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Altitude excursion on an ILS approach by an AC690B single pilot when the autoplt electrical power was being interrupted for the second time on approach to crg, fl.
| Attributes | |
| ACN | 542383 |
| Time | |
| Date | 200203 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : crg.airport |
| State Reference | FL |
| Altitude | msl single value : 1400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : crg.tower |
| Operator | general aviation : corporate |
| Make Model Name | Turbo Commander 690C |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | ils localizer & glide slope : 32 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Route In Use | approach : instrument precision |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 112 flight time total : 3640 flight time type : 240 |
| ASRS Report | 542383 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure non adherence other other anomaly other |
| Independent Detector | atc equipment other atc equipment : laws aircraft equipment other aircraft equipment : auto plt trips other controllera other flight crewa |
| Resolutory Action | controller : issued alert flight crew : overrode automation flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
En route from alma VOR (amg) to craig field in jacksonville, fl, the AC690B turbo commander I was flying had an electrical failure. The failure was on the control bus circuitry. I pushed the tie breaker (sub-panel) in. This tie held for 5 mins, then popped. I reset the sub-panel tie breaker and also set the control tie breaker switch overhead. This held with only popping twice. Once on descent into jacksonville, the second time while shooting the ILS runway 32 approach into craig. I had intercepted the localizer inbound (after radar vectoring) at 1900 ft MSL. I was descended down to 1400 ft AGL and was directed to track the localizer inbound and contact craig tower. I was flying on autoplt when the control circuit tripped, turning off the autoplt. As I leaned over to reset breakers, the aircraft descended down from 1400 ft AGL to 900 ft AGL, setting off an altitude alert in the tower. I advised tower of autoplt failure as I was climbing to intercept the GS. We landed without incident. We were in VFR conditions at 1400 ft AGL with 10 mi visibility. Hindsight: should have hand flown to land and reset the control circuit after clearing runway in order to shut down.
Original NASA ASRS Text
Title: ALT EXCURSION ON AN ILS APCH BY AN AC690B SINGLE PLT WHEN THE AUTOPLT ELECTRICAL PWR WAS BEING INTERRUPTED FOR THE SECOND TIME ON APCH TO CRG, FL.
Narrative: ENRTE FROM ALMA VOR (AMG) TO CRAIG FIELD IN JACKSONVILLE, FL, THE AC690B TURBO COMMANDER I WAS FLYING HAD AN ELECTRICAL FAILURE. THE FAILURE WAS ON THE CTL BUS CIRCUITRY. I PUSHED THE TIE BREAKER (SUB-PANEL) IN. THIS TIE HELD FOR 5 MINS, THEN POPPED. I RESET THE SUB-PANEL TIE BREAKER AND ALSO SET THE CTL TIE BREAKER SWITCH OVERHEAD. THIS HELD WITH ONLY POPPING TWICE. ONCE ON DSCNT INTO JACKSONVILLE, THE SECOND TIME WHILE SHOOTING THE ILS RWY 32 APCH INTO CRAIG. I HAD INTERCEPTED THE LOC INBOUND (AFTER RADAR VECTORING) AT 1900 FT MSL. I WAS DSNDED DOWN TO 1400 FT AGL AND WAS DIRECTED TO TRACK THE LOC INBOUND AND CONTACT CRAIG TWR. I WAS FLYING ON AUTOPLT WHEN THE CTL CIRCUIT TRIPPED, TURNING OFF THE AUTOPLT. AS I LEANED OVER TO RESET BREAKERS, THE ACFT DSNDED DOWN FROM 1400 FT AGL TO 900 FT AGL, SETTING OFF AN ALT ALERT IN THE TWR. I ADVISED TWR OF AUTOPLT FAILURE AS I WAS CLBING TO INTERCEPT THE GS. WE LANDED WITHOUT INCIDENT. WE WERE IN VFR CONDITIONS AT 1400 FT AGL WITH 10 MI VISIBILITY. HINDSIGHT: SHOULD HAVE HAND FLOWN TO LAND AND RESET THE CTL CIRCUIT AFTER CLRING RWY IN ORDER TO SHUT DOWN.
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.