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A B737-300 PIC returns from the lavatory and enters into a confusing discussion on the altitude crossing restr that ATC had assigned the first officer in his absence, ZBW, ma.
| Attributes | |
| ACN | 460860 |
| Time | |
| Date | 200001 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : raalf |
| State Reference | CT |
| Altitude | msl single value : 24000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Ice |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 17000 flight time type : 3000 |
| ASRS Report | 460860 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overrode automation flight crew : became reoriented |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
While I was out of the cockpit during a lavatory break, the first officer was given a crossing restr to cross 30 NM southwest of raalf at FL240. The first officer took the aircraft out of VNAV and put the new altitude in the altitude window. At first, there was a short discussion and confusion on the crossing restr when I returned to the cockpit. I then took control of the aircraft and put the new restr in the FMC but did not notice that the VNAV had been disengaged. Once I discovered that the aircraft was not descending, I placed the aircraft on level change and descended rapidly. I relayed to ATC that we were descending but that we may not make the restr. We did make the restr but ATC said they made a couple of calls to the next controller just in case we did not.
Original NASA ASRS Text
Title: A B737-300 PIC RETURNS FROM THE LAVATORY AND ENTERS INTO A CONFUSING DISCUSSION ON THE ALT XING RESTR THAT ATC HAD ASSIGNED THE FO IN HIS ABSENCE, ZBW, MA.
Narrative: WHILE I WAS OUT OF THE COCKPIT DURING A LAVATORY BREAK, THE FO WAS GIVEN A XING RESTR TO CROSS 30 NM SW OF RAALF AT FL240. THE FO TOOK THE ACFT OUT OF VNAV AND PUT THE NEW ALT IN THE ALT WINDOW. AT FIRST, THERE WAS A SHORT DISCUSSION AND CONFUSION ON THE XING RESTR WHEN I RETURNED TO THE COCKPIT. I THEN TOOK CTL OF THE ACFT AND PUT THE NEW RESTR IN THE FMC BUT DID NOT NOTICE THAT THE VNAV HAD BEEN DISENGAGED. ONCE I DISCOVERED THAT THE ACFT WAS NOT DSNDING, I PLACED THE ACFT ON LEVEL CHANGE AND DSNDED RAPIDLY. I RELAYED TO ATC THAT WE WERE DSNDING BUT THAT WE MAY NOT MAKE THE RESTR. WE DID MAKE THE RESTR BUT ATC SAID THEY MADE A COUPLE OF CALLS TO THE NEXT CTLR JUST IN CASE WE DID NOT.
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.