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An A320's thrust did not stabilize at 50% N1; therefore the aircraft announced 'retard; retard' at 95 KTS. The takeoff was rejected followed by maintenance action.
| Attributes | |
| ACN | 794934 |
| Time | |
| Date | 200807 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain instruction : instructor observation : company check pilot oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 794934 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer instruction : trainee |
| Events | |
| Anomaly | non adherence : company policies non adherence : far non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : rejected takeoff |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Takeoff runway at ZZZ. First officer/oe student neglected to stabilize engines at 50%. Check airman intervened and stabilized engines. At approximately 95-100 KTS automatic callout 'retard; retard' was heard several times. Not knowing what phase of flight the aircraft was in; a reject was accomplished without incident. Maintenance was unable to explain the problem. After several tests; the write-up was signed off and the flight continued to ZZZ1 without incident. Cause: unknown. This has happened to me on oe's many times. We even practiced these in the simulator. (Ie; student doesn't stabilize at 50%); and I have never seen the aircraft change phases of flight or annunciate 'retard; retard.'
Original NASA ASRS Text
Title: AN A320'S THRUST DID NOT STABILIZE AT 50% N1; THEREFORE THE ACFT ANNOUNCED 'RETARD; RETARD' AT 95 KTS. THE TKOF WAS REJECTED FOLLOWED BY MAINT ACTION.
Narrative: TKOF RWY AT ZZZ. FO/OE STUDENT NEGLECTED TO STABILIZE ENGS AT 50%. CHK AIRMAN INTERVENED AND STABILIZED ENGS. AT APPROX 95-100 KTS AUTO CALLOUT 'RETARD; RETARD' WAS HEARD SEVERAL TIMES. NOT KNOWING WHAT PHASE OF FLT THE ACFT WAS IN; A REJECT WAS ACCOMPLISHED WITHOUT INCIDENT. MAINT WAS UNABLE TO EXPLAIN THE PROB. AFTER SEVERAL TESTS; THE WRITE-UP WAS SIGNED OFF AND THE FLT CONTINUED TO ZZZ1 WITHOUT INCIDENT. CAUSE: UNKNOWN. THIS HAS HAPPENED TO ME ON OE'S MANY TIMES. WE EVEN PRACTICED THESE IN THE SIMULATOR. (IE; STUDENT DOESN'T STABILIZE AT 50%); AND I HAVE NEVER SEEN THE ACFT CHANGE PHASES OF FLT OR ANNUNCIATE 'RETARD; RETARD.'
Data retrieved from NASA's ASRS site as of May 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.