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Flight crew of an light transport forgot to reset their altimeters at FL180 causing them to be below assigned altitude for about 20 mins.
| Attributes | |
| ACN | 352910 |
| Time | |
| Date | 199611 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : tlh |
| State Reference | FL |
| Altitude | msl bound lower : 17500 msl bound upper : 18000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 3000 flight time type : 180 |
| ASRS Report | 352910 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot non adherence : clearance other anomaly other |
| Independent Detector | 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:
Upon reaching FL180 we never reset our altimeters to 29.92. After flying level at FL180 for probably 20 mins we noticed that we had not reset them and we did. The result was that we were really flying at 17500 ft. The captain noticed that we forgot to reset our altimeters. ATC never said anything to us about incident. We didn't say anything either of course.
Original NASA ASRS Text
Title: FLC OF AN LTT FORGOT TO RESET THEIR ALTIMETERS AT FL180 CAUSING THEM TO BE BELOW ASSIGNED ALT FOR ABOUT 20 MINS.
Narrative: UPON REACHING FL180 WE NEVER RESET OUR ALTIMETERS TO 29.92. AFTER FLYING LEVEL AT FL180 FOR PROBABLY 20 MINS WE NOTICED THAT WE HAD NOT RESET THEM AND WE DID. THE RESULT WAS THAT WE WERE REALLY FLYING AT 17500 FT. THE CAPT NOTICED THAT WE FORGOT TO RESET OUR ALTIMETERS. ATC NEVER SAID ANYTHING TO US ABOUT INCIDENT. WE DIDN'T SAY ANYTHING EITHER OF COURSE.
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.