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Altitude deviation occurs during a coupled approach in a GLF5 cpr aircraft on ILS approach to runway 5 at ewr, nj.
| Attributes | |
| ACN | 561810 |
| Time | |
| Date | 200210 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : teb.airport |
| State Reference | NJ |
| Altitude | msl bound lower : 2000 msl bound upper : 2600 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Gulfstream V |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | ils localizer & glide slope : 6 other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 8000 flight time type : 95 |
| ASRS Report | 561810 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to assigned altitude flight crew : became reoriented |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were being vectored for localizer intercept at 2000 ft. I had selected 'approach' mode while on autoplt and was waiting for localizer intercept from about a 35 degree vector angle to the inbound course. At a distance of about 9 mi the ILS signal apparently became momentarily intermittent as I saw the needles shift around but then settle down. This momentary loss of signal must have uncoupled my altitude hold as the plane gradually climbed to 2600 ft. I believe the autoplt was now seeking the GS which was above us at this distance. It is worth noting that numerous buildings on somewhat higher terrain were between us and the runway at that distance and offset. Also no altitude alert chime was heard when the plane deviated from 2000 ft. My scan of basic flight parameters is now more frequent and I am less trusting of our very modern 'automatic' airplane.
Original NASA ASRS Text
Title: ALTDEV OCCURS DURING A COUPLED APCH IN A GLF5 CPR ACFT ON ILS APCH TO RWY 5 AT EWR, NJ.
Narrative: WE WERE BEING VECTORED FOR LOC INTERCEPT AT 2000 FT. I HAD SELECTED 'APCH' MODE WHILE ON AUTOPLT AND WAS WAITING FOR LOC INTERCEPT FROM ABOUT A 35 DEG VECTOR ANGLE TO THE INBOUND COURSE. AT A DISTANCE OF ABOUT 9 MI THE ILS SIGNAL APPARENTLY BECAME MOMENTARILY INTERMITTENT AS I SAW THE NEEDLES SHIFT AROUND BUT THEN SETTLE DOWN. THIS MOMENTARY LOSS OF SIGNAL MUST HAVE UNCOUPLED MY ALT HOLD AS THE PLANE GRADUALLY CLBED TO 2600 FT. I BELIEVE THE AUTOPLT WAS NOW SEEKING THE GS WHICH WAS ABOVE US AT THIS DISTANCE. IT IS WORTH NOTING THAT NUMEROUS BUILDINGS ON SOMEWHAT HIGHER TERRAIN WERE BTWN US AND THE RWY AT THAT DISTANCE AND OFFSET. ALSO NO ALT ALERT CHIME WAS HEARD WHEN THE PLANE DEVIATED FROM 2000 FT. MY SCAN OF BASIC FLT PARAMETERS IS NOW MORE FREQUENT AND I AM LESS TRUSTING OF OUR VERY MODERN 'AUTOMATIC' AIRPLANE.
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.