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An airbus 320 at 5000 ft cleared for a tipp toe approach with altitude select set at 1900 ft had the engines accelerate and airspeed increase.
| Attributes | |
| ACN | 563358 |
| Time | |
| Date | 200210 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sfo.airport |
| State Reference | CA |
| Altitude | msl single value : 5000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : nct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : visual arrival star : tipp toe |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 563358 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : undershoot non adherence : clearance non adherence : published procedure other anomaly other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : overrode automation flight crew : returned to assigned altitude flight crew : regained aircraft control |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On approach to sfo, visual conditions, I leveled at 5000 ft and reduced speed with the intent of speeding up to the assigned speed of 220 KTS when cleared to descend. Flaps 1 degree, gear up. We were cleared for the tipp toe visual, altitude window was set at 1900 ft and I pulled the altitude knob. The FMA read open descent and I twisted the airspeed up to 220 KTS. The aircraft didn't descend and sped up as commanded. At about 215 KTS, I confirmed open descent and repulled the altitude knob. The engines continued to accelerate and the airspeed continued to climb. I disconnected the autoplt and autothrottle, pulled the throttles to idle. Speed got to approximately 237 KTS for approximately 3-5 seconds. I have been on this aircraft for 6+ yrs.
Original NASA ASRS Text
Title: AN AIRBUS 320 AT 5000 FT CLRED FOR A TIPP TOE APCH WITH ALT SELECT SET AT 1900 FT HAD THE ENGS ACCELERATE AND AIRSPD INCREASE.
Narrative: ON APCH TO SFO, VISUAL CONDITIONS, I LEVELED AT 5000 FT AND REDUCED SPD WITH THE INTENT OF SPDING UP TO THE ASSIGNED SPD OF 220 KTS WHEN CLRED TO DSND. FLAPS 1 DEG, GEAR UP. WE WERE CLRED FOR THE TIPP TOE VISUAL, ALT WINDOW WAS SET AT 1900 FT AND I PULLED THE ALT KNOB. THE FMA READ OPEN DSCNT AND I TWISTED THE AIRSPD UP TO 220 KTS. THE ACFT DIDN'T DSND AND SPED UP AS COMMANDED. AT ABOUT 215 KTS, I CONFIRMED OPEN DSCNT AND REPULLED THE ALT KNOB. THE ENGS CONTINUED TO ACCELERATE AND THE AIRSPD CONTINUED TO CLB. I DISCONNECTED THE AUTOPLT AND AUTOTHROTTLE, PULLED THE THROTTLES TO IDLE. SPD GOT TO APPROX 237 KTS FOR APPROX 3-5 SECONDS. I HAVE BEEN ON THIS ACFT FOR 6+ YRS.
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.