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Air carrier cargo operation dispatch with autothrottles inoperative. Descending into mem allowed IAS to exceed 250 KTS below 10000 ft. Was at 280 IAS at 9600 ft. No comment from controller. Recently checked out on the aircraft and in training emphasis was on autoflt system.
| Attributes | |
| ACN | 353480 |
| Time | |
| Date | 199611 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mem |
| State Reference | TN |
| Altitude | msl bound lower : 9600 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mem |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| 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 : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 70 flight time total : 12700 flight time type : 70 |
| ASRS Report | 353480 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : far non adherence : published procedure other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending into mem, aircraft in question was dispatched with an inoperative autothrottle system, which requires manual manipulation of the throttles. When cleared below 10000 ft, airspeed was inadvertently allowed to exceed 250 KTS (280 KTS) by 300- 400 ft (9700-9600 ft MSL). This was probably caused by an over reliance on the autothrottle system (that was not functioning) and being temporarily distraction by a vector to a runway we weren't expecting. There was no conflict, ATC did not say anything. I am new to this airplane, and through training there was so much emphasis (reliance) on the autoflt system that when a portion reverts to manual you have to be on guard to make sure that the aircraft is still flown to the correct parameters.
Original NASA ASRS Text
Title: ACR CARGO OP DISPATCH WITH AUTOTHROTTLES INOP. DSNDING INTO MEM ALLOWED IAS TO EXCEED 250 KTS BELOW 10000 FT. WAS AT 280 IAS AT 9600 FT. NO COMMENT FROM CTLR. RECENTLY CHKED OUT ON THE ACFT AND IN TRAINING EMPHASIS WAS ON AUTOFLT SYS.
Narrative: DSNDING INTO MEM, ACFT IN QUESTION WAS DISPATCHED WITH AN INOP AUTOTHROTTLE SYS, WHICH REQUIRES MANUAL MANIPULATION OF THE THROTTLES. WHEN CLRED BELOW 10000 FT, AIRSPD WAS INADVERTENTLY ALLOWED TO EXCEED 250 KTS (280 KTS) BY 300- 400 FT (9700-9600 FT MSL). THIS WAS PROBABLY CAUSED BY AN OVER RELIANCE ON THE AUTOTHROTTLE SYS (THAT WAS NOT FUNCTIONING) AND BEING TEMPORARILY DISTR BY A VECTOR TO A RWY WE WEREN'T EXPECTING. THERE WAS NO CONFLICT, ATC DID NOT SAY ANYTHING. I AM NEW TO THIS AIRPLANE, AND THROUGH TRAINING THERE WAS SO MUCH EMPHASIS (RELIANCE) ON THE AUTOFLT SYS THAT WHEN A PORTION REVERTS TO MANUAL YOU HAVE TO BE ON GUARD TO MAKE SURE THAT THE ACFT IS STILL FLOWN TO THE CORRECT PARAMETERS.
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.