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Corp aircraft has aircraft equipment problem. One altimeter indicating climb, the other indicating a descent.
| Attributes | |
| ACN | 225957 |
| Time | |
| Date | 199211 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : roa |
| State Reference | VA |
| Altitude | msl bound lower : 4700 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : roa |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport |
| Flight Phase | descent other |
| Route In Use | enroute airway : roa |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 7000 flight time type : 3000 |
| ASRS Report | 225959 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Trip from bna to roa, 2 crew, 4 passengers. Approach cleared small transport to 5000 ft MSL positioning for the roa ILS 33. Upon reaching 5000 ft MSL power added to arrest descent. Capts altimeter continued descent approximately 1000 FPM. (Copilot in left seat performing duties of PIC) at 4800 ft copilot informs me that the aircraft is in a non-controled descent. I take command, add climb power, inform approach that we have a problem and are sorting it out. Approach issues a low altitude alert to us. I switch to backup altitude and transponder. I have #1 altimeter saying descent and #2 saying assent. I inform approach I believe the aircraft is climbing, they report descending. I climb to 11000 ft 'blue sky' to verify climb. The #2 altimeter uses #1 altimeter encoder for reporting. Condition stabilizes. I repos for the approach with no further problems. Note -- plan to have second encoding system installed.
Original NASA ASRS Text
Title: CORP ACFT HAS ACFT EQUIP PROBLEM. ONE ALTIMETER INDICATING CLB, THE OTHER INDICATING A DSCNT.
Narrative: TRIP FROM BNA TO ROA, 2 CREW, 4 PAXS. APCH CLRED SMT TO 5000 FT MSL POSITIONING FOR THE ROA ILS 33. UPON REACHING 5000 FT MSL PWR ADDED TO ARREST DSCNT. CAPTS ALTIMETER CONTINUED DSCNT APPROX 1000 FPM. (COPLT IN L SEAT PERFORMING DUTIES OF PIC) AT 4800 FT COPLT INFORMS ME THAT THE ACFT IS IN A NON-CTLED DSCNT. I TAKE COMMAND, ADD CLB PWR, INFORM APCH THAT WE HAVE A PROBLEM AND ARE SORTING IT OUT. APCH ISSUES A LOW ALT ALERT TO US. I SWITCH TO BACKUP ALT AND TRANSPONDER. I HAVE #1 ALTIMETER SAYING DSCNT AND #2 SAYING ASSENT. I INFORM APCH I BELIEVE THE ACFT IS CLBING, THEY RPT DSNDING. I CLB TO 11000 FT 'BLUE SKY' TO VERIFY CLB. THE #2 ALTIMETER USES #1 ALTIMETER ENCODER FOR RPTING. CONDITION STABILIZES. I REPOS FOR THE APCH WITH NO FURTHER PROBLEMS. NOTE -- PLAN TO HAVE SECOND ENCODING SYS INSTALLED.
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.