<< >> NASA ASRS Report 139742, March 1990

Track deviation.

Attributes
ACN	139742
Time
Date	199003
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : eau
State Reference	WI
Altitude	msl bound lower : 17000 msl bound upper : 17000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zmp
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 4950 flight time type : 800
ASRS Report	139742
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Scheduled for 7.8 hours flying and 12 hours on duty, in accordance with far 135. IMC all day and into 8TH hour. First officer PF. Departed eau clair on V78, which is 058 degree right from VOR. PF set in 078 on the obs. PNF did not notice. ARTCC alerted us to being 10 mi to right of arwy. I noticed full deflection on my CDI (which was correctly set to 058 degree right and not the arwy # V78), but it did not register in my mind. After ARTCC notification, I realized PF obs incorrectly set. It was then correctly set and PF returned aircraft to arwy. This was due to fatigue on part of both pilots. Being regularly scheduled for 7.8 hours of flying with 12 hour duty day and 9 legs makes it increasingly difficult to remain alert as the day wears on (especially in IMC).

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Original NASA ASRS Text

Title: TRACK DEVIATION.

Narrative: SCHEDULED FOR 7.8 HRS FLYING AND 12 HRS ON DUTY, IN ACCORDANCE WITH FAR 135. IMC ALL DAY AND INTO 8TH HOUR. F/O PF. DEPARTED EAU CLAIR ON V78, WHICH IS 058 DEG R FROM VOR. PF SET IN 078 ON THE OBS. PNF DID NOT NOTICE. ARTCC ALERTED US TO BEING 10 MI TO RIGHT OF ARWY. I NOTICED FULL DEFLECTION ON MY CDI (WHICH WAS CORRECTLY SET TO 058 DEG R AND NOT THE ARWY # V78), BUT IT DID NOT REGISTER IN MY MIND. AFTER ARTCC NOTIFICATION, I REALIZED PF OBS INCORRECTLY SET. IT WAS THEN CORRECTLY SET AND PF RETURNED ACFT TO ARWY. THIS WAS DUE TO FATIGUE ON PART OF BOTH PLTS. BEING REGULARLY SCHEDULED FOR 7.8 HRS OF FLYING WITH 12 HR DUTY DAY AND 9 LEGS MAKES IT INCREASINGLY DIFFICULT TO REMAIN ALERT AS THE DAY WEARS ON (ESPECIALLY IN IMC).

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.