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A B737 crew fails to begin descent in time to comply with a previously given crossing restr. Only 1 pilot was in the cockpit when the clearance was received.
| Attributes | |
| ACN | 632056 |
| Time | |
| Date | 200409 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | intersection : claud |
| State Reference | MI |
| Altitude | msl bound lower : 20000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 632056 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 632054 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met non adherence : company policies non adherence : published procedure non adherence : clearance |
| Independent Detector | other controllerb |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
As we were approaching pmm at FL310, I had gone to the lavatory. While I was out of the cockpit, the first officer received a clearance to cross claud at FL200. He entered the new flight level in the altitude control but did not initiate the descent right away. I returned to the cockpit and the first officer took his turn to the lavatory. I was not aware of the crossing restr until the first officer returned to the cockpit just as ATC told us to start the descent. They also gave us a frequency change. The new ATC controller gave us a new clearance to cross story at 10000 ft, before we had reached claud. We crossed claud at approximately FL240 and made the story clearance. I failed to scan the control panel when I returned to the cockpit which would have prevented this incident. Supplemental information from acn 632054: I was given a clearance to cross claud at FL200. At that time the captain was in the lavatory. When he returned he was not informed of the crossing at claud.
Original NASA ASRS Text
Title: A B737 CREW FAILS TO BEGIN DSCNT IN TIME TO COMPLY WITH A PREVIOUSLY GIVEN XING RESTR. ONLY 1 PLT WAS IN THE COCKPIT WHEN THE CLRNC WAS RECEIVED.
Narrative: AS WE WERE APCHING PMM AT FL310, I HAD GONE TO THE LAVATORY. WHILE I WAS OUT OF THE COCKPIT, THE FO RECEIVED A CLRNC TO CROSS CLAUD AT FL200. HE ENTERED THE NEW FLT LEVEL IN THE ALT CTL BUT DID NOT INITIATE THE DSCNT RIGHT AWAY. I RETURNED TO THE COCKPIT AND THE FO TOOK HIS TURN TO THE LAVATORY. I WAS NOT AWARE OF THE XING RESTR UNTIL THE FO RETURNED TO THE COCKPIT JUST AS ATC TOLD US TO START THE DSCNT. THEY ALSO GAVE US A FREQ CHANGE. THE NEW ATC CTLR GAVE US A NEW CLRNC TO CROSS STORY AT 10000 FT, BEFORE WE HAD REACHED CLAUD. WE CROSSED CLAUD AT APPROX FL240 AND MADE THE STORY CLRNC. I FAILED TO SCAN THE CTL PANEL WHEN I RETURNED TO THE COCKPIT WHICH WOULD HAVE PREVENTED THIS INCIDENT. SUPPLEMENTAL INFO FROM ACN 632054: I WAS GIVEN A CLRNC TO CROSS CLAUD AT FL200. AT THAT TIME THE CAPT WAS IN THE LAVATORY. WHEN HE RETURNED HE WAS NOT INFORMED OF THE XING AT CLAUD.
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.