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Altitude deviation altitude overshot -- air carrier crew descends below assigned altitude, but returns to the proper altitude quickly.
| Attributes | |
| ACN | 309710 |
| Time | |
| Date | 199507 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : phx |
| State Reference | AZ |
| Altitude | msl bound lower : 8750 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : phx |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 120 flight time total : 7000 flight time type : 2500 |
| ASRS Report | 309710 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 24 flight time total : 5800 flight time type : 24 |
| ASRS Report | 310043 |
| Events | |
| Anomaly | altitude deviation : overshoot inflight encounter : weather non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified 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:
En route from tucson to phoenix, second leg of trip sequence, first officer was on first flight off IOE. First officer was flying with the autoplt engaged. We were deviating around large cells which we could see clearly. We were on descent from 11000 ft to 9000 ft on a vector heading. About 9100 ft I noticed there was still a high descent rate. I called out 'altitude' to the first officer. We descended through 9000 ft with both pilots pulling back on the yoke. We stopped the descent at 8750 ft and quickly climbed back to the assigned altitude. First officer had intended to push altitude select button for automatic capture, but hadn't. Contributing to this error is that only 25 percent of our 727 fleet has this feature. The rest of the autoplts must be manually operated with a rate knob to capture. (Ie, no capture).
Original NASA ASRS Text
Title: ALTDEV ALT OVERSHOT -- ACR CREW DSNDS BELOW ASSIGNED ALT, BUT RETURNS TO THE PROPER ALT QUICKLY.
Narrative: ENRTE FROM TUCSON TO PHOENIX, SECOND LEG OF TRIP SEQUENCE, FO WAS ON FIRST FLT OFF IOE. FO WAS FLYING WITH THE AUTOPLT ENGAGED. WE WERE DEVIATING AROUND LARGE CELLS WHICH WE COULD SEE CLRLY. WE WERE ON DSCNT FROM 11000 FT TO 9000 FT ON A VECTOR HDG. ABOUT 9100 FT I NOTICED THERE WAS STILL A HIGH DSCNT RATE. I CALLED OUT 'ALT' TO THE FO. WE DSNDED THROUGH 9000 FT WITH BOTH PLTS PULLING BACK ON THE YOKE. WE STOPPED THE DSCNT AT 8750 FT AND QUICKLY CLBED BACK TO THE ASSIGNED ALT. FO HAD INTENDED TO PUSH ALT SELECT BUTTON FOR AUTO CAPTURE, BUT HADN'T. CONTRIBUTING TO THIS ERROR IS THAT ONLY 25 PERCENT OF OUR 727 FLEET HAS THIS FEATURE. THE REST OF THE AUTOPLTS MUST BE MANUALLY OPERATED WITH A RATE KNOB TO CAPTURE. (IE, NO CAPTURE).
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.