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Air carrier large transport flight crew complaint of nearly missing crossing altitude restriction because of company duty rest cycle scheduling procedure.
| Attributes | |
| ACN | 93374 |
| Time | |
| Date | 198808 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : hnk |
| State Reference | NY |
| Altitude | msl bound lower : 25000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw tower : dca |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : j68 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer |
| Experience | flight time total : 1700 |
| ASRS Report | 93374 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
We were eastbound on the 093 degree right from hnk and were given a clearance to cross 45 DME east of hnk at FL290. The captain started the descent normally. As we were nearing 45 DME, the first officer asked the captain if he was going to make the restriction. The captain then realized we would not make it at the present rate of descent and increased our rate of descent. This incident was a direct result of the very difficult trip pairing we were flying. The trip sequence was for aug with air carrier. Report time the first day was XA56 (day 1) we flew 3 legs and arrived mexico city at XI33L day 1. We then tried to sleep in the middle of the day and reported for the second day at XT55 day 1 for a trip to chicago with a planned arrival at XA40 day 2. We then left chicago at XC20 day 2 to arrive in providence at XE56 day 2. This incident occurred on the chicago-providence leg. The abnormal sleep-work schedule was a direct cause of the near altitude deviation due to reduced alertness.
Original NASA ASRS Text
Title: ACR LGT FLT CREW COMPLAINT OF NEARLY MISSING CROSSING ALT RESTRICTION BECAUSE OF COMPANY DUTY REST CYCLE SCHEDULING PROC.
Narrative: WE WERE EBND ON THE 093 DEG R FROM HNK AND WERE GIVEN A CLRNC TO CROSS 45 DME E OF HNK AT FL290. THE CAPT STARTED THE DSCNT NORMALLY. AS WE WERE NEARING 45 DME, THE F/O ASKED THE CAPT IF HE WAS GOING TO MAKE THE RESTRICTION. THE CAPT THEN REALIZED WE WOULD NOT MAKE IT AT THE PRESENT RATE OF DSCNT AND INCREASED OUR RATE OF DSCNT. THIS INCIDENT WAS A DIRECT RESULT OF THE VERY DIFFICULT TRIP PAIRING WE WERE FLYING. THE TRIP SEQUENCE WAS FOR AUG WITH ACR. RPT TIME THE FIRST DAY WAS XA56 (DAY 1) WE FLEW 3 LEGS AND ARRIVED MEXICO CITY AT XI33L DAY 1. WE THEN TRIED TO SLEEP IN THE MIDDLE OF THE DAY AND RPTED FOR THE SECOND DAY AT XT55 DAY 1 FOR A TRIP TO CHICAGO WITH A PLANNED ARR AT XA40 DAY 2. WE THEN LEFT CHICAGO AT XC20 DAY 2 TO ARRIVE IN PROVIDENCE AT XE56 DAY 2. THIS INCIDENT OCCURRED ON THE CHICAGO-PROVIDENCE LEG. THE ABNORMAL SLEEP-WORK SCHEDULE WAS A DIRECT CAUSE OF THE NEAR ALT DEVIATION DUE TO REDUCED ALERTNESS.
Data retrieved from NASA's ASRS site as of August 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.