Erroneous total air temperature and sat readings, due to tape on rosemont probe.

Attributes
ACN	429760
Time
Date	199902
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : yvr.airport
State Reference	BC
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Flight Phase	ground : parked
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain
Qualification	pilot : atp
ASRS Report	429760
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe maintenance problem : improper maintenance
Independent Detector	other flight crewa other flight crewb other other : 3
Resolutory Action	none taken : detected after the fact
Factors
Maintenance	performance deficiency : repair
Supplementary
Problem Areas	Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

Tape covering total air temperature/sat probe. Location: yvr. Total air temperature and sat were both reading 12 degrees higher than actual outside air temperature. Maintenance found tape around stem of rosemont probe which blocked numerous small holes resulting in erroneous temperature reading. Tape was very difficult to see due to its similar color as probe and proximity on airplane. Conspicuously colored tape used on aircraft might help make taped openings more noticeable and insure removal.

Original NASA ASRS Text

Title: ERRONEOUS TOTAL AIR TEMP AND SAT READINGS, DUE TO TAPE ON ROSEMONT PROBE.

Narrative: TAPE COVERING TOTAL AIR TEMP/SAT PROBE. LOCATION: YVR. TOTAL AIR TEMP AND SAT WERE BOTH READING 12 DEGS HIGHER THAN ACTUAL OUTSIDE AIR TEMP. MAINT FOUND TAPE AROUND STEM OF ROSEMONT PROBE WHICH BLOCKED NUMEROUS SMALL HOLES RESULTING IN ERRONEOUS TEMP READING. TAPE WAS VERY DIFFICULT TO SEE DUE TO ITS SIMILAR COLOR AS PROBE AND PROX ON AIRPLANE. CONSPICUOUSLY COLORED TAPE USED ON ACFT MIGHT HELP MAKE TAPED OPENINGS MORE NOTICEABLE AND INSURE REMOVAL.

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.