<< >> NASA ASRS Report 344850, August 1996

Flight crew of an medium large transport failed to follow their clearance at the beginning of a STAR causing ATC to intervene and provide a vector to on course. The crew had misinterpreted their clearance and consequently programmed their FMC in error.

Attributes
ACN	344850
Time
Date	199608
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : oal
State Reference	NV
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 226 flight time total : 16890 flight time type : 1211
ASRS Report	344850
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance non adherence : published procedure 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:

Received a change in our routing from ATC upon request of our clearance at msp, due to WX. It was as follows: radar vectors fsd, J-114 onl, J-148 oal, direct hyp sjc. Northeast of onl we were given direct oal by ATC and we accepted. Approximately 100 mi east of oal, we understood ATC to say, 'we were cleared to sjc via direct oal, el nido, el nido 3 FL350. We took this to mean we were to proceed direct to el nido VOR from oal VOR. It was read back to ATC as such, 'clre D direct oal, el nido, el nido 3 arrival, FL350. It was inserted into the FMC. Shortly after passing oal, ZOA asked if we were on the oal transition. I told ATC we understood the clearance to be direct to el nido without the transition. ATC told us to turn 15 degrees left and to intercept the oal 216 degree radial, which we did and intercepted the radial shortly thereafter. We continued on the el nido 3 to sjc via the oal transition.

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Original NASA ASRS Text

Title: FLC OF AN MLG FAILED TO FOLLOW THEIR CLRNC AT THE BEGINNING OF A STAR CAUSING ATC TO INTERVENE AND PROVIDE A VECTOR TO ON COURSE. THE CREW HAD MISINTERPRETED THEIR CLRNC AND CONSEQUENTLY PROGRAMMED THEIR FMC IN ERROR.

Narrative: RECEIVED A CHANGE IN OUR ROUTING FROM ATC UPON REQUEST OF OUR CLRNC AT MSP, DUE TO WX. IT WAS AS FOLLOWS: RADAR VECTORS FSD, J-114 ONL, J-148 OAL, DIRECT HYP SJC. NE OF ONL WE WERE GIVEN DIRECT OAL BY ATC AND WE ACCEPTED. APPROX 100 MI E OF OAL, WE UNDERSTOOD ATC TO SAY, 'WE WERE CLRED TO SJC VIA DIRECT OAL, EL NIDO, EL NIDO 3 FL350. WE TOOK THIS TO MEAN WE WERE TO PROCEED DIRECT TO EL NIDO VOR FROM OAL VOR. IT WAS READ BACK TO ATC AS SUCH, 'CLRE D DIRECT OAL, EL NIDO, EL NIDO 3 ARR, FL350. IT WAS INSERTED INTO THE FMC. SHORTLY AFTER PASSING OAL, ZOA ASKED IF WE WERE ON THE OAL TRANSITION. I TOLD ATC WE UNDERSTOOD THE CLRNC TO BE DIRECT TO EL NIDO WITHOUT THE TRANSITION. ATC TOLD US TO TURN 15 DEGS L AND TO INTERCEPT THE OAL 216 DEG RADIAL, WHICH WE DID AND INTERCEPTED THE RADIAL SHORTLY THEREAFTER. WE CONTINUED ON THE EL NIDO 3 TO SJC VIA THE OAL TRANSITION.

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.