After receiving clearance, flight crew inserted it into the INS's, but failed to include an intermed...

Attributes
ACN	341420
Time
Date	199607
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sxc
State Reference	CA
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-8F
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute airway : zla
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 4800 flight time type : 800
ASRS Report	341420
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

The event in question probably began immediately after passing ficky intersection between hnl and ontario, ca. The original clearance was: once in radar contact with ZLA they issued a revised arrival clearance from ficky control routing 1177 sxc, direct ocn. Simultaneous with receipt of the new clearance, both pilots were involved with investigating a 5-6 mi difference between the #1 and #2 INS. The navigating INS was #2. The new clearance was read back to ZLA, and input into both INS's without including one intermediate point. The aircraft flew exactly what was put in INS. Aircraft was noted by ZLA diverging left of arrival routing course. Vectors to return to course were issued and the aircraft corrected to cleared course. Maximum deviation from assigned course was 7-9 mi. Route rechked, input and verified by both crew after correction. Error was probably a result of crew task saturation and attention diversion during a key communication point. We could probably have helped ourselves out two ways. Avoid sits where both pilots become involved with questionable data at the same time. Let one handle the problem while the other pilot maintains aircraft control. When in radar contact, using RNAV procedures, radar could have been our best help in resolving our actual position.

Original NASA ASRS Text

Title: AFTER RECEIVING CLRNC, FLC INSERTED IT INTO THE INS'S, BUT FAILED TO INCLUDE AN INTERMEDIATE POINT. ACFT FLEW RTE AS INSERTED UNTIL ATC INTERVENED TO ADVISE FLC THEY WERE OFF COURSE. CORRECTIVE ACTION FOLLOWED.

Narrative: THE EVENT IN QUESTION PROBABLY BEGAN IMMEDIATELY AFTER PASSING FICKY INTXN BTWN HNL AND ONTARIO, CA. THE ORIGINAL CLRNC WAS: ONCE IN RADAR CONTACT WITH ZLA THEY ISSUED A REVISED ARR CLRNC FROM FICKY CTL ROUTING 1177 SXC, DIRECT OCN. SIMULTANEOUS WITH RECEIPT OF THE NEW CLRNC, BOTH PLTS WERE INVOLVED WITH INVESTIGATING A 5-6 MI DIFFERENCE BTWN THE #1 AND #2 INS. THE NAVING INS WAS #2. THE NEW CLRNC WAS READ BACK TO ZLA, AND INPUT INTO BOTH INS'S WITHOUT INCLUDING ONE INTERMEDIATE POINT. THE ACFT FLEW EXACTLY WHAT WAS PUT IN INS. ACFT WAS NOTED BY ZLA DIVERGING L OF ARR ROUTING COURSE. VECTORS TO RETURN TO COURSE WERE ISSUED AND THE ACFT CORRECTED TO CLRED COURSE. MAX DEV FROM ASSIGNED COURSE WAS 7-9 MI. RTE RECHKED, INPUT AND VERIFIED BY BOTH CREW AFTER CORRECTION. ERROR WAS PROBABLY A RESULT OF CREW TASK SATURATION AND ATTN DIVERSION DURING A KEY COM POINT. WE COULD PROBABLY HAVE HELPED OURSELVES OUT TWO WAYS. AVOID SITS WHERE BOTH PLTS BECOME INVOLVED WITH QUESTIONABLE DATA AT THE SAME TIME. LET ONE HANDLE THE PROB WHILE THE OTHER PLT MAINTAINS ACFT CTL. WHEN IN RADAR CONTACT, USING RNAV PROCS, RADAR COULD HAVE BEEN OUR BEST HELP IN RESOLVING OUR ACTUAL POS.

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.

After receiving clearance, flight crew inserted it into the INS's, but failed to include an intermediate point. Aircraft flew route as inserted until ATC intervened to advise flight crew they were off course. Corrective action followed.