<< >> NASA ASRS Report 225957, November 1992

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.

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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.