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Altimeter discrepancy between CADC, encoding altimeter, captain's altimeter and first officer's altimeter prompts question from controller.
| Attributes | |
| ACN | 294010 |
| Time | |
| Date | 199501 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zny |
| State Reference | NY |
| Altitude | msl bound lower : 23700 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 150 |
| ASRS Report | 294010 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : became reoriented flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | vertical : 800 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
ATC advised altitude readout 200-300 ft below altitude reported. (Transponder off of captain CADC). First officer's altimeter 150-170 ft off from captain's altitude. Traffic on TCASII was showing passing traffic 700-800 ft below or 1200-1300 ft above us with no alert (RA or TA). No action taken or required. At our next stop at bwi, CADC was replaced. Next leg we checked with ATC about altitude readout, with the same result reading 200-300 ft low written up again.
Original NASA ASRS Text
Title: ALTIMETER DISCREPANCY BTWN CADC, ENCODING ALTIMETER, CAPT'S ALTIMETER AND FO'S ALTIMETER PROMPTS QUESTION FROM CTLR.
Narrative: ATC ADVISED ALT READOUT 200-300 FT BELOW ALT RPTED. (XPONDER OFF OF CAPT CADC). FO'S ALTIMETER 150-170 FT OFF FROM CAPT'S ALT. TFC ON TCASII WAS SHOWING PASSING TFC 700-800 FT BELOW OR 1200-1300 FT ABOVE US WITH NO ALERT (RA OR TA). NO ACTION TAKEN OR REQUIRED. AT OUR NEXT STOP AT BWI, CADC WAS REPLACED. NEXT LEG WE CHKED WITH ATC ABOUT ALT READOUT, WITH THE SAME RESULT READING 200-300 FT LOW WRITTEN UP AGAIN.
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.