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Flight crew of an medium large transport descended below the published step-down altitude during a localizer approach due to speed and traffic adjustments.
| Attributes | |
| ACN | 339610 |
| Time | |
| Date | 199606 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : yyz |
| State Reference | ON |
| Altitude | msl bound lower : 2000 msl bound upper : 2200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : yyz |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 17000 flight time type : 6000 |
| ASRS Report | 339610 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met non adherence : clearance non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During ILS (localizer) approach in visual conditions to toronto runway 33, alder intersection crossed at 2600 ft. Descent was begun and altitude over OM (lima) may have been slightly lower than published altitude for GS inoperative approach. Conditions affecting operation: 1) assigned airspeed adjustments on final, 2) spacing on traffic ahead, 3) spacing on traffic behind us, 4) busy air traffic controller. We had visual contact with the runway, the VASI, and the traffic. An apparent normal descent was accomplished in the visual meteorological conditions.
Original NASA ASRS Text
Title: FLC OF AN MLG DSNDED BELOW THE PUBLISHED STEP-DOWN ALT DURING A LOC APCH DUE TO SPD AND TFC ADJUSTMENTS.
Narrative: DURING ILS (LOC) APCH IN VISUAL CONDITIONS TO TORONTO RWY 33, ALDER INTXN CROSSED AT 2600 FT. DSCNT WAS BEGUN AND ALT OVER OM (LIMA) MAY HAVE BEEN SLIGHTLY LOWER THAN PUBLISHED ALT FOR GS INOP APCH. CONDITIONS AFFECTING OP: 1) ASSIGNED AIRSPD ADJUSTMENTS ON FINAL, 2) SPACING ON TFC AHEAD, 3) SPACING ON TFC BEHIND US, 4) BUSY AIR TFC CTLR. WE HAD VISUAL CONTACT WITH THE RWY, THE VASI, AND THE TFC. AN APPARENT NORMAL DSCNT WAS ACCOMPLISHED IN THE VISUAL METEOROLOGICAL CONDITIONS.
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.