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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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The flight crew of an large transport cargo flight discovered that they were too low when they received a radar altimeter 1000 ft call. While the crew was climbing to a higher altitude, the approach controller intervened. Altitude deviation altitude overshot.
| Attributes | |
| ACN | 326480 |
| Time | |
| Date | 199601 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : atw |
| State Reference | WI |
| Altitude | msl bound lower : 2000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau tracon : grb |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 13000 flight time type : 2000 |
| ASRS Report | 326480 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 80 flight time total : 9200 flight time type : 105 |
| ASRS Report | 326511 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On an IFR flight from mke to atw, we were at cruise at 12000 ft. We were talking to ZAU. They gave us discretion to 10000 ft. Having started our descent, they then gave us discretion to 4000 ft. Passing through about 7000 ft they gave us descent to 2000 ft. At this time they handed us over to grb approach. We continued down and leveled at 2000 ft. Leveling, we got a 1000 ft call on the radar altimeter. Right at this time grb approach came back to verify our altitude. I had told them we received 2000 ft from ZAU. I remember all my readbacks for every descent and remember clearly what I had said. Anyway, we were already in a climb to 3000 ft when we heard our radar altimeter callout 1000 ft. Grb approach said no problem. Nothing was said. I had little sleep the following day due to a noisy hotel. Supplemental information from acn 326511: problem arose due to miscom between crew and ZAU. Discovered by visual perception of being too low and radar altimeter voicing 1000 ft while approach control simultaneously stated that the assigned altitude was 3000 ft.
Original NASA ASRS Text
Title: THE FLC OF AN LGT CARGO FLT DISCOVERED THAT THEY WERE TOO LOW WHEN THEY RECEIVED A RADAR ALTIMETER 1000 FT CALL. WHILE THE CREW WAS CLBING TO A HIGHER ALT, THE APCH CTLR INTERVENED. ALTDEV ALT OVERSHOT.
Narrative: ON AN IFR FLT FROM MKE TO ATW, WE WERE AT CRUISE AT 12000 FT. WE WERE TALKING TO ZAU. THEY GAVE US DISCRETION TO 10000 FT. HAVING STARTED OUR DSCNT, THEY THEN GAVE US DISCRETION TO 4000 FT. PASSING THROUGH ABOUT 7000 FT THEY GAVE US DSCNT TO 2000 FT. AT THIS TIME THEY HANDED US OVER TO GRB APCH. WE CONTINUED DOWN AND LEVELED AT 2000 FT. LEVELING, WE GOT A 1000 FT CALL ON THE RADAR ALTIMETER. RIGHT AT THIS TIME GRB APCH CAME BACK TO VERIFY OUR ALT. I HAD TOLD THEM WE RECEIVED 2000 FT FROM ZAU. I REMEMBER ALL MY READBACKS FOR EVERY DSCNT AND REMEMBER CLRLY WHAT I HAD SAID. ANYWAY, WE WERE ALREADY IN A CLB TO 3000 FT WHEN WE HEARD OUR RADAR ALTIMETER CALLOUT 1000 FT. GRB APCH SAID NO PROB. NOTHING WAS SAID. I HAD LITTLE SLEEP THE FOLLOWING DAY DUE TO A NOISY HOTEL. SUPPLEMENTAL INFO FROM ACN 326511: PROB AROSE DUE TO MISCOM BTWN CREW AND ZAU. DISCOVERED BY VISUAL PERCEPTION OF BEING TOO LOW AND RADAR ALTIMETER VOICING 1000 FT WHILE APCH CTL SIMULTANEOUSLY STATED THAT THE ASSIGNED ALT WAS 3000 FT.
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.