Incident at FREDERICTON INTERNATIONAL AIRPORT (Flight instrument failure)

Summary

2001-04-20: TSB Update : A01A0035 C-GENG, a Cessna 414 aircraft was on an IFR flight from Fredericton to Halifax at 7,000 feet. C-FYKQ, a Piper PA-31 aircraft was on an IFR flight from Halifax to Fredericton at 6,000 feet. Traffic was passed when the two aircraft were approximately 8 NM apart and the aircraft passed showing 7,000 and 6,000 feet respectively on radar with one mile of lateral separation (the required separation was 1,000 feet or 5 miles). The pilot of C-GENG reported that he observed that C-FYKQ was actually slightly below him when they passed, he then checked the other altimeter and found that it was showing 6,000 feet, and after verifying that both altimeters were set to the correct barometric pressure setting, he tapped the glass of the primary altimeter and it spooled down to 6,000 feet. The pilot then queried QM ACC as to what altitude he was being displayed at and was advised that he was now being displayed at 6,000 feet. After arriving in Halifax, an avionics technician examined the altimeter (Aircraft Radio Company {ARC} Model EA-401A. P/N 42540-6128, S/N8584) and the related systems and could not find any faults, nor could the snag be duplicated on subsequent test flights. Another avionics company was consulted but they had never encountered the same problem either; they advised that from their experience this model altimeter has been problematic. This model altimeter is no longer being manufactured nor are replacement parts, for units already in service, being manufactured. The aircraft operator has order a replacement altimeter.
2001-04-18: CGENG C414 IFR ENROUTE FREDERICTON TO HALIFAX REPORTED LEVEL 7000 FT. CFYKQ PA31 IFR ENROUTE HALIFAX TO FREDERICTON LEVEL 6000 FT. Traffic passed when aircraft were approx. 8 NM apart. Aircraft passed at 1218Z showing 7000 and 6000 FT respectively on radar. Approximately 5 minutes later the pilot of C-GENG queried ATC as to what altitude was being displayed and at this time the mode C was showing 6000 FT and the pilot advised that he had actually passed under C-FYKQ. Moncton radar information indicated the aircraft were at there cleared altitudes. TSB Case Closed with more to follow.

Details


CADORS Number 2001A0214
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2001-04-17 - 12:18
Day or Night? Day-time
Fatalities 0
Injuries
Aerodrome ID CYFC
Aerodrome Name FREDERICTON INTERNATIONAL AIRPORT
Geographic Location New Brunswick, Canada, North America, Atlantic Region, 30 NM Southwest of Fredericton
TSB Occurrence Number A01A0035
TSB Class of Investigation Class 5
AOR Number 14828
Reported By NAV CANADA
Categories System/component failure or malfunction [non-powerplant]
Events Flight instrument failure


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