 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B727 level at 11000 ft thought altitude hold on autoplt was engaged. Controller advised altitude 10600 ft. Regained assigned altitude. No light indication that altitude hold is engaged on this autoplt. May have not been armed when initially engaged.
| Attributes | |
| ACN | 357120 |
| Time | |
| Date | 199612 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 10600 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 230 flight time type : 6000 |
| ASRS Report | 357120 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Leveled at 11000 ft and told to slow to 210 KIAS from 250 KIAS. Leveled aircraft at 11000 ft put on altitude hold on autoplt and was watching airspeed bleed off when approach control called and told us we were at 10600 ft. We immediately climbed to 11000 ft with no incident. Block iv autoplt on B727 has no altitude hold indication or light that it is engaged. Altitude hold switch was pushed forward. It may have not engaged properly or disengaged on its own with no cockpit indication of malfunction.
Original NASA ASRS Text
Title: B727 LEVEL AT 11000 FT THOUGHT ALT HOLD ON AUTOPLT WAS ENGAGED. CTLR ADVISED ALT 10600 FT. REGAINED ASSIGNED ALT. NO LIGHT INDICATION THAT ALT HOLD IS ENGAGED ON THIS AUTOPLT. MAY HAVE NOT BEEN ARMED WHEN INITIALLY ENGAGED.
Narrative: LEVELED AT 11000 FT AND TOLD TO SLOW TO 210 KIAS FROM 250 KIAS. LEVELED ACFT AT 11000 FT PUT ON ALT HOLD ON AUTOPLT AND WAS WATCHING AIRSPD BLEED OFF WHEN APCH CTL CALLED AND TOLD US WE WERE AT 10600 FT. WE IMMEDIATELY CLBED TO 11000 FT WITH NO INCIDENT. BLOCK IV AUTOPLT ON B727 HAS NO ALT HOLD INDICATION OR LIGHT THAT IT IS ENGAGED. ALT HOLD SWITCH WAS PUSHED FORWARD. IT MAY HAVE NOT ENGAGED PROPERLY OR DISENGAGED ON ITS OWN WITH NO COCKPIT INDICATION OF MALFUNCTION.
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.