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Flight crew of a B727 descended below assigned altitude due to the autoplt not holding selected altitude. Captain observed descent and corrected back at once.
| Attributes | |
| ACN | 385350 |
| Time | |
| Date | 199711 |
| Day | Wed |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : alo |
| State Reference | IA |
| Altitude | msl bound lower : 27700 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tower : myf |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | other other : other pilot : cfi pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 85 flight time total : 14000 flight time type : 4000 |
| ASRS Report | 385350 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude 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:
Aircraft had descended on autoplt to FL280. Leveled off and captured 28000 ft and cruise power reapplied. After about 3 mins, aircraft descended to about 27700 ft when it was discovered and immediately corrected. This occurred during a frequency change. Another reminder to always monitor aircraft even when the autoplt 'has it.'
Original NASA ASRS Text
Title: FLC OF A B727 DSNDED BELOW ASSIGNED ALT DUE TO THE AUTOPLT NOT HOLDING SELECTED ALT. CAPT OBSERVED DSCNT AND CORRECTED BACK AT ONCE.
Narrative: ACFT HAD DSNDED ON AUTOPLT TO FL280. LEVELED OFF AND CAPTURED 28000 FT AND CRUISE PWR REAPPLIED. AFTER ABOUT 3 MINS, ACFT DSNDED TO ABOUT 27700 FT WHEN IT WAS DISCOVERED AND IMMEDIATELY CORRECTED. THIS OCCURRED DURING A FREQ CHANGE. ANOTHER REMINDER TO ALWAYS MONITOR ACFT EVEN WHEN THE AUTOPLT 'HAS IT.'
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.