climbed above their assigned altitude of 17000 ft when they did not xchk their instruments during climb leveloff. Reporter claims an electrical impulse caused the first officer's altimeter to change.
| Attributes | |
| ACN | 337215 |
| Time | |
| Date | 199606 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pnc |
| State Reference | OK |
| Altitude | msl bound lower : 17000 msl bound upper : 17800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 250 flight time total : 19000 flight time type : 2800 |
| ASRS Report | 337215 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance non adherence : far other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
First officer's altimeter crosschecked on ground. An electric impulse on climb caused his altimeter to read 1 inch low (about 1000 ft difference) from captain's altitude setting of 30.03 and defaulted to 29.03. ATC called at 17700 ft to confirm altitude. We recognized the error and made immediate descent to 17000 ft. Captain was briefing passenger at time of occurrence. No incident. Callback conversation with reporter revealed the following information: this captain was aware that this phenomenon occurs on the CL65, but this time he missed xchking the first officer's altimeter. The first officer did not correct his altimeter after putting the #2 generator on the line and the first officer was flying this leg of the trip. The flight crew did not recognize the error until the controller called. The reporter said that his company had issued several bulletins about this problem and continues to work with the aircraft and equipment manufacturers to correct it, but in the meantime the flcs will have to adjust their operating procedures to accommodate this peculiarity. He pledged to do just that.
Original NASA ASRS Text
Title: THIS CL65 FLC CLBED ABOVE THEIR ASSIGNED ALT OF 17000 FT WHEN THEY DID NOT XCHK THEIR INSTS DURING CLB LEVELOFF. RPTR CLAIMS AN ELECTRICAL IMPULSE CAUSED THE FO'S ALTIMETER TO CHANGE.
Narrative: FO'S ALTIMETER XCHKED ON GND. AN ELECTRIC IMPULSE ON CLB CAUSED HIS ALTIMETER TO READ 1 INCH LOW (ABOUT 1000 FT DIFFERENCE) FROM CAPT'S ALT SETTING OF 30.03 AND DEFAULTED TO 29.03. ATC CALLED AT 17700 FT TO CONFIRM ALT. WE RECOGNIZED THE ERROR AND MADE IMMEDIATE DSCNT TO 17000 FT. CAPT WAS BRIEFING PAX AT TIME OF OCCURRENCE. NO INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS CAPT WAS AWARE THAT THIS PHENOMENON OCCURS ON THE CL65, BUT THIS TIME HE MISSED XCHKING THE FO'S ALTIMETER. THE FO DID NOT CORRECT HIS ALTIMETER AFTER PUTTING THE #2 GENERATOR ON THE LINE AND THE FO WAS FLYING THIS LEG OF THE TRIP. THE FLC DID NOT RECOGNIZE THE ERROR UNTIL THE CTLR CALLED. THE RPTR SAID THAT HIS COMPANY HAD ISSUED SEVERAL BULLETINS ABOUT THIS PROB AND CONTINUES TO WORK WITH THE ACFT AND EQUIP MANUFACTURERS TO CORRECT IT, BUT IN THE MEANTIME THE FLCS WILL HAVE TO ADJUST THEIR OPERATING PROCS TO ACCOMMODATE THIS PECULIARITY. HE PLEDGED TO DO JUST THAT.
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.