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B737-300 flight crew inserts wrong temperature into the FMC for reduced takeoff thrust departure rno.
| Attributes | |
| ACN | 697274 |
| Time | |
| Date | 200605 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : rno.airport |
| State Reference | NV |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mgm.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 218 flight time total : 6000 flight time type : 3550 |
| ASRS Report | 697274 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : company policies non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
During takeoff from rno noticed excessive roll and mushy liftoff. Further review of the opc data confirmed that the first officer had put in the wrong temperature for the N1 reduction. Calm wind; 12 degrees; 29.98; zero fuel weight 99745 pounds; takeoff weight 114147 pounds; ATOG 119500 pounds; 116 passenger. The FMC displays the temperature on the N1 page left and right; 36/12. The opc displays the temperature up and down plus the fahrenheit 12C 54F 36C 97F. During the data entry; the first officer input the top line 12/54 instead of the 12/36. During the checklist it looks like the same numbers in the opc and can be easily confused. Solutions: always ensure you look at the opc first; then verify the numbers on the display! This checklist must be accomplished correct every single time or this mistake could occur. Change the format of the opc output page to match the FMC display. I understand we may not be able to change the current opc; but would encourage our next version to match displays.
Original NASA ASRS Text
Title: B737-300 FLT CREW INSERTS WRONG TEMP INTO THE FMC FOR REDUCED TKOF THRUST DEP RNO.
Narrative: DURING TKOF FROM RNO NOTICED EXCESSIVE ROLL AND MUSHY LIFTOFF. FURTHER REVIEW OF THE OPC DATA CONFIRMED THAT THE FO HAD PUT IN THE WRONG TEMP FOR THE N1 REDUCTION. CALM WIND; 12 DEGS; 29.98; ZERO FUEL WT 99745 LBS; TKOF WT 114147 LBS; ATOG 119500 LBS; 116 PAX. THE FMC DISPLAYS THE TEMP ON THE N1 PAGE L AND R; 36/12. THE OPC DISPLAYS THE TEMP UP AND DOWN PLUS THE FAHRENHEIT 12C 54F 36C 97F. DURING THE DATA ENTRY; THE FO INPUT THE TOP LINE 12/54 INSTEAD OF THE 12/36. DURING THE CHKLIST IT LOOKS LIKE THE SAME NUMBERS IN THE OPC AND CAN BE EASILY CONFUSED. SOLUTIONS: ALWAYS ENSURE YOU LOOK AT THE OPC FIRST; THEN VERIFY THE NUMBERS ON THE DISPLAY! THIS CHKLIST MUST BE ACCOMPLISHED CORRECT EVERY SINGLE TIME OR THIS MISTAKE COULD OCCUR. CHANGE THE FORMAT OF THE OPC OUTPUT PAGE TO MATCH THE FMC DISPLAY. I UNDERSTAND WE MAY NOT BE ABLE TO CHANGE THE CURRENT OPC; BUT WOULD ENCOURAGE OUR NEXT VERSION TO MATCH DISPLAYS.
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.