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Spi TRACON controller reported an aircraft on final approach slowed unexpectedly causing them to have insufficient spacing on final.
| Attributes | |
| ACN | 1508637 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | SPI.Airport |
| State Reference | IL |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | F/A 18 Hornet/Super Hornet |
| Flight Phase | Final Approach Initial Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 20 |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Procedural Published Material / Policy Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
A snow shower had just moved over the airport and was continuing towards the final of the arrival aircraft. Visibility was reduced to about 4 miles. The cloud layer was lowering to a point where the visual approach was going to be questionable. I wanted to give the two aircraft an ILS approach. The two aircraft insisted on a visual approach. The weather was above visual minimums; so both aircraft where on vectors to initial to the same runway. When the first aircraft was talking to the tower; he slowed more than an F18 going to initial should. The second F18 unexpectedly increased his speed to 400 knots and caught the lead aircraft on final.I think what happened was the first aircraft slowed down to land instead of going to initial. Which was 60 knots slower than expected. The second aircraft increased his speed 170 knots more than expected. The pilots need to explain their operation to air traffic better or take our speed restrictions.
Original NASA ASRS Text
Title: SPI TRACON Controller reported an aircraft on final approach slowed unexpectedly causing them to have insufficient spacing on final.
Narrative: A snow shower had just moved over the airport and was continuing towards the final of the arrival aircraft. Visibility was reduced to about 4 miles. The cloud layer was lowering to a point where the Visual Approach was going to be questionable. I wanted to give the two aircraft an ILS approach. The two aircraft insisted on a Visual Approach. The weather was above visual minimums; so both aircraft where on vectors to initial to the same runway. When the first aircraft was talking to the Tower; he slowed more than an F18 going to initial should. The second F18 unexpectedly increased his speed to 400 knots and caught the lead aircraft on final.I think what happened was the first aircraft slowed down to land instead of going to initial. Which was 60 knots slower than expected. The second aircraft increased his speed 170 knots more than expected. The pilots need to explain their operation to air traffic better or take our speed restrictions.
Data retrieved from NASA's ASRS site 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.