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A B737-300 departing las was notified by ZLA he was 200-300 ft low of FL310 assigned altitude. Crew discovered their altimeters had not been set to 29.92 climbing out of FL180.
| Attributes | |
| ACN | 715188 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zla.artcc |
| State Reference | LA |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 63 flight time type : 5052 |
| ASRS Report | 715188 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : undershoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to assigned altitude other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Flying at FL310 on the las cowby departure; ZLA advised our altitude readout on their equipment was reading between FL307 and FL308. I discovered we never reset our altimeters to 29.92 while we climbed through FL180. I reset my altimeter to 29.92. ZLA advised our mode C was reporting correctly before they gave us a frequency change.
Original NASA ASRS Text
Title: A B737-300 DEPARTING LAS WAS NOTIFIED BY ZLA HE WAS 200-300 FT LOW OF FL310 ASSIGNED ALT. CREW DISCOVERED THEIR ALTIMETERS HAD NOT BEEN SET TO 29.92 CLBING OUT OF FL180.
Narrative: FLYING AT FL310 ON THE LAS COWBY DEP; ZLA ADVISED OUR ALT READOUT ON THEIR EQUIP WAS READING BTWN FL307 AND FL308. I DISCOVERED WE NEVER RESET OUR ALTIMETERS TO 29.92 WHILE WE CLBED THROUGH FL180. I RESET MY ALTIMETER TO 29.92. ZLA ADVISED OUR MODE C WAS RPTING CORRECTLY BEFORE THEY GAVE US A FREQ CHANGE.
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.