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An medium large transport air carrier crew, in the WX, got confused with their QFE qnh procedures and overshot their assigned altitude on descent.
| Attributes | |
| ACN | 210754 |
| Time | |
| Date | 199205 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bur |
| State Reference | CA |
| Altitude | agl bound lower : 2500 agl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bur tower : bur tower : jfk |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 3000 flight time type : 200 |
| ASRS Report | 210754 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 9000 flight time type : 1400 |
| ASRS Report | 211135 |
| Events | |
| Anomaly | altitude deviation : overshoot |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While hand-flying the approach, flight director bars indicated 'on glide path.' did not cross reference raw data which would have shown that the flight director had not locked onto the ILS. Became confused when I referenced the 2 altimeters (QFE vs qnh), requiring 10-15 seconds to figure out what was going on. Had descended about 500 ft below glide path when a recovery was initiated. Landed without incident. TCASII showed no conflict. Supplemental information from acn 211135: first officer got confused by qnh and QFE altimeters. He was following the flight director v-bars with not GS capture and descended below the GS about 500 ft low before recovery was started.
Original NASA ASRS Text
Title: AN MLG ACR CREW, IN THE WX, GOT CONFUSED WITH THEIR QFE QNH PROCS AND OVERSHOT THEIR ASSIGNED ALT ON DSCNT.
Narrative: WHILE HAND-FLYING THE APCH, FLT DIRECTOR BARS INDICATED 'ON GLIDE PATH.' DID NOT CROSS REF RAW DATA WHICH WOULD HAVE SHOWN THAT THE FLT DIRECTOR HAD NOT LOCKED ONTO THE ILS. BECAME CONFUSED WHEN I REFED THE 2 ALTIMETERS (QFE VS QNH), REQUIRING 10-15 SECONDS TO FIGURE OUT WHAT WAS GOING ON. HAD DSNDED ABOUT 500 FT BELOW GLIDE PATH WHEN A RECOVERY WAS INITIATED. LANDED WITHOUT INCIDENT. TCASII SHOWED NO CONFLICT. SUPPLEMENTAL INFO FROM ACN 211135: FO GOT CONFUSED BY QNH AND QFE ALTIMETERS. HE WAS FOLLOWING THE FLT DIRECTOR V-BARS WITH NOT GS CAPTURE AND DSNDED BELOW THE GS ABOUT 500 FT LOW BEFORE RECOVERY WAS STARTED.
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.