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Altitude deviation occurs when H25B flight crew follows faulty GS indicator. Received low altitude alert from ATC.
| Attributes | |
| ACN | 675819 |
| Time | |
| Date | 200510 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : pdk.airport |
| State Reference | GA |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a80.tracon |
| Operator | general aviation : corporate |
| Make Model Name | HS 125 Series |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 195 flight time total : 11551 flight time type : 1700 |
| ASRS Report | 675819 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : clearance non adherence : published procedure other anomaly other spatial deviation |
| Independent Detector | atc equipment : msaw other controllera |
| Resolutory Action | controller : issued alert flight crew : overcame equipment problem flight crew : became reoriented |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
Pdk; ILS runway 20L; cleared for approach. PIC (left seat) descended using GS indications. Approach control called altitude low alert; immediately climbed. Xchk of PIC/sic GS indicators -- PIC indicator faulty. No ATC required telephone calls upon landing. Discrepancy written up for repairs. Prevention: pdk ILS is known to have an unreliable ILS. However; good situational awareness and diligent xchking of all available GS indicators would have prevented this occurrence.
Original NASA ASRS Text
Title: ALTDEV OCCURS WHEN H25B FLT CREW FOLLOWS FAULTY GS INDICATOR. RECEIVED LOW ALT ALERT FROM ATC.
Narrative: PDK; ILS RWY 20L; CLRED FOR APCH. PIC (L SEAT) DSNDED USING GS INDICATIONS. APCH CTL CALLED ALT LOW ALERT; IMMEDIATELY CLBED. XCHK OF PIC/SIC GS INDICATORS -- PIC INDICATOR FAULTY. NO ATC REQUIRED TELEPHONE CALLS UPON LNDG. DISCREPANCY WRITTEN UP FOR REPAIRS. PREVENTION: PDK ILS IS KNOWN TO HAVE AN UNRELIABLE ILS. HOWEVER; GOOD SITUATIONAL AWARENESS AND DILIGENT XCHKING OF ALL AVAILABLE GS INDICATORS WOULD HAVE PREVENTED THIS OCCURRENCE.
Data retrieved from NASA's ASRS site as of January 2009 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.