37000 Feet

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When they were given vectors for the ILS runway 6 at teb the flight crew of a hawker horizon selected the 'activate vectors' mode of the honeywell FMS; which removed the fix prior to the FAF; dandy--which has a mandatory crossing at 1;500 MSL--from the display. They continued at their previously assigned 2;000 MSL; unaware of the need to cross the fix at the required altitude. ATC caught the impending error and advised the crew of the need to descend.

Narrative:

Approach cleared us direct to vings; 2;000 MSL and 210 KIAS. Prior to vings; approach changed the clearance to an assigned heading or 090; maintain 2;000 ft until established; cleared for the ILS 6 at teb. Since we were on an assigned heading to intercept the localizer we accepted the act (activate) vectors - yes feature of the honeywell FMS which 'cleans up' the navigation display; depicts the localizer course and torby (FAF) was the next fix displayed. We intercepted the localizer course; maintaining 2;000 and were preparing for glideslope intercept when ny approach indicated we should be over dandy at 1;500 and to descend to 1;500. Dandy was not available for reference nor displayed. We began an immediate descent to 1;500 intercepted the glide slope; completed the approach and landing uneventfully.to ensure recollection and compliance with mandatory altitude constraints this information should be included in the notes and/or plan view sections of the associated approach charts. Also; diligent crew awareness and coordination is required when the FMS; displays no longer depict the fix/altitude and DME (raw data) is the only available remaining reference for dandy.

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Original NASA ASRS Text

Title: When they were given vectors for the ILS Runway 6 at TEB the flight crew of a Hawker Horizon selected the 'Activate Vectors' mode of the Honeywell FMS; which removed the fix prior to the FAF; DANDY--which has a mandatory crossing at 1;500 MSL--from the display. They continued at their previously assigned 2;000 MSL; unaware of the need to cross the fix at the required altitude. ATC caught the impending error and advised the crew of the need to descend.

Narrative: Approach cleared us direct to VINGS; 2;000 MSL and 210 KIAS. Prior to VINGS; Approach changed the clearance to an assigned heading or 090; maintain 2;000 FT until established; cleared for the ILS 6 at TEB. Since we were on an assigned heading to intercept the localizer we accepted the ACT (activate) VECTORS - YES feature of the Honeywell FMS which 'cleans up' the navigation display; depicts the localizer course and TORBY (FAF) was the next fix displayed. We intercepted the localizer course; maintaining 2;000 and were preparing for glideslope intercept when NY Approach indicated we should be over DANDY at 1;500 and to descend to 1;500. DANDY was not available for reference nor displayed. We began an immediate descent to 1;500 intercepted the glide slope; completed the approach and landing uneventfully.To ensure recollection and compliance with mandatory altitude constraints this information should be included in the Notes and/or Plan View sections of the associated approach charts. Also; diligent crew awareness and coordination is required when the FMS; displays no longer depict the fix/altitude and DME (raw data) is the only available remaining reference for DANDY.

Data retrieved from NASA's ASRS site as of July 2013 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.