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PIC of a B727 freighter has an altitude deviation during a night operation when using 40 degrees of flaps for the approach. An unexpected speed decay occurred and the delay in adding power created the altitude deviation.
| Attributes | |
| ACN | 384230 |
| Time | |
| Date | 199710 |
| Day | Tue |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : sdf |
| State Reference | KY |
| Altitude | agl bound lower : 2000 agl bound upper : 2500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | controller non radar : 16 controller radar : 16 flight time last 90 days : 10 flight time total : 4600 flight time type : 1200 |
| ASRS Report | 384230 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : far non adherence : published procedure other anomaly 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 other |
Narrative:
Clearance for approach, maintain 2500 ft until GS intercept. This is the situation. We had a minor maintenance problem in which we used 40 degree flaps. This is an abnormal procedure. It slowed aircraft faster than expected. We had to descend visually to increase airspeed. Then, with added power, we climbed back to GS intercept altitude which was 2500 ft. +/-400 ft was lost during this time. No incidences occurred with any other aircraft.
Original NASA ASRS Text
Title: PIC OF A B727 FREIGHTER HAS AN ALTDEV DURING A NIGHT OP WHEN USING 40 DEGS OF FLAPS FOR THE APCH. AN UNEXPECTED SPD DECAY OCCURRED AND THE DELAY IN ADDING PWR CREATED THE ALTDEV.
Narrative: CLRNC FOR APCH, MAINTAIN 2500 FT UNTIL GS INTERCEPT. THIS IS THE SIT. WE HAD A MINOR MAINT PROB IN WHICH WE USED 40 DEG FLAPS. THIS IS AN ABNORMAL PROC. IT SLOWED ACFT FASTER THAN EXPECTED. WE HAD TO DSND VISUALLY TO INCREASE AIRSPD. THEN, WITH ADDED PWR, WE CLBED BACK TO GS INTERCEPT ALT WHICH WAS 2500 FT. +/-400 FT WAS LOST DURING THIS TIME. NO INCIDENCES OCCURRED WITH ANY OTHER ACFT.
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.