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Flight crew of a B767 diverted to nearby alternate at night for availability of a longer runway for landing with only partial flaps due to system malfunction.
| Attributes | |
| ACN | 400858 |
| Time | |
| Date | 199805 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : lga |
| State Reference | NY |
| Altitude | agl bound lower : 2000 agl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : lga tower : mem |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 15000 flight time type : 400 |
| ASRS Report | 400858 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Adp (air demand pump) was maintenance deferred. This pump assists 2 electric central system pumps in the system that pwrs (among other things) gear/flap extension/retraction. When landing flaps (30 degrees) were selected (from 25 degree position) flaps retracted. They stopped at 20 degrees. We initiated go around and diverted to jfk due to longer runway. Flaps and gear were left in position and a flaps 20 degree landing was made. I question the wisdom of allowing dispatch with an inoperative hydraulic pump in such an important system (center) on the B767. I believe that the electric pumps could not handle the demand. Although we may have gotten 30 degrees (landing) flaps with the alternate system, I felt it was prudent to divert to a 14000 ft runway instead of landing on a 7000 ft runway with a broken airplane. Also, 20 degree flaps is single engine setting, so I knew it was a safe landing setting.
Original NASA ASRS Text
Title: FLC OF A B767 DIVERTED TO NEARBY ALTERNATE AT NIGHT FOR AVAILABILITY OF A LONGER RWY FOR LNDG WITH ONLY PARTIAL FLAPS DUE TO SYS MALFUNCTION.
Narrative: ADP (AIR DEMAND PUMP) WAS MAINT DEFERRED. THIS PUMP ASSISTS 2 ELECTRIC CENTRAL SYS PUMPS IN THE SYS THAT PWRS (AMONG OTHER THINGS) GEAR/FLAP EXTENSION/RETRACTION. WHEN LNDG FLAPS (30 DEGS) WERE SELECTED (FROM 25 DEG POS) FLAPS RETRACTED. THEY STOPPED AT 20 DEGS. WE INITIATED GAR AND DIVERTED TO JFK DUE TO LONGER RWY. FLAPS AND GEAR WERE LEFT IN POS AND A FLAPS 20 DEG LNDG WAS MADE. I QUESTION THE WISDOM OF ALLOWING DISPATCH WITH AN INOP HYD PUMP IN SUCH AN IMPORTANT SYS (CTR) ON THE B767. I BELIEVE THAT THE ELECTRIC PUMPS COULD NOT HANDLE THE DEMAND. ALTHOUGH WE MAY HAVE GOTTEN 30 DEGS (LNDG) FLAPS WITH THE ALTERNATE SYS, I FELT IT WAS PRUDENT TO DIVERT TO A 14000 FT RWY INSTEAD OF LNDG ON A 7000 FT RWY WITH A BROKEN AIRPLANE. ALSO, 20 DEG FLAPS IS SINGLE ENG SETTING, SO I KNEW IT WAS A SAFE LNDG SETTING.
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.