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A320 altitude reporting to ATC incorrect due to MEL item directing use of #3 ATC which results in altitude report not represented by either pilot's altimeter.
| Attributes | |
| ACN | 692667 |
| Time | |
| Date | 200604 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zkc.artcc |
| State Reference | KS |
| Altitude | msl bound lower : 34700 msl bound upper : 35000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 692667 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued advisory flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
During cruise at FL350; ZKC advised us to maintain FL350. Replied level at FL350. Center advised us that our mode C readout was FL347. My altitude showed FL349.80; first officer's FL348.40; standby altimeter FL351. Within rvsm limits. #2 autoplt engaged. Switched transponder to adr #1 position at which time ATC confirmed us level at FL350. Believe our problem was created due to MEL. First officer angle of attack probe heater inoperative. Situation has us place air data selector to first officer -- our mode C altitude reporting to ATC was from adr #2; so neither pilot's altimeter was representing the altitude being sent to ATC. Recommend the MEL placard be updated to select transponder position to #1 in this case.
Original NASA ASRS Text
Title: A320 ALT RPTING TO ATC INCORRECT DUE TO MEL ITEM DIRECTING USE OF #3 ATC WHICH RESULTS IN ALT RPT NOT REPRESENTED BY EITHER PLT'S ALTIMETER.
Narrative: DURING CRUISE AT FL350; ZKC ADVISED US TO MAINTAIN FL350. REPLIED LEVEL AT FL350. CTR ADVISED US THAT OUR MODE C READOUT WAS FL347. MY ALT SHOWED FL349.80; FO'S FL348.40; STANDBY ALTIMETER FL351. WITHIN RVSM LIMITS. #2 AUTOPLT ENGAGED. SWITCHED XPONDER TO ADR #1 POS AT WHICH TIME ATC CONFIRMED US LEVEL AT FL350. BELIEVE OUR PROB WAS CREATED DUE TO MEL. FO ANGLE OF ATTACK PROBE HEATER INOP. SITUATION HAS US PLACE AIR DATA SELECTOR TO FO -- OUR MODE C ALT RPTING TO ATC WAS FROM ADR #2; SO NEITHER PLT'S ALTIMETER WAS REPRESENTING THE ALT BEING SENT TO ATC. RECOMMEND THE MEL PLACARD BE UPDATED TO SELECT XPONDER POS TO #1 IN THIS CASE.
Data retrieved from NASA's ASRS site as of January 2009 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.