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Flight crew of an light transport air carrier aircraft were directed to make an immediate turn by ATC to avoid another aircraft with an instrument malfunction resulting in losing altitude in the steeply banked turn.
| Attributes | |
| ACN | 258292 |
| Time | |
| Date | 199312 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sux |
| State Reference | IA |
| Altitude | msl bound lower : 2700 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sux |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 245 flight time total : 2450 flight time type : 1600 |
| ASRS Report | 258292 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 18000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approach control cleared us to 3000 ft, intercept ILS 31 localizer and track inbound, reduce speed to 210 KIAS. We were following an small aircraft sel Y on the approach. At approximately 6 NM from the OM, approach control told us to 'immediately' turn left to a heading of 270 degrees. The captain banked the aircraft to approximately 60 degrees thus losing about 300 ft in the attempt to maintain altitude and above normal g-forces occurred. Upon questioning the controller, the response was: an aircraft was heading directly at us at 3000 ft. The small aircraft Y on the approach had lost gyroscopes and was disoriented. Situation could have been avoided with proper transition to wet compass.
Original NASA ASRS Text
Title: FLC OF AN LTT ACR ACFT WERE DIRECTED TO MAKE AN IMMEDIATE TURN BY ATC TO AVOID ANOTHER ACFT WITH AN INST MALFUNCTION RESULTING IN LOSING ALT IN THE STEEPLY BANKED TURN.
Narrative: APCH CTL CLRED US TO 3000 FT, INTERCEPT ILS 31 LOC AND TRACK INBOUND, REDUCE SPD TO 210 KIAS. WE WERE FOLLOWING AN SMA SEL Y ON THE APCH. AT APPROX 6 NM FROM THE OM, APCH CTL TOLD US TO 'IMMEDIATELY' TURN L TO A HDG OF 270 DEGS. THE CAPT BANKED THE ACFT TO APPROX 60 DEGS THUS LOSING ABOUT 300 FT IN THE ATTEMPT TO MAINTAIN ALT AND ABOVE NORMAL G-FORCES OCCURRED. UPON QUESTIONING THE CTLR, THE RESPONSE WAS: AN ACFT WAS HDG DIRECTLY AT US AT 3000 FT. THE SMA Y ON THE APCH HAD LOST GYROSCOPES AND WAS DISORIENTED. SIT COULD HAVE BEEN AVOIDED WITH PROPER TRANSITION TO WET COMPASS.
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.